JP3759517B2 - Solid particle desalting method, desalting apparatus, and solid particle recycling system including the desalting apparatus - Google Patents

Description

  The present invention relates to a desalting method and a desalting apparatus for desalting solid particles such as incineration ash, soil, and illegal dumping, and a solid particle recycling system including the desalting apparatus.

  In recent years, desalting of solid particles such as incineration ash has been carried out by using this as a substitute for clay, which is part of cement, and recycling has been carried out, and the desalting usually adheres to solid particles such as incineration ash. It is performed by mechanically washing and removing the salt content in the following manner.

(1) Spiral system This is a system in which a drum with spiral blades on the outer periphery is rotated in a horizontally placed semi-cylindrical water tank and washed through incinerated ash. Fine particles like main ash It is applied to particles having a relatively uniform particle size distribution including from coarse particles to coarse particles.

(2) Stirring method This is a method of cleaning by rotating the propeller in the lower part of a cylindrical water tank, putting incinerated ash into this water tank and stirring, and is applied to fine particles such as fly ash .

(3) Ejector method This is a method of cleaning by mixing incinerated ash and water in a water tank using negative pressure generated in a confluence pipe, and is applied to fine particles such as fly ash.

  However, these mechanical washing methods have a problem that the desalination equipment is complicated and the cost increases when a large amount of incinerated ash is processed. Further, since the desalting treatment is performed in a short time, it is difficult to remove a hardly soluble salt such as Friedel's salt, and there is a problem that the desalting effect cannot be expected much even though it is expensive. Furthermore, since a large amount of water is used for desalting, there is a problem that the cost of the sewage treatment facility for treating it is increased.

By the way, as shown in Non-Patent Document 1, the inventors of the present application wash waste at a waste disposal site, collect salt contained in wastewater as industrial salt, etc., and recycle waste as cement raw material. In this case, for example, incineration ash as waste is shown respectively. As shown in FIG. 2B, the incineration ash 2 in the storage tank 1 is sprayed with water from above and stored. Washing method by downward flow draining from the bottom of the tank 1 or storing water by injecting water into the incinerated ash 2 in the storage tank 1 by injecting water from the bottom of the storage tank 1 as shown in FIG. It is considered to apply a cleaning method by upward flow that drains from the upper end of the tank 1.
Edited by WOW System Research Committee, Water Treatment Technology Research Committee, Environmental Industrial Newspaper Co., Ltd. “Leachable Water Treatment Technology Guidebook” issued on December 27, 2001, pages 22, 39-40

  However, when the present inventor conducted an experiment to examine the above cleaning method, the downward cleaning method in which water is sprinkled from above into the storage tank and drained from the bottom of the storage tank has a water path in the waste. On the other hand, there is a problem that it is difficult to perform uniform processing over the entire waste. On the other hand, water is supplied from the bottom of the storage tank, and water is permeated upward into the storage tank to drain from the upper end of the storage tank. It was found that the countercurrent cleaning method has a problem that salt cannot be sufficiently desalted because the salt sinks to the bottom of the storage tank.

  As a result of further research on the above-described cleaning method, the present inventor has found that contact time between water and salt requires a certain amount of time to remove salt.

The object of the present invention is to provide a desalting method and a desalting apparatus that have advantageously solved the problems of the prior art based on the above knowledge, and a solid particle recycling system using the desalting method. In the method for desalinating solid particles according to the first aspect of the present invention, the solid particles in the storage tank are supplied by supplying water from the vicinity of the bottom of the storage tank into the storage tank storing the solid particles used for the cement raw material. At least 3 treatments in which the immersion state is maintained for a predetermined time between 1 hour and 2 days , and then the water in the storage tank is discharged from the vicinity of the bottom of the storage tank. It is characterized by being repeated for days .

According to a sixth aspect of the present invention, there is provided a demineralizer for solid particles according to the present invention, a storage tank for storing solid particles used as a cement raw material, and water stored in the storage tank from near the bottom of the storage tank. Water supply means for immersing solid particles in the tank in water, water discharge means for discharging the water in the storage tank from near the bottom of the storage tank, and after water supply to the storage tank by the water supply means And a control means for repeatedly performing at least three days the process of discharging the water in the storage tank by the water discharging means after maintaining the immersion state for a predetermined time between 1 hour and 2 days. It is characterized by that.

The desalination system of the solid particles of the present invention according to claim 8, with at least three chromatic said reservoir, simultaneously performing the unloaded loading and immersion of the solid particles constituting the first processing cycle according Item 8. A solid-particle desalting apparatus according to Item 6 or 7 is provided.

According to the desalting method of the present invention described above, since the solid particles used for the cement raw material in the storage tank are immersed in water, a uniform treatment over the entire solid particles in the storage tank can be performed, Since water is discharged from the vicinity of the bottom of the storage tank, salt does not sink to the bottom of the cleaning tank . And , since the solid particles in the storage tank are infiltrated with water upward, and the solid particles are immersed in water and then drained downward, the water rises and falls around the solid particles and evenly contacts the solid particles, Moreover, since the contact time between water and salt can be set as necessary, the salt can be effectively removed.

Furthermore , in the desalination method of the present invention, after the solid particles are immersed in water in the storage tank, the immersion state is maintained for a predetermined time between 1 hour and 2 days, and then the water is discharged. The process is repeated, and the period during which the process is repeated is at least 3 days . Thus, the solid particles repeated at least 3 days of treatment for discharging the water after maintaining a predetermined time between 2 days 1 hour while being immersed in water row Unode also poorly soluble salt It can be removed from the solid particles .

In addition, in the desalting method of this invention, it is preferable that the water supplied in the said storage tank is warm water. Since the viscosity coefficient μ of water is smaller in warm water than in cold water, the permeability coefficient k in soil mechanics is increased and water permeability is improved even for fine solid particles. This is because the adhering salt content can be brought into good contact with water to enhance the desalting effect.

  Furthermore, in the desalting method of this invention, it is preferable that the solid particles stored in the storage tank are immersed in water while being spread and leveled. In a waste treatment facility, compaction is generally performed in order to maximize the amount of waste to be stored. However, if compaction is performed, the clearance ratio e in soil mechanics is reduced and the hydraulic conductivity k is reduced. If you immerse in water in a flattened state without compacting, the gap ratio e will increase, so the water permeability coefficient k will also increase, and the salt content attached to the solid particles will be in good contact with the water so that the desalination effect It is because it can raise.

  Furthermore, in the desalting method of the present invention, when the solid particles to be desalted are fine particles, the coarse particles are mixed with the solid particles to improve the particle size distribution, and then stored in the storage tank. It is preferable. If the particle size distribution is improved (if the particle distribution is spread over a wide range of the particle size accumulation curve in soil mechanics), the clearance ratio e increases, so the permeability coefficient k also increases, and the salt attached to the solid particles is reduced. This is because the desalting effect can be enhanced by bringing it into good contact with water.

  In the desalting method of the present invention, after desalting in the storage tank, the coarse particle size adjusted product is separated from the solid particles of the fine particles, and the particle size adjusted product can be reused. preferable. This is because the desalination treatment cost can be reduced by reusing the particle size adjusted product.

Further, according to the solid particle desalting apparatus of the present invention described above, a storage tank for storing the solid particles used for the cement raw material, and water is supplied into the storage tank from near the bottom of the storage tank. Water supply means for immersing the solid particles in water, water discharge means for discharging the water in the storage tank from near the bottom of the storage tank, and after water supply to the storage tank by the water supply means, The water supply means and the water so as to repeat the process of maintaining the immersion state for a predetermined time between 1 hour and 2 days and then discharging the water in the storage tank by the water discharge means for at least 3 days A control means for controlling the water discharge means, so that the solid particles in the storage tank used for the cement raw material are immersed in water to perform homogeneous treatment over the entire solid particles in the storage tank. Can also water By discharged from near the bottom of Tomeso, it is possible to prevent the salt will sink into the cleaning tank bottom and upwardly infiltrated water to solid particles in the storage tank and the solid particles after immersion in water By draining, the water rises and falls around the solid particles and contacts the solid particles evenly, and the contact time between water and salt can be set as much as necessary, so that the salt can be removed effectively. it can.
Furthermore, since the process of maintaining the state in which the solid particles are immersed in water for a predetermined time between 1 hour and 2 days and then discharging the water is repeated for at least 3 days, the hardly soluble salt is also removed from the solid particles. Can be removed.

  In the solid particle desalting apparatus of the present invention, it is preferable that the water supply means supplies hot water into the storage tank. Since the viscosity coefficient μ of hot water is smaller than that of cold water, the water permeability coefficient k is increased and water permeability is improved even for fine solid particles. This is because the desalting effect can be enhanced by bringing the material into good contact with water.

  Further, according to the solid particle desalination system of the present invention described above, since the solid particle desalination apparatus having at least three storage tanks is provided, it is possible to carry in the solid particles that constitute one processing cycle in these storage tanks. Soaking and unloading can be performed simultaneously, and desalting can be performed continuously and efficiently.

In the solid particle desalination system of the present invention, the standby facility for waiting for the solid particles to be desalted, the foreign matter removing device for removing foreign matters from the solid particles to be desalted, and the water discharge means are disposed in the storage tank. It is preferable to provide at least one of water treatment facilities for treating water discharged from water. Provided with a standby facility for waiting for solid particles to be desalted, it is possible to absorb unevenness in the supply of solid particles to be desalted, and to remove a foreign matter such as a large steel ingot from the solid particles to be desalted. If provided, the commercial value of the desalted solid particles as a cement raw material can be increased, and the water discharge means includes a water treatment facility for treating the water discharged from the storage tank. This is because the surrounding environment can be kept clean.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the solid particle desalination system of the present invention, which includes an embodiment of the solid particle demineralization apparatus of the present invention. FIG. FIG. 2 (b) and FIG. 2 (c) schematically show a conventional desalting method according to an embodiment of the desalting method for solid particles of the present invention performed by the desalting apparatus of the examples. It is explanatory drawing shown.

  The solid particle desalination system of the above embodiment is mainly for desalinating incineration ash as solid particles generated in an incineration plant to obtain a cement raw material. As shown in FIG. 1, three storage tanks are used. 1a, 1b, 1c and a building 1d that separately accommodates the storage tanks, and water is supplied into the storage tanks 1a, 1b, 1c from near the bottom of the storage tanks. Water supply equipment (not shown) as water supply means for immersing the incinerated ash 2 in water, and water discharge (not shown) as water discharge means for discharging water in the storage tanks 1a, 1b, 1c from the vicinity of the bottom of the storage tank The desalination apparatus 3 according to the above-described embodiment has facilities and a control facility (not shown) having a normal computer that is provided in the management building 4 and operates the water supply facility and the water discharge facility according to a predetermined processing cycle. Have

The desalination system of the above embodiment further includes a standby facility 6 that is a building that houses a large number of containers 5 that store the incinerated ash, and the standby facility 6 and the treatment tank 1a, Trailer 7 for transferring container 5 between 1b and 1c, forklift 8 for unloading container 5 to and from trailer 7, and incineration for desalting from container 5 on trailer 7 in treatment tanks 1a, 1b and 1c The ash 2 is lowered and the backhoe 10 supplied to the sorting machine 9 as a foreign matter removing device for removing foreign matter from the incinerated ash to be desalted, and the incinerated ash 2 from which foreign matter has been removed are spread in the treatment tanks 1a, 1b, 1c. then you a wheel loader 11, treatment tank 1a, 1b, and inclined approach path 12 to facilitate the entry and exit of the trailer 7 for 1c, the water discharge facility reservoir 1a, 1b, the 1c Normal wastewater treatment facility 13 as a water treatment facility that treats the salt-containing water discharged from the sea so that it can be discharged into the sea, etc., an empty container place 14 for land transportation, and an empty container place for shipping 15, a weighing facility 16 for weighing the incinerated ash before being desalted and the incinerated ash after being desalted, and a car washing facility 17 for washing the vehicle such as the backhoe 10 and the wheel loader 11. Yes.

  In such a desalination system, the incinerated ash 2 to be desalted in one of the three storage tanks 1a, 1b, 1c (the storage tank 1a in the figure) is carried in, and at the same time, the three storage tanks Desalination treatment of the incinerated ash 2 by the desalination apparatus 3 of the above-described embodiment is performed in the other one of 1a, 1b, and 1c (in the figure, storage tank 1b), and at the same time, three storage tanks 1a, The incinerated ash 2 desalted in the remaining one of 1b and 1c (in the figure, storage tank 1c) is carried out. In the storage tank in which the incinerated ash 2 to be desalted is carried in, the desalting process is performed next, and in the storage tank in which the desalting process is performed, the desalted incinerated ash is then carried out, In the storage tank from which the salted incineration ash is carried out, the incineration ash to be desalted next is carried in. Therefore, according to the desalting system of this embodiment, the desalting treatment can be performed continuously and efficiently.

  At the time of the desalting treatment, the control facility of the desalting apparatus 3 of the above embodiment performs the desalting method of the above embodiment, and as shown in FIG. 2 (a), operates the water supply facility, Water is supplied from the vicinity of the bottom of the storage tank 1 into the storage tank 1 (that is, any one of 1a, 1b, 1c) storing the incineration ash 2, and the incineration ash 2 in the storage tank 1 is incinerated. After immersing in the water of about twice the volume of the ash 2 and maintaining the immersion state for a predetermined time between 1 hour and 2 days, the water discharge facility is operated to drain the water in the storage tank 1. The process of discharging from the vicinity of the bottom of the storage tank 1 and sending it to the sewage treatment facility 13 is repeated, and the process is repeated for at least 3 days, preferably 10 days.

  Therefore, according to the desalination system of the above embodiment, the incinerated ash 2 in the storage tanks 1a to 1c is immersed in water, so that a uniform desalting process is performed over the entire incinerated ash 2 in the storage tanks 1a to 1c. In addition, since water is discharged from the vicinity of the bottom of the storage tanks 1a to 1c, salt can be prevented from sinking to the bottom of the cleaning tank, and further, water can be supplied to the incinerated ash 2 in the storage tanks 1a to 1c. Since the incinerated ash 2 is soaked in water and drained downward, the water rises and descends around the incinerated ash 2 and evenly contacts the incinerated ash 2, and also contacts water and salt. Since the time can be set as necessary, salt can be effectively removed.

  Moreover, according to the desalination system of the said Example, after maintaining the state which the incinerated ash 2 was immersed in water in the storage tanks 1a-1c for a predetermined time between 1 hour and 2 days, the water is discharged | emitted. This process is repeated for at least 3 days, so that hardly soluble salts can be removed from the incinerated ash 2.

  Furthermore, according to the desalination system of the said Example, since the incinerated ash 2 stored in the storage tanks 1a-1c is not compacted, it lays and immerses in water with the leveling state, Therefore The clearance ratio in soil mechanics Since e becomes large, the water permeability coefficient k of the incineration ash 2 also becomes large, and the salt attached to the incineration ash 2 can be brought into good contact with water to enhance the desalting effect.

  As mentioned above, although demonstrated based on the example of illustration, this invention is not limited to the above-mentioned example, For example, the desalination system of the said Example is installed near a waste incineration facility, The waste incineration facility By using the remaining heat, the water supplied into the storage tanks 1a to 1c may be heated to warm water. In this way, since the viscosity coefficient μ of water becomes smaller in warm water than in cold water, the permeability coefficient k in soil mechanics increases and the permeability of fine solid particles becomes better. By immersing, the salt content attached to the solid particles can be brought into good contact with water to enhance the desalting effect.

  Further, in the desalination system of the above embodiment, when the incinerated ash 2 to be desalted is fly ash (fine particles having a particle size of 0.3 to 200 μm), a coarse particle size adjusted product (slag or It may be stored in the storage tanks 1a to 1c after mixing with a raw material such as limestone to improve the particle size distribution, and if the particle size distribution is improved in this way (the particle distribution is reduced). Since the clearance ratio e of the incineration ash 2 increases, the permeability coefficient k also increases, and the salt adhering to the incineration ash 2 is in good contact with water. To increase the desalting effect.

  In the case of the above, the fly ash after desalting and the coarse particle size adjusted product may be used as a cement raw material in a mixed state, but after desalting in the storage tanks 1a to 1c, The particle size adjusted product having a coarse particle size may be separated from the ash by a separator, and the particle size adjusted product may be recovered and reused. Can be lowered.

  Further, in the desalination system of the above embodiment, incineration ash from a plurality of waste incineration facilities may be treated, or waste or soil as solid particles dug up from a waste final disposal site, estuary You may desalinate the waste paper and the illegal dumping thing etc. which accumulated near. Further, four or more storage tanks may be provided in the desalination apparatus, and a storage tank that stores solid particles after the desalination treatment may be used as a cement raw material storage buffer when the cement factory is resting.

Thus, according to the present invention, it is possible to effectively remove salt from the solid particles, it is possible to perform processing by desalting ash to cement raw material efficiently.

It is a top view which shows one Example of the desalination system of the solid particle of this invention provided with one Example of the desalination apparatus of the solid particle of this invention. (A) is explanatory drawing which shows typically one Example of the desalting method of the solid particle of this invention which the desalting apparatus of the said Example performs, (b) and (c) are the conventional desalting methods It is explanatory drawing which shows this typically.

Explanation of symbols

1, 1a, 1b, 1c Storage tank 1d Building 2 Incinerated ash 3 Desalination equipment 4 Management building 5 Container 6 Waiting facility 7 Trailer 8 Forklift 9 Sorting machine 10 Backhoe 11 Wheel loader 12 Access path 13 Sewage treatment facility 14, 15 Empty container Place 16 Weighing equipment 17 Car wash equipment

Claims (9)

Supplying water from the vicinity of the bottom of the storage tank into the storage tank storing the solid particles used for the cement raw material, soaking the solid particles in the storage tank in water,
Then, after maintaining the immersion state for a predetermined time between 1 hour and 2 days , the water in the storage tank is discharged from near the bottom of the storage tank .
This process is repeated for at least 3 days . A method for desalting solid particles. 2. The method for desalinating solid particles according to claim 1, wherein the water supplied into the storage tank is warm water . 3. The method for desalinating solid particles according to claim 1, wherein the solid particles stored in the storage tank are immersed in water while being spread and leveled . When the solid particles to be desalted are fine particles, the coarse particles are mixed with the solid particles to average the particle size distribution and then stored in the storage tank. 4. The method for desalinating solid particles according to any one of 3 to 3. The solid particles according to claim 4, wherein after the desalting in the storage tank, the coarse particle size adjusted product is separated from the fine solid particles, and the particle size adjusted product is reused. Desalting method. A storage tank for storing solid particles used for the cement raw material;
Water supply means for supplying water from the vicinity of the bottom of the storage tank into the storage tank and immersing the solid particles in the storage tank in water;
Water discharge means for discharging water in the storage tank from near the bottom of the storage tank;
After supplying water into the storage tank by the water supply means, the immersion state is maintained for a predetermined time between 1 hour and 2 days, and then the water in the storage tank is discharged by the water discharge means. A control means for controlling the water supply means and the water discharge means so as to repeat the process for at least three days,
A solid-particle desalting apparatus comprising: The desalinating apparatus for solid particles according to claim 6 , wherein the water supply means supplies hot water into the storage tank . 8. The solid particle desalting apparatus according to claim 6, comprising at least three of the storage tanks and simultaneously carrying in, immersing and carrying out the solid particles constituting one treatment cycle. A desalination system for solid particles. A waiting facility for waiting for solid particles to be desalted;
A foreign matter removing apparatus for removing foreign matter from the solid particles to be desalted;
A water treatment facility for treating the water discharged from the storage tank by the water discharge means;
9. A solid particle desalination system according to claim 8 , comprising at least one of the following .

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