JP6819415B2 - Reaction tank and stirring reactor - Google Patents

Description

The present invention relates to a reaction vessel and a stirring reaction device.

As a method for smelting nickel, cobalt, etc., there is a chlorine leaching electrowinning method (see Patent Document 1). When nickel is smelted by this method, the procedure is as follows.

First, a nickel mat containing nickel sulfide as a main component is crushed, and then this is dispersed in a chloride solution and chlorine gas is blown into the solution. Then, the valuable metal containing nickel is leached into the chloride solution, and a nickel leaching solution containing nickel is generated (chlorine leaching). When impurity elements such as cobalt and iron are removed from this nickel leachate, a nickel chloride solution is produced. Then, nickel electrolysis is produced by electrowinning the nickel chloride solution.

In such a chlorine leaching electrowinning method, there is a technique described in Patent Document 2 as a method for obtaining a high leaching rate of a valuable metal at the time of chlorine leaching. In the technique of Patent Document 2, the redox potential in the chlorine leaching tank (reaction tank) is measured at predetermined time cycles, and the opening degree of the chlorine flow rate control valve is adjusted by the difference between the set value and the measured value. .. Then, it is described that the width of the time fluctuation of the redox potential in the reaction vessel can be reduced, so that a high leaching rate of the metal element can be achieved.

Japanese Unexamined Patent Publication No. 2005-248245 Japanese Unexamined Patent Publication No. 2009-91646 Japanese Unexamined Patent Publication No. 9-29084

As described above, in the technique of Patent Document 2, the time fluctuation of the redox potential is maintained within a predetermined range, but in order to stably maintain the high leaching rate of the metal element, only the time fluctuation of the redox potential is maintained. However, it is necessary to reduce the spatial bias of the redox potential in the reaction vessel.

As a method of reducing the spatial bias of the redox potential in the reaction vessel, there is a method of stirring a liquid or the like in the reaction vessel, and as a general method of promoting stirring, there is a technique of using a baffle plate.

However, when a general baffle plate is used, the flow velocity of the liquid becomes slow at the connecting portion between the baffle plate and the wall surface of the reaction tank, and stagnation occurs. In the chlorine leaching step described above, the liquid may contain undissolved substances or solid substances such as so-called “dama”, and such solid substances may be deposited at the stagnation portion. If the amount of sediment is small, the equipment can continue to operate, but if a large amount of sediment is generated, the equipment must be shut down to remove the sediment. Then, there arises a problem that the productivity of nickel and the like is lowered.

On the other hand, if a baffle plate as in Patent Document 3 is provided, there is a possibility that the occurrence of stagnation can be suppressed. In Patent Document 3, the baffle plate is fixed to the inner wall of the reaction vessel via a pair of upper and lower arms, and a gap is formed between the baffle plate and the inner wall of the reaction vessel. Then, since the liquid can flow between the baffle plate and the wall surface of the reaction tank, there is a possibility that stagnation may be prevented from occurring in the vicinity of the wall surface of the reaction tank.

However, even in the baffle plate of Patent Document 3, since there are a pair of upper and lower arms between the baffle plate and the wall surface of the reaction tank, if solid matter adheres to the arms, the solid matter can be deposited as a trigger. There is sex. As solid matter builds up, it can fill the gap between the baffle plate and the reaction vessel wall. Therefore, even in the technique of Patent Document 3, if deposits are generated, the deposits and the like must be removed, and the equipment must be stopped in order to remove the deposits and the like.

In view of the above circumstances, it is an object of the present invention to provide a reaction vessel and a stirring reaction apparatus capable of suppressing the generation of deposits to the extent that the operation must be stopped while promoting the stirring of the liquid.

(Reaction tank)
The reaction tank of the first invention is a reaction tank used for stirring liquid by a stirring device having a rotating shaft and a stirring blade provided on the rotating shaft, and the rotating shaft of the stirring device is the central axis. It is arranged with a gap between the tank body for accommodating the liquid to be agitated by the stirrer and the inner wall of the tank body near the inner wall of the tank body , which is arranged so as to be substantially parallel to the tank body. The baffle plate is provided, and the baffle plate is arranged so that its surface is orthogonal to the radial direction of the tank body, and the surface is connected so as to be non-parallel to the surface of the baffle plate. It is characterized by having a flange portion having a width narrower than the width of the baffle plate .
The reaction vessel of the second invention, in the first invention, the front Symbol baffles that are disposed in the suspended state such that a gap is formed between the bottom surface of the tank body and a lower end It is characterized by.
(Stirring reactor)
The stirring reaction apparatus of the third invention has a reaction vessel according to the first or second invention , a rotating shaft, and a stirring blade provided on the rotating shaft, and agitates the liquid in the reaction vessel. It is characterized by having.
The stirring reaction apparatus of the fourth invention is characterized in that, in the third invention , a pipe for blowing a gas into the liquid in the reaction tank is provided, and the pipe is installed on the surface of the baffle plate.

(Reaction tank)
According to the first invention, when the liquid in the tank body is stirred by the stirring device, the effect of stirring the liquid can be enhanced. Moreover, since the baffle plate has a small surface facing the flow of the liquid swirling in the tank body, it is possible to suppress the occurrence of stagnation and the accumulation of solid matter due to the stagnation . Since it increases the effect of damming the handed circumfluence, it tends to form a flow of liquid which rises while swirling. Then, the time until the liquid reaches the liquid surface can be lengthened as compared with the case where the liquid rises straight toward the liquid surface .
According to the second invention , the baffle plate is suspended, and there is no member in the liquid that connects the baffle plate and the tank body. Therefore, it is possible to prevent stagnation, accumulation of solid matter, and the like due to the provision of the baffle plate.
(Stirring reactor)
According to the third invention , when the liquid is stirred by the stirring device, the effect of stirring the liquid in the tank body of the reaction tank can be enhanced. Moreover, since the baffle plate has a small surface facing the flow of the liquid swirling in the tank body of the reaction tank, it is possible to suppress the occurrence of stagnation and suppress the accumulation of solid matter due to stagnation. it can.
According to the fourth invention , since the outlet of the pipe can be arranged in the region where the flow velocity is relatively high near the baffle plate, the mixing of the blown gas and the liquid can be promoted.

It is the schematic explanatory drawing of the stirring reaction apparatus 1 of this embodiment. FIG. 1 is a cross-sectional view taken along the line II-II of FIG. It is the schematic explanatory drawing of the stirring reaction apparatus of the comparative example.

The stirring reaction apparatus of the present invention is an apparatus having a function of stirring a liquid in a reaction vessel, and is characterized in that it has a structure in which stagnation and accumulation of solid matter are unlikely to occur in the reaction vessel.

The application in which the stirring reactor of the present invention is used is not particularly limited. For example, a device that dissolves a nickel mat and leaches chlorine in a facility that manufactures nickel by the chlorine leaching electrolytic sampling method, or a device that dissolves a mixed sulfide raw material containing nickel (Ni) and cobalt (Co) in a liquid such as water. , The stirring reaction apparatus of the present invention can be used for an apparatus for producing nickel carbonate from the electrolytic waste liquid of the Matte Chlorine Leaching Electrowinning (MCLE) process.

In the following description, the case where the stirring reaction device of the present invention is used as the device for leaching chlorine in the equipment for carrying out the chlorine leaching electrowinning method will be described as a representative. That is, a crushed product obtained by crushing a nickel mat containing nickel sulfide as a main component is dispersed in a chloride aqueous solution, and chlorine gas is blown into the chloride aqueous solution in which the crushed product is dispersed to remove valuable metals such as nickel, cobalt and copper. The case where the stirring reaction device of the present invention is used as the device for leaching chlorine will be described as a representative.

(Stirring / dissolving device 1 of this embodiment)
In FIGS. 1 and 2, reference numeral 2 indicates a tank body of the reaction tank in the stirring / dissolving apparatus 1 of the present embodiment. The tank body 2 is a hollow bottomed tubular member having an opening at the top. The tank body 2 has a liquid storage space 2h having a circular cross section for storing the aqueous chloride solution S inside.

The tank body 2 is provided with a top plate 2a at the top, and the opening at the top is closed by the top plate 2a. The top plate 2a is provided with a supply unit 2d for supplying a nickel mat or ore containing a valuable metal to the chloride aqueous solution S in the liquid storage space 2h. Further, although not shown, the tank body 2 is also provided with a discharge unit for discharging the chloride aqueous solution S (that is, the chlorine leaching solution) in which the valuable metal is leached into the next step.

(Agitator 10)
As shown in FIGS. 1 and 2, a stirring device 10 for stirring the chloride aqueous solution S is provided in a substantially central portion of the tank body 2. The stirring device 10 includes a rotating shaft 11 arranged so as to be substantially coaxial with the central axis of the tank body 2, and a stirring blade 12 provided on the rotating shaft 11. Further, one end (upper end in FIG. 2) of the rotating shaft 11 projects outward from the top plate 2a and is connected to a drive source 14 such as a motor.

Therefore, if the drive source 14 is driven, the stirring blade 12 rotates together with the rotating shaft 11, and the chloride aqueous solution S in the tank body 2 can be stirred by the rotation of the stirring blade 12.

The number of stirring blades 12 provided on the rotating shaft 11 is not particularly limited. It may be provided in one stage or in two or more stages. If the stirring blades 12 are provided in a plurality of stages, the stirring force can be increased and the flow state of the chloride aqueous solution S formed in the tank body 2 can be adjusted. For example, if a pitched turbine having high shear performance is used as the stirring blade 12, it becomes easy to generate a flow in the rotation direction of the rotating shaft 11. Further, if a propeller is adopted as the stirring blade 12, it becomes easy to generate an axial flow of the rotating shaft 11. Then, when the pitched turbine and the propeller are used in combination, a flow of the chloride aqueous solution S that swirls in the vertical direction while swirling around the axis of the rotating shaft 11 can be generated in the tank body 2.

Further, when a plurality of stirring blades 12 are provided on the rotating shaft 11, the diameters of all the stirring blades 12 may be the same, or the diameters may be different from each other. It may be appropriately determined according to the flow formed in the tank body 2.

Further, when a plurality of stirring blades 12 are provided on the rotating shaft 11, the distance between the adjacent stirring blades 12 may be appropriately determined according to the flow formed in the tank body 2, and may be at equal intervals or different. You may.

(Interfering board 5)
As shown in FIGS. 1 and 2, a plurality of (4 in FIG. 2) baffle plates 5 are provided inside the tank body 2 of the reaction tank so as to surround the stirring device 10. The plurality of baffle plates 5 are all formed in the same shape. The plurality of baffle plates 5 are provided so as to be rotationally symmetric and equiangularly spaced with respect to the central axis of the tank body 2.

As shown in FIGS. 1 and 2, the baffle plate 5 is provided with a pair of flange portions 7 and 7 at both ends of a plate-shaped main body portion 6 in the width direction. That is, the baffle plate 5 has a substantially I-shaped (or H-shaped) cross section (see FIG. 2).

The baffle plate 5 is formed so that the distance H between both ends thereof is shorter than the diameter of the tank body 2 and longer than the width B of the pair of flange portions 7, 7. For example, the baffle plate 5 has a distance H between both ends of 0.05D to 0.2D (D is the inner diameter of the tank body 2 (see FIG. 2), the same applies hereinafter), and the width B of the pair of flange portions 7 and 7. Is formed to be 0.08D to 0.02D.

Further, the baffle plate 5 is provided inside the tank body 2 so that the outer surface 6a and the inner surface 6b of the main body 6 are orthogonal to the radial direction of the tank body 2. In the present specification, the fact that the two are orthogonal means that the radial direction of the tank body 2 (that is, the line orthogonal to the central axis of the tank body 2, see the line DL of FIG. 2) and the outer surface 6a and the inner surface 6b of the main body 6 are It includes both the case of being orthogonal and the case of being substantially orthogonal. For example, the angles θ1 and θ2 formed by the radial direction of the tank body 2 and the outer surface 6a and the inner surface 6b of the main body 6 are about 90 ° ± 30 °, more preferably the angles θ1 and θ2 are about 90 ° ± 20 °. This state is included in the present specification when the radial direction of the tank body 2 and the outer surface 6a and the inner surface 6b of the main body 6 are orthogonal to each other.

Moreover, the baffle plate 5 is provided so that the outer surface 6a of the main body 6 is separated from the inner wall 2w of the tank main body 2 to some extent. That is, the baffle plate 5 is provided so as to form a gap gw through which the aqueous chloride solution S can flow between the baffle plate 5 and the inner wall 2w of the tank body 2. Of course, a gap through which the aqueous chloride solution S can flow is also formed between the edge edges of the pair of flange portions 7 and 7 and the inner wall 2w of the tank body 2. For example, assuming that the distance from the outer surface 6a of the main body 6 to the inner wall 2w of the tank main body 2 is L, the distance L is formed to be about 0.02D to 0.3D.

The baffle plate 5 is provided so that the lower end thereof is separated from the bottom 2b of the tank body 2 in a suspended state. That is, the baffle plate 5 is provided so that a gap gb through which the aqueous chloride solution S can flow is formed between the lower end thereof and the bottom 2b of the tank body 2. For example, assuming that the distance from the lower end of the baffle plate 5 to the bottom 2b of the tank body 2 is L2, the distance L2 is set to be about 100 to 500 mm.

The "suspended state" here means that the baffle plate 5 and the tank body 2 are between the portion of the baffle plate 5 immersed in the chloride aqueous solution S and the inner wall 2w and the bottom 2b of the tank body 2. It means that there is no member connecting between the inner wall 2w and the bottom 2b. For example, the "suspended state" includes a state in which the upper end of the baffle plate 5 is connected to the top plate 2a of the tank body 2 (see FIG. 1), or from the liquid level of the chloride aqueous solution S in the tank body 2. A state in which a beam or the like is provided in a portion located above and the upper end of the baffle plate 5 is connected to the beam or the like can be mentioned. In addition, if the upper part of the tank body 2 is open, the state where the upper end of the obstruction plate 5 is connected to the ceiling or beam of the building where the tank body 2 is provided is also "suspended". Included in the "state".

The length of the baffle plate 5 (length in the vertical direction) is not particularly limited. When the baffle plate 5 is suspended so that the lower end is separated from the bottom 2b of the tank body 2 as described above, the length is such that the upper part of the baffle plate 5 is exposed from the water surface of the chloride aqueous solution S. Is preferable.

Further, the thickness of the baffle plate 5 is not particularly limited as long as it has a strength that does not break when the chloride aqueous solution S is agitated, and the distance H between both ends and the widths of the flange portions 7 and 7 are not particularly limited. It suffices if it is thinner than B.

If the plurality of baffle plates 5 arranged as described above are provided in the storage space 2h of the tank body 2, the chloride aqueous solution S (chlorine leachate) in the storage space 2h of the tank body 2 is provided by the stirring device 10. The chloride aqueous solution S (chlorine leachate) interferes with the plurality of baffle plates 5 when the mixture is stirred. Then, the flow of the chloride aqueous solution S (chlorine leachate) in the accommodation space 2h of the tank body 2 is moved in the vertical direction to the swirling flow around the central axis of the tank body 2 (in other words, the rotating shaft 11 of the stirring device 10). It can be an added flow. Then, the effect of stirring the chloride aqueous solution S (chlorine leachate) in the storage space 2h of the tank body 2 can be enhanced, so that the state of the chloride aqueous solution S (chlorine leachate) in the storage space 2h of the tank body 2 can be enhanced. Can be brought close to a homogeneous state (for example, a state in which the oxidation-reduction potential, pH, concentration distribution of chlorine in the liquid in the tank, etc. are uniform).

Further, the baffle plate 5 is provided inside the tank body 2 so that the outer surface 6a and the inner surface 6b of the main body 6 are orthogonal or substantially orthogonal to the radial direction of the tank body 2. Therefore, even if the pair of flange portions 7 and 7 are provided, the chloride aqueous solution S (which swirls in the tank body 2) is swirled in the tank body 2 as compared with the case where the main body 6 is arranged substantially parallel to the radial direction of the tank body 2. The surface facing the flow of the chlorine leachate becomes smaller. Moreover, the baffle plate 5 is installed in a suspended state inside the tank body 2, and the baffle plate 5 is connected to the inner wall 2w and the bottom 2b of the tank body 2 in the chloride aqueous solution S (chlorine leachate). There is no member to do. Therefore, it is possible to prevent the stagnation of the aqueous chloride solution S (chlorine leachate) and the accumulation of solid matter due to the provision of the baffle plate 5 in the tank body 2.

Then, since it is not necessary to carry out the work of removing the deposits of the tank body 2 for a certain period of time, it is possible to prevent a decrease in the work efficiency of the chlorine leaching work.

(Arrangement of piping P)
At the time of chlorine leaching, since chlorine is continuously blown into the chloride aqueous solution S (chlorine leaching solution), a pipe P for blowing chlorine is provided (see FIGS. 1 and 2), but the pipe P is placed on the obstruction plate 5. It may be attached.

For example, as shown in FIGS. 1 and 2, the flow of the swirling flow when the swirling flow is generated by the stirring device 10 on the inner surface 6b of the main body 6 of the baffle plate 5 (arrow F in FIG. 2). The pipe P is arranged in the vicinity of the flange portion 7 located on the downstream side of the pipe P. Then, the gas discharge port Pa of the pipe P is arranged near the lower end of the inner surface 6b of the flange portion 7 on the downstream side of the baffle plate 5. In this case, since the pipe P can be firmly fixed to the baffle plate 5 by using a U bolt or the like, the pipe P can be maintained in a stable state. Further, the influence of the pipe P on the flow of the chloride aqueous solution S (chlorine leachate) can be reduced.

Moreover, if the gas discharge port Pa of the pipe P is arranged near the lower end of the inner surface 6b of the flange portion 7 on the downstream side of the baffle plate 5, the mixing of the blown chlorine and the chloride aqueous solution S (chlorine leachate) is promoted. can do. That is, since the flow velocity of the chloride aqueous solution S (chlorine leachate) is relatively high near the lower end of the inner surface 6b of the downstream flange portion 7, the blown chlorine and the chloride aqueous solution S (chlorine leachate) are mixed. Can be promoted. Then, since the concentration of chlorine in the chloride aqueous solution S (chlorine leachate) can be brought close to uniform, the state of the chloride aqueous solution S (chlorine leachate) can be brought close to a homogeneous state.

(About the obstacle board 5)
In the above example, the case where the flange portions 7 are provided at both ends of the baffle plate 5 in the width direction has been described, but the flange portions 7 do not necessarily have to be provided. However, if the baffle plate 5 is provided with the flange portion 7, the baffle plate 5 increases the effect of damming the swirling flow, so that it becomes easy to form the flow of the chloride aqueous solution S that rises while swirling. Then, the time until the chloride aqueous solution S reaches the liquid surface can be lengthened as compared with the case where the chloride aqueous solution S rises straight toward the liquid surface. Therefore, since the effect of stirring the chloride aqueous solution S can be enhanced, the state of the chloride aqueous solution S can be easily brought close to a homogeneous state.

Further, when the flange portions 7 are provided, the number and positions thereof are not particularly limited.
For example, the flange portion 7 is added to both ends in the width direction of the baffle plate 5, and the surfaces between both ends in the width direction of the baffle plate 5 (that is, the outer surface 6a and the inner surface 6b of the main body portion 6; It may be provided on the surface). In this case, the distance from the outer edge of the stirring blade 12 to the flange portion 7 is increased even if the width of the flange portion 7 is the same, as compared with the case where the flange portions 7 are provided only at both ends in the width direction of the baffle plate 5. Since it can be close to each other, it is preferable in that the effect of shearing the aqueous chloride solution S can be enhanced.

Further, in the baffle plate 5, the flange portion 7 may be provided only at one end portion in the width direction. For example, the flange portion 7 is not provided at the end portion located on the upstream side with respect to the swirling flow in the tank body 2, and the flange portion 7 is provided at the end portion located on the downstream side. In this case, it is preferable in that the following problems can be prevented. If solid matter is temporarily deposited on the flange portion 7 due to the stagnation that occurs on the downstream side of the flange portion 7 provided on the downstream side, the deposit may be peeled off from the flange portion 7. However, when the flange portions 7 are provided only at the ends located on the downstream side, the deposits are peeled off from the flange portions 7 as compared with the case where the flange portions 7 are provided at both ends in the width direction of the baffle plate 5. It is also preferable in that the possibility that the mass of the peeled-off deposit directly collides with the stirring blade 12 can be reduced.

When the flange portion 7 is provided only on the downstream end of one end in the width direction, the flange portion 7 may also be provided on the surface of the intermediate portion. In this case, stagnation also occurs between the flange portion 7 on the surface of the intermediate portion and the flange portion 7 provided on the downstream side thereof. However, even if solids are deposited between the flange portion 7 on the intermediate surface and the flange portion 7 on the downstream side, the deposits are difficult to peel off, so that the peeled deposits may directly collide with the stirring blade 12. The effect of being able to lower it can be expected.

On the contrary, the flange portion 7 may not be provided at the end portion located on the downstream side with respect to the swirling flow in the tank body 2, and the flange portion 7 may be provided only at the end portion located on the upstream side. In this case, it is preferable in that stagnation is less likely to occur on the downstream side of the baffle plate 5 as compared with the case where the flange portions 7 are provided at both ends in the width direction of the baffle plate 5.

Even when the flange portion 7 is provided only on the upstream end portion of one end portion in the width direction, the flange portion 7 may be provided on the surface of the intermediate portion. In this case as well, even if solids are deposited between the flange portion 7 on the surface of the intermediate portion and the flange portion 7 on the upstream side thereof, the deposits are difficult to peel off, so that the peeled deposits directly collide with the stirring blade 12. You can expect the effect of reducing the possibility of doing so.

Further, the flange portions 7 may be provided only on the surface of the intermediate portion without providing the flange portions 7 at both ends in the width direction of the baffle plate 5. In this case, as compared with the case where the flange portions 7 are provided only on both ends in the width direction of the baffle plate 5, and the cases where the flange portions 7 are provided on both both ends in the width direction and the surface of the intermediate portion of the baffle plate 5. Even if the width of the flange portion 7 is the same, the effect of changing the swirling flow to the ascending flow becomes large. Then, when the flange portion 7 is provided only on the surface of the intermediate portion, it is easy to obtain a sufficient effect of changing the swirling flow to the ascending flow even if the flange portion 7 is made smaller, so that the weight of the baffle plate 5 may be reduced. There is.

When the flange portion 7 is provided on the surface of the intermediate portion of the baffle plate 5, the number of flange portions 7 provided is not particularly limited. One sheet may be provided, or a plurality of sheets may be provided. When the number of flange portions 7 is increased, it is preferable that even if solid matter is deposited, the deposit is less likely to come off, but the weight of the baffle plate 5 is increased. Therefore, the number of flange portions 7 provided on the surface of the intermediate portion of the baffle plate 5 may be appropriately adjusted according to the purpose and the like.

Further, if the arrangement (position and spacing) of the flange portions 7 on the baffle plate 5 is changed, the influence on the flow of the chloride aqueous solution S changes. Therefore, the arrangement (position and spacing) of the flange portions 7 can be adjusted according to the purpose and the like. It may be adjusted appropriately.

The plurality of baffle plates 5 do not necessarily have the same shape. For example, with respect to the baffle plate 5 to which the chlorine supply pipe P is attached, the entire baffle plate 5 is more than the other baffle plates 5 from the viewpoint of the strength of the structure supporting the baffle plate 5 (for example, the top plate 2a, etc.). May be lighter in weight. For example, the baffle plate 5 to which the pipe P is attached may have a narrower width H of the baffle plate 5 and a width H of the baffle plate 5 closer to the width B of the flange portion 7 than the other baffle plates 5. .. However, if the shapes of the plurality of baffle plates 5 are all the same, there is an advantage that the state of the agitated chloride aqueous solution S can be easily brought to a uniform state in the tank body 2.

The baffle plate 5 does not necessarily have to be provided so that the outer surface 6a and the inner surface 6b of the main body 6 are orthogonal to or substantially orthogonal to the radial direction of the tank main body 2. For example, the baffle plate 5 may be arranged so that the outer surface 6a and the inner surface 6b of the main body 6 are substantially parallel to the radial direction of the tank main body 2. However, if the baffle plate 5 is provided so that the outer surface 6a and the inner surface 6b of the main body 6 are orthogonal to or substantially orthogonal to the radial direction of the tank body 2, the baffle plate 5 swirls in the tank body 2. On the other hand, the facing surface can be made smaller. Then, stagnation caused by the provision of the baffle plate 5 and accumulation of solid matter due to the stagnation can be made less likely to occur.

The number of the baffle plates 5 does not necessarily have to be a plurality, and may be one. Further, even when a plurality of baffle plates 5 are provided, they do not necessarily have to be provided rotationally symmetrically with respect to the central axis of the tank body 2. Further, the plurality of baffle plates 5 do not necessarily have to be equiangularly spaced. An appropriate number of baffle plates 5 may be installed at appropriate positions according to the flow formed in the tank body 2. However, if a plurality of baffle plates 5 are provided and a plurality of baffle plates 5 are provided so as to be rotationally symmetric and equiangularly spaced with respect to the central axis of the tank body 2, the stirred chloride aqueous solution is provided. It becomes easy to bring the state of S closer to homogeneous in the tank body 2.

Regarding the stirring reaction device having the baffle plate of the present invention and the stirring reaction device provided with the general baffle plate, the deposition state of solid matter and the like was confirmed.

In the experiment, in the stirring reaction device used in the chlorine leaching step of non-ferrous metal sulfide, a baffle plate was placed in the reaction tank to confirm the generation state of deposits on the baffle plate.

In Example 1, a baffle plate was provided in the reaction vessel of the stirring reaction apparatus by the method shown in FIGS. 1 and 2. The obstruction plate used is a steel material having an I-shaped cross section (that is, a plate material having a flange portion as described in the present specification), has a thickness of 16 mm, and has B × H = 0.05D × 0.15D (D: reaction tank). Inner diameter) (see FIG. 2).

Four of these baffle plates were suspended in the reaction vessel so as to be rotationally symmetric with respect to the central axis of the reaction vessel.
Further, the baffle plate was installed so that the distance L (see FIGS. 1 and 2) from the surface thereof to the inner wall of the reaction tank was 0.15D.
The baffle plate was inserted into the chlorine leachate by 0.9X, where X is the liquid level height of the chlorine leachate in the reaction vessel. When such a length is inserted into the chlorine leachate, the distance L2 from the lower end of the baffle plate to the bottom surface of the reaction tank is about 300 mm.

In Comparative Example 1, a baffle plate was provided in the reaction vessel of the stirring reaction device as shown in FIG. The baffle plate used is a plate material having a thickness of 16 mm and a width of 0.1 D (D: inner diameter of the reaction vessel).
Four of these baffle plates were installed so as to be rotationally symmetric with respect to the central axis of the reaction vessel.
The surface of the baffle plate should be approximately parallel to the radial direction of the reaction vessel. The side edge was fixed to the inner wall of the reaction vessel, and the lower end edge thereof was fixed to the bottom surface of the reaction vessel (see FIG. 3).

As a result, the reaction vessel of Example 1 was operated continuously for 6 months, but a high leaching rate of valuable metals such as nickel was maintained. Moreover, after continuous operation for 6 months, the condition of the baffle plate was confirmed, but no large solid matter adhered to the baffle plate.

On the other hand, in the reaction vessel of Comparative Example 1, since a large amount of deposits were deposited on the baffle plate, it was necessary to stop the operation once every three months to remove the deposits from the baffle plate.

From the above results, if the baffle plate is installed by the method shown in FIGS. 1 and 2, it is possible to suppress the adhesion of solid matter to the baffle plate and prevent large solid matter from accumulating on the baffle plate. Was confirmed.

The stirring reaction device of the present invention is suitable for a device for stirring a liquid containing a solid substance.

1 Stirring reaction device 2 Tank body 2b Bottom 2w Inner wall 5 Baffle plate 6 Main body 6a Outer surface 6b Inner surface 7 Flange 10 Stirrer 11 Rotating shaft 12 Stirring blade gb Gap gw Gap S Chloride aqueous solution

Claims (4)

A reaction vessel used for stirring a liquid by a stirring device having a rotating shaft and a stirring blade provided on the rotating shaft.
A tank body containing a liquid to be agitated by the agitator, which is arranged so that the rotation axis of the agitator is substantially coaxial with the central axis .
It is provided with a baffle plate arranged in the vicinity of the inner wall of the tank body with a gap between it and the inner wall of the tank body.
The obstacle board is
The surface is arranged so as to be orthogonal to the radial direction of the tank body .
A reaction vessel characterized by having a flange portion whose surface is connected so as to be non-parallel to the surface of the baffle plate and whose width is narrower than the width of the baffle plate . The obstacle board is
The reaction tank according to claim 1 , wherein the reaction tank is suspended so as to form a gap between the lower end thereof and the bottom surface of the tank body. The reaction vessel according to claim 1 or 2 ,
A stirring reaction apparatus having a rotating shaft and a stirring blade provided on the rotating shaft, and comprising a stirring device for stirring the liquid in the reaction vessel. It is equipped with a pipe that blows gas into the liquid in the reaction vessel.
The stirring reaction device according to claim 3, wherein the pipe is installed on the surface of the baffle plate.

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