JP6447460B2 - Strainer equipment, slurry processing equipment - Google Patents

Description

  The present invention relates to a strainer device, and more specifically, a strainer device for slurry capable of efficiently separating and recovering coarse particles while preventing wear and the like due to coarse particles contained in the slurry, and the slurry device. Relates to a slurry processing facility.

  In general, as a preparatory stage for solid-liquid reaction in leaching processing, extraction processing, etc., an insoluble solid powder is repulped into a solvent such as water to prepare a slurry, and the slurry is fed to a solid-liquid reaction etc. facility Operations are taking place. Also, when transferring a solid powder, an operation is performed in which the insoluble solid powder is repulped into a solvent such as water to prepare a slurry, and the slurry is transferred by a feeding means such as a pump.

  In the slurry preparation stage, solid powder is put into a slurry tank such as a repulp tank from a bag, flexible container, can, or the like and mixed with a solvent by a stirrer or the like to form a slurry. Prepared.

  However, in the prepared slurry, the coarse material already present in the solid powder, the lump that is agglomerated in a container such as a bag, a flexible container, or a can in which the solid powder is enclosed, a stirrer, etc. Coarse particles such as uncrushed material that could not be crushed by mixing and stirring may be present.

  When such coarse particles are present in the slurry, the pump, piping, measuring instrument, etc. in the flow feeding equipment for feeding the slurry may be damaged or blocked due to wear. In addition, in a slurry containing coarse particles, a solid-liquid contact area cannot be obtained in a solid-liquid reaction or the like in the next step, which may cause a reaction failure.

  Therefore, in general, a collection container called a strainer is installed in the middle of the inflow equipment such as piping to collect and remove coarse particles in the slurry. Is done.

  Various types of strainers are used depending on the particle size of the solid powder, the size of the coarse particles to be recovered, the amount of the coarse particles, and the like. Generally, the T-type strainer, the Y-type strainer, and the bucket type are used. A strainer or the like is used.

  In a strainer, a wire mesh, a perforated plate, a gap plate, or the like is used as a member that constitutes a sieve portion that separates coarse particles. In addition, considering the corrosiveness of the solvent used and the wearability of the solid powder, the strainer is made of a metal material such as steel or stainless steel, vinyl chloride, polyethylene, fluororesin (depending on the properties of the target slurry). A resin material such as Teflon (registered trademark) is used.

  By the way, when the solid powder in the slurry is a hard and easy-to-wear material, for example, the wire such as a wire mesh which is a member constituting the strainer of the strainer may be cut and damaged. As a result, an opening larger than the opening of the wire mesh is opened. Then, the original purpose of collecting and removing the coarse particles cannot be achieved, and the coarse particles are allowed to pass through.Therefore, the coarse particles that have passed wear and damage the transport equipment such as pumps, piping, and measuring instruments. In other words, the flow equipment is blocked, or a reaction failure is caused in the next step such as solid-liquid reaction.

  In any type of strainer described above, it is necessary to discharge the collected material in a timely manner so as not to cause clogging of the members constituting the sieve portion. In addition, there is a demand for efficient operation without manpower.

  In order to solve such technical problems, strainers having various structures have been developed.

  For example, a strainer having a function of automatically discharging, as disclosed in Patent Document 1, for example, has been proposed for a problem related to the discharge of the collected material. However, the structure is complicated, and the installation cost and the maintenance cost are high.

  Further, in Patent Document 2, in order to simplify the structure of the strainer and reduce the apparatus cost, the filtration element is inserted and installed in the longitudinal direction inside the strainer body so as to be shifted from the position of the maximum diameter. Thus, a strainer that divides the inside of the main body into a primary side wide room and a secondary side narrow room is disclosed. In addition, the strainer disclosed in Patent Document 2 has a structure in which the cleaning water can be sent by a valve operation and the cleaned cleaning water can be discharged when the inside is cleaned.

  However, in order to clean and remove the collected matter adhering to the filtration element, it is necessary to remove the blind flange (lid) and extract the filtration element. Therefore, the strainer disclosed in Patent Document 2 has a problem that a large amount of washing water is required for discharging the collected material, the valve operation is troublesome, and the filtration element is troublesome and time-consuming.

  Furthermore, neither of the strainers of Patent Document 1 and Patent Document 2 mentions the problem that the members constituting the screen portion of the strainer are damaged by wear due to coarse particles in the slurry. Cannot be solved sufficiently.

  In this way, in the strainer for removing and recovering coarse particles from the slurry containing coarse particles, it is possible to prevent damage due to wear of the members constituting the sieve portion and efficiently collect the recovered material in a short time without manpower. There is a demand for a strainer that can discharge the wastewater.

JP 2014-42862 A Japanese Patent Laid-Open No. 10-15315

  The present invention has been proposed in view of such circumstances, and in a strainer device that separates and collects coarse particles in a slurry prepared by repulping an insoluble solid powder with a solvent, the coarse particles contained in the slurry are used. An object of the present invention is to provide a strainer device for slurry capable of efficiently separating and collecting coarse particles while preventing wear.

  The inventors of the present invention have made extensive studies in order to solve the above-described problems. As a result, a preliminary classification box is attached to the strainer main body, and the slurry containing coarse particles is once charged in advance in the preliminary classification box, and then sent to the strainer main body by overflowing from the preliminary classification box. It has been found that coarse particles can be efficiently separated and recovered without wearing the sieve, and the present invention has been completed. That is, the present invention provides the following.

  (1) A first invention of the present invention is a strainer device having a non-sealed structure for collecting coarse particles contained in a slurry, which receives and stores the charged slurry, and the preliminary classification A strainer body provided adjacent to the box and having a sieve plate and an extraction portion having a slurry outlet, and the slurry overflowing from the preliminary classification box is over the sieve plate in the strainer body. The strainer device is characterized in that the coarse particles in the slurry are collected by the sieve plate.

  (2) The second invention of the present invention is the strainer device according to the first invention, wherein the sieve plate in the strainer body is a perforated plate.

  (3) The third invention of the present invention is the strainer device according to the first or second invention, wherein the sieve plate in the strainer body is provided so as to be inclined toward the flow direction of the slurry. It is.

  (4) A fourth invention of the present invention is the strainer device according to any one of the first to third inventions, wherein the sieve plate in the strainer body is removable.

  (5) A fifth invention of the present invention is a slurry processing facility in which a plurality of processing tanks are installed, and slurry containing coarse particles is sequentially transferred to the plurality of processing tanks to perform processing on the slurry. The plurality of treatment tanks are installed in series with respect to the transfer direction of the slurry, and a strainer device for recovering coarse particles contained in the slurry is provided in a front stage of each of the plurality of treatment tanks. The strainer device has a non-sealing structure, and is provided adjacent to the preliminary classification box that receives and stores the charged slurry, and includes a sieve plate and a slurry outlet. A strainer body having an extraction portion, and the slurry overflowing from the preliminary classification box flows over the sieve plate in the strainer body, and the coarse particles in the slurry A slurry processing equipment, characterized in that it is recovered by the sieve plate.

  (6) According to a sixth aspect of the present invention, in the fifth aspect, in the strainer device provided in the preceding stage of each of the plurality of treatment tanks, the plurality of the plurality of the plurality of slurry heading from upstream to downstream in the slurry transfer direction. The slurry processing equipment is configured such that the openings of the sieve plates in the strainer body become smaller in the order of the processing tank arrangement.

  According to the present invention, coarse particles can be efficiently separated and recovered while preventing wear due to the coarse particles contained in the slurry.

  Thereby, the generation | occurrence | production of the problem that the opening of a sieve becomes large by damage can be prevented, and the slurry which isolate | separated and removed the coarse particle effectively can be transferred as a slurry transferred to various processing tanks.

It is process drawing which showed the flow of the process with respect to MS (nickel * cobalt mixed sulfide) which is a manufacturing raw material of nickel sulfate. It is an external appearance perspective view which shows an example of a structure of a strainer apparatus. It is a side view which shows an example of a structure of a strainer apparatus. It is a top view which shows an example of a structure of a strainer apparatus. It is a figure which shows only the surrounding part of the sieve board in a strainer main body. It is sectional drawing of a strainer apparatus, and is a figure for demonstrating the flow until it extracts the slurry which isolate | separated and removed the coarse particle from charging of a slurry. It is a block diagram which shows an example of a structure of a slurry processing equipment.

  Hereinafter, a specific embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment, A various change is possible in the range which does not change the summary of this invention.

<< 1. Strainer device >>
The strainer device according to the present embodiment is a device for separating and recovering coarse particles such as a large product or a lump produced by agglomeration from a slurry containing solid particles, and is a strainer device for slurry. It is. The strainer device according to the present embodiment is called an upper open type, and is distinguished from a strainer device that performs a classification operation under a predetermined pressure while using a pressure pump or the like as a device having a sealed structure, It can be said that it is constituted by an unsealed structure.

  As described above, the strainer device collects and removes coarse particles in a slurry prepared by repulping an insoluble solid powder in a solvent such as water, and is applied to any process equipment that transfers the slurry. Can do. For example, the present invention can be applied to facilities for processing nickel sulfate production raw materials. Hereinafter, the processing of the raw material for producing nickel sulfate will be described as an example, and an outline of an application example of the strainer device will be described.

<1-1. Example of process in which strainer device is applied to equipment>
In the manufacturing process of nickel sulfate, a mixed sulfide (Mixed Sulfide, hereinafter also referred to as “MS”) containing nickel and cobalt is used as a raw material. This MS performs high pressure acid leaching (HPAL) on nickel oxide ore of low nickel grade and removes impurities such as iron from the obtained pressurized acid leaching solution. It is obtained by causing a sulfurization reaction by blowing hydrogen gas into the leachate, and is mainly composed of a sulfide such as NiS.

  FIG. 1 is a process diagram showing the flow of processing for MS, which is a raw material for producing nickel sulfate. As shown in FIG. 1, first, MS is repulped with water and a high-concentration nickel thin liquid in a repulping tank (repulping step). Next, the slurry obtained by the repulping process is transferred to a pressure reaction tank such as an autoclave and subjected to a pressure leaching process, and nickel and cobalt in the MS are leached with high-pressure air (pressure leaching process). . Thereafter, a pressure reduction process is performed on the high-pressure leachate using a flash vessel or the like (pressure reduction process), and the temperature is lowered to about room temperature (cooling process). After passing through these steps, the pressurized leachate is transferred to a Fe removal step or the like. The pressure leaching solution is a mixed aqueous solution of nickel sulfate and cobalt sulfate.

  Here, in the above-described repulping process, MS, which is a solid powder and insoluble in a solvent such as water, is charged into a repulp tank, and a slurry is prepared by mixing and stirring with a stirrer. MS, which is a solid powder, may be mixed with flaky scale (hereinafter referred to as “scale”) generated in the manufacturing process, and is packed in a flexible container or the like with such scale mixed. . Therefore, when putting MS into the repulp tank from the flexible container, flaky scale pieces are also put together, and as a result, the scale pieces are also included in the slurry.

  However, when coarse particles such as scales are present in the slurry, the coarse particles cause damage to the transport equipment such as pumps, piping, and measuring instruments for transferring the slurry due to wear. Or may be occluded.

  Therefore, in the present embodiment, when transferring the slurry containing coarse particles such as scales, a strainer device is installed at a predetermined position of the piping in the process facility, and the coarse particles contained in the slurry are separated and collected. . Hereinafter, the strainer apparatus installed in the piping of such process equipment will be specifically described.

<1-2. Configuration of strainer device>
As described above, the strainer device according to the present embodiment is an upper open type strainer device that collects coarse particles contained in a slurry. FIG. 2 is an external perspective view showing an example of the configuration of the strainer device according to the present embodiment. This strainer device is indicated as “strainer device 1”. FIG. 3 is a side view of the strainer device 1, and FIG. 4 is a top view of the strainer device 1.

  Specifically, as shown in FIGS. 2 to 4, the strainer device 1 according to the present embodiment includes a preliminary classification box 11 and a strainer body 12 adjacent to the preliminary classification box 11.

(1) Pre-classification box The pre-classification box 11 is a box part in which a slurry that is a target for collecting coarse particles is charged and temporarily stored. The preliminary classification box 11 is provided adjacent to a strainer body 12 described later, and receives and stores a target slurry in advance prior to classification by sieving of coarse particles in the strainer body 12.

  In the strainer device 1, the preliminary classification box 11 is provided as described above, and the slurry that is a processing target including coarse particles is first supplied to the preliminary classification box 11. In the preliminary classification box 11, after storing a predetermined amount of slurry, the slurry overflowing (overflowing) the preliminary classification box 11 is gradually sent to the strainer body 12.

  In such a strainer device 1, the slurry containing coarse particles is previously charged in the preliminary classification box 11, and then the slurry is overflowed from the preliminary classification box 11 and is sent to the strainer body 12. A certain proportion of the coarse particles contained in the slurry is deposited and separated at the bottom of the preliminary classification box 11. Therefore, the slurry from which a certain amount of coarse particles are separated and removed flows to the strainer main body 12, so that the classification load of the coarse particles in the strainer main body 12 can be suppressed.

  Moreover, when the slurry containing coarse particles is directly charged toward the sieve plate (classifying member) in the strainer body, the sieve plate is easily damaged by the impact at the time of loading, but in this respect the strainer device 1, since the slurry is once charged in the preliminary classification box 11 in advance, it is possible to avoid direct slurry loading on the sieve plate 21. Moreover, since the slurry is supplied to the sieve plate 21 of the strainer body 12 so that the slurry overflows from the preliminary classification box 11 and flows on the sieve plate 21, the charging pressure to the sieve plate 21 is extremely high. The damage to the sieve plate 21 can be prevented more effectively.

  In the pre-classification box 11, coarse particles contained in the slurry are gradually deposited on the bottom thereof, so that the inside of the pre-classification box 11 is protected by the accumulated coarse particles. Therefore, even if the slurry is sequentially charged into the pre-classification box 11, wear damage due to the coarse particles in the slurry in the pre-classification box 11 is suppressed by the accumulated coarse particles themselves.

  The shape of the preliminary classification box 11 is not particularly limited, and for example, it can be a rectangular parallelepiped shape as shown in FIGS. Moreover, a cylindrical shape may be sufficient. Further, the depth and volume of the pre-classification box 11 are not particularly limited, and it is preferable to appropriately adjust according to the flow rate of the slurry flowing through the plant equipment.

  The preliminary classification box 11 can be configured to be integrated with a strainer body 12 described later. For example, the configuration examples shown in FIGS. 2 to 4 show a configuration in which the preliminary classification box 11 is formed integrally with the strainer body 12. Such an integrated configuration is preferable because the overall structure is simple and reasonable, and the manufacturing is easy.

  Here, when the preliminary classification box 11 and the strainer main body 12 are integrated, the plate 13 rising vertically from the bottom of the preliminary classification box 11 overflows the slurry stored in the preliminary classification box 11. It acts as a so-called overflow plate (hereinafter also referred to as “overflow plate 13”) for transferring to the strainer body 12. That is, of the slurry received and stored in the preliminary classification box 11, the slurry exceeding the overflow plate 13 is sent to the strainer body 12 to collect coarse particles.

  As a modified example, the preliminary classification box 11 may be separated from the strainer body 12 and may be configured separately. Although the configuration of the modified example is not illustrated, for convenience, the same configuration is described with the same reference numeral.

  Specifically, for example, the strainer device 1 in which a preliminary classification box 11 having a rectangular parallelepiped shape and a box constituting a strainer body 12 described later are physically separated from each other can be used. Even in the case of such a strainer device 1, the slurry is charged in the preliminary classification box 11 in advance, and then the slurry overflows the preliminary classification box 11 and is sent to the strainer body 12. At this time, for example, an overflow flow path such as a basket is provided on the upper side surface of the rectangular parallelepiped preliminary classification box 11, and the other end of the overflow flow path is connected to the surface of the sieve plate 21 of the strainer body 12. . As a result, when the slurry previously charged and stored in the preliminary classification box 11 overflows from the preliminary classification box 11, it flows through the overflow flow path and is sent to the strainer body 12.

(2) Strainer body The strainer body 12 is provided adjacent to the preliminary classification box 11, and sifts coarse particles from the slurry overflowing from the preliminary classification box 11, and collects the coarse particles. Specifically, the strainer body 12 includes a sieve plate 21 and an extraction portion 22 having a slurry extraction port 23.

[Sieving plate]
The sieve plate 21 is a member for separating and collecting coarse particles contained in the slurry by sieving. In the sieve plate 21, the slurry overflowing from the pre-classification box 11 flows on the surface, and coarse particles are separated according to the opening of the surface of the sieve plate 21.

  For example, when the sieve plate 21 has an aperture of 2.0 mm, the slurry overflowed from the pre-classification box 11 flows on the surface, so that the solid powder having a particle size of 2.0 mm or less together with the liquid component is contained in the sieve plate 21. The coarse solid powder (coarse particles) having a particle size exceeding 2.0 mm remains on the surface of the sieve plate 21. Thereby, coarse particles of a predetermined size can be separated from the slurry and recovered.

  As described above, in the strainer device 1, the slurry containing coarse particles is once charged and stored in the preliminary classification box 11 in advance, and then the slurry overflowing from the preliminary classification box 11 is the sieve plate 21 of the strainer body 12. Will be sent to. In the pre-classification box 11 for storing the slurry, since some of the coarse particles contained in the slurry are separated by being deposited, the amount of coarse particles that are sent to and contact the sieve plate 21 is reduced. Thereby, the classification | category load of the coarse particle in the sieve board 21 can be suppressed, and the damage by abrasion can be suppressed.

  In addition, since the slurry is not directly charged into the sieve plate 21, the slurry is charged at a low charging pressure without causing an impact or the like when the slurry is charged, and the sieve plate 21 overflows. Since the slurry is fed and flows on the surface thereof, damage due to wear of coarse particles on the sieve plate 21 can be more effectively suppressed.

  Although it does not specifically limit as the sieve board 21, For example, it can comprise with a wire mesh, a perforated board, a gap | interval board, etc. Among them, it is preferable to use a perforated plate such as a punching plate in that there is no element wire as in a wire mesh or the like, and cutting due to wear is difficult to occur.

  Specifically, when a perforated plate such as a punching plate is used as the sieve plate 21, the shape and arrangement of the holes are not particularly limited. For example, the shape of the hole may be various shapes such as a circle, a quadrangle, and a slit-like rectangle.

  Moreover, about the arrangement | positioning of the hole in a perforated plate, all the holes of the same shape and a size can be arrange | positioned densely and equally on the surface of a perforated plate. Further, the size of the holes may be changed in accordance with the flow direction of the slurry (the direction away from the adjacent pre-classification box 11). For example, by changing the size of the hole so that the size of the hole increases from the upstream side to the downstream side, or conversely, the size of the hole decreases from the upstream side to the downstream side. Also good. Thus, by making the upstream hole smaller than the downstream hole, the flow rate of the slurry passing through the sieve plate 21 can be made uniform, and conversely, the upstream hole is made smaller than the downstream hole. Also, the load caused by the coarse particles on the sieve plate 21 can be made uniform.

  In addition, the size of the holes can be appropriately adjusted according to the size of coarse particles that are desired to be separated and recovered from the slurry in the sieve plate 21.

  As shown in the configuration example of FIG. 2, the sieve plate 21 is preferably provided to be inclined so as to be lowered in the slurry flow direction. Thus, by tilting the sieve plate 21 downward in the slurry flow direction, coarse particles captured by the sieve plate 21 along the slurry flowing through the inclined sieve plate 21 are inclined low. It can be easily collected at the location. Specifically, as shown in the top view of FIG. 4, coarse particles in the slurry are placed on the downstream side in the flow direction of the slurry and at a low position (X portion in FIG. 4) of the inclined sieve plate 21. It can be collected efficiently and the recovery operation of the coarse particles is facilitated. Further, by inclining the sieve plate 21 in this way, it is possible to prevent the entire surface of the sieve plate 21 made of the perforated plate or the like from being uniformly blocked.

  Moreover, the sieve plate 21 is inclined so as to be lowered in the slurry flow direction, so that a smoother flow can be imparted to the slurry overflowed from the preliminary classification box 11 and sent. it can. That is, by using the sieve plate 21 provided at an inclination rather than the horizontally provided sieve plate 21, the slurry can flow on the sieve plate 21 without stopping the overflowing slurry flow. Moreover, the separation effect by sieving coarse particles can be enhanced.

  The sieve plate 21 can be detachable from the strainer body 12. FIG. 5 is a view showing only the peripheral portion of the sieve plate 21 in the strainer body 12. As specifically shown in FIG. 5, a handle 30 can be provided on the surface of the sieve plate 21 so that the sieve plate 21 can be easily detached and attached from the strainer body 12. In addition, when removing the sieve plate 21 from the strainer body 12, the operator can easily remove it by holding the handle 30 and lifting it upward as it is.

  Thus, by making the sieve plate 21 detachable, coarse particles are deposited on a predetermined portion of the sieve plate 21 (for example, portion X in FIG. 4), or clogging with coarse particles starts to occur on the sieve. In this case, only the sieve plate 21 can be removed from the strainer body 12, and the cleaning process or the like can be easily performed. And as mentioned above, by providing the handle 30 on the surface of the sieve plate 21, the washing and removing operation of the coarse particles can be easily completed in a short time. Further, by adopting the detachable type in this way, a spare part of the sieve plate 21 can be prepared, and the replacement work of the sieve plate 21 can be completed instantly.

[Extraction part]
The extraction portion 22 has a configuration other than the above-described sieve plate 21 in the strainer main body 12. The coarse particles are separated by the sieve plate 21, and is composed of a solid powder and a liquid component that have passed through the sieve mesh of the sieve plate 21. Pull out the slurry. This extraction part 22 has a slurry extraction outlet 23 for extracting the slurry and sending it to another processing tank via a pipe or the like.

  In the extraction part 22, the slurry that has passed through the sieve plate 21 is accommodated in a container part 22 </ b> A that constitutes the extraction part 22, and the slurry is discharged to the outside via a slurry outlet 23 provided at the bottom of the container part 22 </ b> A. Pull out. The slurry outlet 23 may be provided with a valve or the like to adjust the amount of the slurry extracted to the outside.

  Although it does not specifically limit as a shape of 22 A of container parts which comprise the extraction part 22, It is preferable that it is cone shape toward the downward direction so that a structural example may be shown in FIG.2 and FIG.3. . In addition, the slurry outlet 23 is provided in the edge part of 22 A of container parts which became cone shape.

  As the slurry outlet 23 constituting the extraction portion 22, the slurry after sieving with the sieve plate 21 is extracted and transferred by a predetermined method such as flowing down to a processing apparatus provided at the subsequent stage of the strainer device 1. If possible, the configuration is not particularly limited. For example, as described above, a valve may be provided, or a nozzle type that can adjust not only the flow rate of the slurry but also the direction of the flow-down direction or the like may be used.

<1-3. Summary of the strainer device configuration and effects>
As described above in detail, the strainer device 1 according to the present embodiment is of an upper open type and is adjacent to the preliminary classification box 11 that receives and stores the charged slurry, and the preliminary classification box 11. And a strainer body 12 having a sieve plate 21 and an extraction portion 22 having a slurry outlet 23.

  FIG. 6 is a cross-sectional view of the strainer device 1 and is a diagram for explaining the flow from the loading of the slurry to the extraction of the slurry from which coarse particles have been separated and removed. In addition, although the strainer apparatus 1 of FIG. 6 is provided with the ceiling part 40 in the upper part, it is not what is set as the sealed structure of performing pressure control by making the inside of an apparatus into a sealed state, This ceiling part 40 is only other equipment. In this embodiment, it is also referred to as an upper open type strainer device constituted by a non-sealing structure.

  As shown in FIG. 6, in the strainer device 1, a slurry containing coarse particles is charged from a slurry charging port 41 installed in the ceiling 40, and is temporarily stored in the preliminary classification box 11 in advance. In this way, when the slurry is charged and stored in the preliminary classification box 11 in advance, a part of coarse particles contained in the slurry is separated and deposited in the preliminary classification box 11.

  Subsequently, in the preliminary classification box 11, when the slurry exceeding the storage capacity of the preliminary classification box 11 is charged by the sequential slurry charging from the slurry charging inlet 41, the stored slurry is stored in the preliminary classification box. 11 overflows from the overflow plate 13 that separates the strainer body 12 and flows on the surface of the sieve plate 21 of the strainer body 12.

  For example, the sieve plate 21 is inclined so as to descend in the slurry flow direction, and coarse particles are separated as the slurry flows on the sieve plate 21. Along with that, the slurry from which the coarse particles have been separated passes through the sieve plate 21 and is sent to the extraction portion 22 located at the lower portion of the strainer body 12. The slurry stored in the extraction part 22 at the lower part of the strainer body 12 is then extracted via the slurry outlet 23. It should be noted that a transfer pipe for transferring the slurry to the treatment tank can be connected to the outlet 23.

  Thus, according to the strainer apparatus 1, since the slurry containing coarse particles is charged in the preliminary classification box 11 in advance and then fed to the strainer body 12, a certain amount of coarse particles contained in the slurry is obtained. The proportions can be deposited and separated at the bottom of the pre-classification box 11. Then, since the slurry from which a certain amount of coarse particles have been separated and flowed to the strainer main body 12, the classification load of the coarse particles in the strainer main body 12 can be suppressed, and the coarse particles in the sieve plate 21 can be suppressed. Damage due to wear can be suppressed.

  Thereby, generation | occurrence | production of the problem that the opening on the sieve board 21 becomes large by damage can be prevented, and the slurry which isolate | separated and removed the coarse particle effectively can be transferred as a slurry transferred to various processing tanks. . Therefore, the slurry in which coarse particles remain, as in the conventional case, damages the flow equipment such as pumps, pipes, measuring instruments, etc., blocks the flow equipment, or causes a reaction failure in the next process. It is possible to prevent such problems.

  In addition, the sieve plate 21 in the strainer main body 12 is detachable and detachable. For example, by providing a handle 30 on the surface, the attaching and detaching operation is facilitated to easily wash coarse particles deposited on the sieve plate 21. Can be removed.

<1-4. Modification of strainer device>
As a modification of the strainer device 1, for example, two preliminary classification boxes 11 (referred to as “preliminary classification box 11A and preliminary classification box 11B” for convenience of description) are arranged symmetrically on both sides of the strainer body 12, The slurry can be divided into two parts. The strainer device of this modification is referred to as “strainer device 1 ′” for convenience, and the other components will be described with the same reference numerals.

  In such a strainer apparatus 1 ′, the slurry is charged and stored in each of the pre-classification box 11 </ b> A and the pre-classification box 11 </ b> B, and then the slurry overflowing from each is sent to the strainer body 12.

  At this time, as the structure of the strainer main body 12, the shape of the sieve plate 21 constituting the strainer main body 12 is V-shaped, and the preliminary classification box 11A and the pre-classification box 11B which are arranged on both sides of the strainer main body 12 in contrast. The slurry overflowing from the flow is made to flow toward the central portion of the V-shaped sieve plate 21, that is, the lowermost portion. The coarse particles captured by the sieve plate 21 with the slurry flow are collected in the vicinity of the bottom of the V shape.

  By using the strainer device 1 as described above, the amount of slurry charged, that is, the processing amount of so-called coarse particles can be increased, and the operation efficiency can be increased.

≪2. Slurry processing equipment >>
Next, the slurry processing equipment provided with the strainer apparatus 1 mentioned above is demonstrated. This slurry processing equipment supplies a slurry prepared by repulping solid powder in a solvent to a processing tank that performs various reactions, and sequentially transfers it to a plurality of processing tanks to perform various processing on the slurry. It is equipment for applying.

  For example, as described above, MS used as a raw material for producing nickel sulfate becomes slurry by being subjected to a repulping process in a repulp tank. The produced slurry is circulated again to the repulp tank through the circulation pipe (self-circulation pipe), and the amount of slurry is increased by supplying new MS. Next, the slurry containing the MS (hereinafter referred to as “MS slurry”) is transferred to the MS slurry storage tank that stores the MS slurry through a pipe connected to the discharge port of the repulp tank, and is stored in the MS slurry storage tank. Thus, the stock and composition of the slurry can be made uniform. In the MS slurry storage tank, the liquid conditions and the like of the MS slurry may be adjusted as appropriate. Next, the MS slurry passes through a pipe connected to the discharge port of the MS slurry storage tank, is transferred to a pressure leaching start liquid tank that stores the pressure leaching start liquid, and is subjected to a pressure leaching process. Is stored in the pressurized leaching starting liquid tank. Thereafter, the MS slurry stored in the pressurized reaction starter tank is transferred to the pressurized leaching reaction tank.

  As shown in this specific example, the slurry processing facility has various processing tanks installed in series, and various processing tanks in which slurry containing solid powder (in the above-described specific example, MS slurry) is arranged in series. Are sequentially transferred and processed. In such a slurry processing facility, the slurry containing the solid powder is transferred from the processing tank to the next processing tank through a pipe (pipe facility) equipped with a pump, a measuring device, and the like. Therefore, when coarse particles are contained in the slurry, the piping equipment may be worn and damaged due to the coarse particles. Moreover, in the slurry containing coarse particles, the contact area with the chemical | medical agent added in a processing tank and slurries may reduce, and reaction efficiency may fall.

  Therefore, in such a slurry processing facility, a strainer for separating, recovering and removing coarse particles contained in the slurry before the various processing tanks, that is, before the slurry is charged into the respective processing tanks. It is preferable to provide an apparatus. Note that the term “treatment tank” is not limited to the meaning of a tank that serves as a reaction field that causes various treatment reactions to the slurry. Meaning of tanks for adjusting sex conditions, tanks for temporarily storing slurry such as storage tanks, tanks for relaying to transfer slurry such as relay tanks to another layer, etc. Is included.

  FIG. 7 is a block diagram showing an example of the configuration of the slurry processing facility according to the present embodiment. As shown in FIG. 7, the slurry processing facility 5 includes a plurality of processing tanks 51 (51A, 51B, 51C), and sequentially transfers slurry containing coarse particles to the plurality of processing tanks 51 to perform processing on the slurry. It is equipment for. Taking the MS slurry processing facility described above as an example, the processing tank 51A can be applied as a repulping tank, the processing tank 51B as an MS slurry storage tank, and the processing tank 51C as a pressurized leaching start liquid tank. Here, when the processing tank 51A is a repulp tank, a so-called self-circulating form in which the slurry of the processing tank 51A is supplied to the strainer device 1A is adopted.

  In addition, although the structure example shown in FIG. 7 has shown the structure which arranged three process tank 51A, 51B, 51C in series, the process tank 51 is not restricted to three. Moreover, the arrow in FIG. 7 shows the transfer direction of the slurry.

  Specifically, in the slurry treatment facility 5, a plurality of treatment tanks 51A, 51B, and 51C are installed in series with respect to the slurry transfer direction, and are disposed upstream of each of the treatment tanks 51A, 51B, and 51C. Is provided with a strainer device 1 (1A, 1B, 1C) for recovering coarse particles contained in the slurry.

  As described above, the strainer device 1 is an upper-open type device, and is provided adjacent to the preliminary classification box 11 that receives and stores the charged slurry, the sieve classification box 11, And a strainer body 12 having an extraction portion 22 having a slurry outlet 23. In the strainer device 1, the slurry overflowing from the pre-classification box 11 flows on the sieve plate 21 in the strainer body 12, and coarse particles in the slurry are separated and collected by the sieve plate 21. In addition, about the structure of the strainer apparatus 1, since it is the same as the content mentioned above, description here is abbreviate | omitted.

  In this way, in the slurry processing facility 5 in which the plurality of processing tanks 51 are provided in series, by providing the strainer device 1 at the front stage of each processing tank 51, the processing tank 51 is transferred through the piping of the slurry processing equipment 5. Coarse particles in the slurry can be reliably separated and removed, and a reduction in reaction efficiency in each treatment tank 51 can be prevented.

  Further, in the strainer devices 1A, 1B, and 1C provided in the previous stage of the plurality of treatment tanks 51A, 51B, and 51C, the order of the arrangement of the plurality of treatment tanks 51 from upstream to downstream in the slurry transfer direction, that is, The opening of the sieve plate 21 in the strainer body 12 may be reduced in the order of the processing tank 51A, the processing tank 51B, and the processing tank 51C.

  For example, the opening of the sieve plate 21 in the strainer device 1A provided in the front stage of the processing tank 51A is set to 3.0 mm, and the opening of the sieve plate 21 in the strainer device 1B provided in the front stage of the processing tank 51B is 2.0 mm. And the opening of the sieve plate 21 in the strainer device 1C provided in the front stage of the treatment tank 51C is 1.5 mm.

  As described above, in the slurry processing facility 5, the openings of the sieve plates 21 of the strainer device 1 provided in the preceding stage of each processing tank 51 in the order of the arrangement of the plurality of processing tanks 51 from upstream to downstream in the slurry transfer direction. By making the size smaller, coarse particles contained in the slurry can be separated and recovered more effectively. In particular, in the example of the MS slurry processing equipment described above, it is possible to reliably remove coarse particles in the slurry before applying the pressure leaching treatment to the MS slurry. It is possible to improve and stabilize the leaching rate and to operate stably.

  EXAMPLES Hereinafter, although the Example of this invention is shown and this invention is demonstrated more concretely, this invention is not limited to a following example at all.

[Example 1]
The strainer device 1 shown in FIG. 2 is installed at the return port of the self-circulation pipe of the repulp tank for repulping MS (nickel / cobalt mixed sulfide), which is a nickel sulfate production raw material, with water to prepare MS slurry Then, the coarse particles (scale pieces) contained in the MS slurry were collected and removed.

  Here, the composition (based on dry matter) of MS used as a raw material was 56 wt% to 59 wt% nickel, 3 wt% to 5 wt% cobalt, and 33 wt% to 36 wt% sulfur. The MS particle diameter was 70 μm to 100 μm in D50 (50% particle diameter based on the number). Such MS was filled in a flexible container, and its weight was about 2 t. The chemical composition of MS was measured by ICP emission spectroscopy, and the particle size of MS was measured by microtrack method.

And MS of two flexible containers is charged into a cylindrical repulp tank made of SUS304 with an effective volume of 20 m ³ and a height of 3.5 mφ, and a height of 2.2 m. To prepare a MS slurry having a concentration of 200 g / L.

  Specifically, as the strainer device 1, a preliminary classification box 11 that receives and stores the MS slurry to be charged, and an extraction that is provided adjacent to the preliminary classification box 11 and has a sieve plate 21 and a slurry outlet 23. The strainer main body 12 having the portion 22 is used. Note that a punching plate having a hole diameter of 3.0 mm was used as the sieve plate 21. Moreover, the punching plate which comprises the sieve plate 21 was detachable, and the handle 30 was provided so that it could be removed easily.

  With this strainer device 1, the MS slurry is charged in the preliminary classification box 11 in advance, and the slurry overflowed from the preliminary classification box 11 is caused to flow on the punching plate constituting the sieve plate 21 in the strainer body 12, and the punching plate The scales in the MS slurry were separated and recovered.

  As a result of the operation for about two months in the facility where the strainer device 1 was installed, the strainer device 1 was not damaged due to wear or the like due to wear.

  Further, the cleaning process of the punching plate constituting the sieve plate 21 was very simple, and the work time for removing the scales was only about 5 minutes. Furthermore, since a preliminary punching plate was prepared, the work time for the replacement operation was only about 1 minute.

  In addition, as a result of performing the pressure leaching process in the pressure leaching process on the MS slurry transferred through such a repulp tank, the leaching rate of nickel and cobalt from the MS is 98. It was 6% and was able to operate at a high leach rate.

[Example 2]
As Example 2, the strainer apparatus 1 similar to Example 1 was installed, and the scale contained in the MS slurry was collected and removed. In this Example 2, as shown in FIG. 7, in the equipment installed so that the repulp tank, the MS slurry storage tank, and the pressurized leaching start liquid tank are MS slurry processing equipment. The strainer apparatus 1 was installed in the front stage of each processing tank, and the operation of separating and removing the scales over three stages was performed as the MS slurry was transferred to the processing tank. However, only in the repulping tank, a so-called self-circulating form in which the slurry of the repulping tank is supplied to the strainer device 1 was adopted.

  Specifically, in this MS slurry processing facility, a strainer device 1 equipped with a punching plate having a hole diameter of 3.0 mm as a sieve plate is installed at the return port of the self-circulation piping of the repulp tank, and the slurry inlet of the MS slurry storage tank A strainer device 1 having a punching plate having a hole diameter of 2.0 mm as a sieve plate is installed, and a strainer device 1 having a punching plate having a hole diameter of 1.5 mm as a sieve plate at a slurry receiving port of the pressurized leaching start liquid tank. Was installed.

  As a result of operation for about half a year in such MS slurry processing equipment, no damage such as opening due to wear occurred in any of the sieves provided in the strainer apparatus 1.

  Further, the cleaning process of the punching plate constituting the sieve plate 21 was very simple, and the work time for removing the scales was only about 5 minutes. Furthermore, since a preliminary punching plate was prepared, the work time for the replacement operation was only about 1 minute.

  In addition, as a result of transferring MS slurry in such slurry processing equipment and then performing pressure leaching treatment in the pressure leaching step, the leaching rate of nickel and cobalt from the MS is 98.7 on an average per month. It was possible to operate at a high leaching rate. In addition, it improved from the leaching rate of the operation in Example 1.

[Comparative Example 1]
In Comparative Example 1, as in Example 1, the strainer device was installed at the return port of the self-circulation piping of the repulp tank for preparing the MS slurry, and the strainer device was equipped with a pre-classification box. A wire net consisting only of a strainer main body and having a sieve plate placed horizontally and having a strainer bottoming nozzle fixed under the sieve plate was used. The MS slurry was allowed to flow directly onto a wire mesh as a sieve plate. The other conditions were the same as in Example 1.

  As a result of the operation for about one year in the facility in which such a strainer device was installed, it was confirmed that the strainer device had openings due to wear. Specifically, as the frequency, holes were opened in the wire mesh once every 15 to 30 days, and the wire mesh replacement work requiring about 8 hours was forced.

  Further, it took about 30 minutes to remove the scale accumulated on the wire mesh.

  In addition, as a result of performing the pressure leaching process in the pressure leaching process on the MS slurry transferred through such a repulp tank, the leaching rate of nickel and cobalt from the MS is 98. It was 5%.

1, 1A, 1B, 1C Strainer device 5 Slurry processing equipment 11 Preliminary classification box 12 Strainer body 13 Overflow plate (plate)
21 sieving plate 22 extraction part 22A container part in extraction part 23 extraction outlet 30 handle 51, 51A, 51B, 51C processing tank

Claims (7)

A non-hermetic strainer device that collects coarse particles contained in a slurry,
A pre-classification box for receiving and storing the charged slurry;
A strainer body provided adjacent to the preliminary classification box and having a sieve plate and an extraction portion having a slurry extraction outlet;
The slurry overflowing from the preliminary classification box flows over the sieve plate in the strainer body, and coarse particles in the slurry remain on the surface of the sieve plate, whereby coarse particles are separated and recovered from the slurry ,
The strainer device is characterized in that the sieve plate in the strainer body is a detachable type in which a handle is provided on the surface so that it can be lifted up as it is and can be removed . The strainer device according to claim 1 , wherein the sieve plate in the strainer body is provided so as to be inclined toward the flow direction of the slurry. The strainer device according to claim 1 or 2 , wherein the sieve plate in the strainer body is a perforated plate. The strainer device according to claim 3, wherein the size of the holes of the perforated plate changes according to the flow direction of the slurry. Two pre-classification boxes are provided, the two pre-classification boxes are arranged in contrast on both sides of the strainer body, and the shape of the sieve plate constituting the strainer body is V-shaped.
The strainer apparatus as described in any one of Claims 1-4. A plurality of treatment tanks, a slurry treatment facility for sequentially transferring the slurry containing coarse particles to the plurality of treatment tanks and processing the slurry;
The plurality of treatment tanks are installed in series with respect to the transfer direction of the slurry,
A strainer device for recovering coarse particles contained in the slurry is provided at the front stage of each of the plurality of treatment tanks,
The strainer device has a non-sealing structure,
A pre-classification box for receiving and storing the charged slurry;
A strainer body provided adjacent to the preliminary classification box and having a sieve plate and an extraction portion having a slurry extraction outlet;
Slurry overflowing from the pre-classification box flows on the sieve plate in the strainer body, and coarse particles in the slurry remain on the surface of the sieve plate, whereby coarse particles are separated and recovered from the slurry. ,
A slurry processing facility , wherein the sieve plate in the strainer body is a detachable type in which a handle is provided on the surface so that the screen plate can be lifted up as it is and can be removed . In the strainer device provided in the previous stage of each of the plurality of treatment tanks,
The slurry processing equipment according to claim 6 , wherein the openings of the sieve plates in the strainer body are configured to be smaller in the order of the arrangement of the plurality of processing tanks from upstream to downstream in the slurry transfer direction.

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