JPS604895A - Electrolytic decontaminating waste liquor regenerating treating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrolytic decontamination waste liquid regeneration processing apparatus that regenerates decontamination waste liquid used in an electrolytic polishing method.

Generally speaking, among radioactive wastes, metal wastes are currently filled in drums and the like and stored under strict conditions because no effective treatment method has been found, but there is a strong desire for a method to reduce this amount. Electrolytic polishing is currently known as one of the most effective methods for reducing this kind of damage. As is well known, the electrolytic polishing method has a relatively short decontamination time and a high decontamination effect, so in the future it is possible to treat gold@waste as general waste7 and to reduce the amount of UNλ. However, the electric current used in the electrolytic polishing method It is important to note that decontamination waste liquid must be contained and treated, as the decontaminated materials will dissolve in the swamp and this will lead to a decrease in current efficiency.

Conventionally, processing power methods such as the ion exchange resin method and the extraction method have been used to regenerate decontamination waste liquid, but in the case of the ion exchange resin method, the recovery rate of He and He was low and the regenerated liquid was large in ta. There was a risk that it would be generated and become secondary waste. In addition, the extraction method has drawbacks such as a low acid recovery rate of 50% to 70%, complicated equipment, and the use of a large amount of dangerous solvent.

In addition, since additives are added to Ryukaku'''F solution (decontamination solution) for the purpose of increasing inhibitors and decontamination effects, there is a risk that these substances may cause various inhibitions when using the above two methods. be.

The present invention was made in view of the above circumstances, and its purpose is to improve the acid recovery rate and reduce the amount of waste liquid required for treatment and disposal. It is an object of the present invention to provide an apparatus for regenerating de-dyed waste liquid which can reduce the amount of electricity and does not use dangerous solvents.

In order to achieve the above object, the present invention provides a diaphragm container made of a cationic ion exchange membrane in an electrolytic cell, an insoluble anode is installed on the outside of the diaphragm container, and an insoluble cathode is installed inside the diaphragm container. A system purification unit is formed, a plurality of these purification units are installed, and the volumes of the electrolytic cell and diaphragm container are set smaller than those of the previous purification unit, and the liquid inside the diaphragm container is transferred to the diaphragm container of the next purification unit. 7, and the liquid outside the diaphragm container is returned to the outside of the diaphragm container of the preceding purification unit.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The figure is a schematic diagram of a de-dyed waste liquid regeneration processing apparatus showing an embodiment of the present invention. A diaphragm vessel made of a cationic ion exchange membrane. Also, Wa No. 4-
An insoluble anode is installed outside the diaphragm container 3, and an insoluble cathode 5 is installed inside the diaphragm container 3. These electrolytic cell 1, diaphragm container 3. The insoluble anode 4 and the insoluble cathode 5 form diaphragm type purification units 6 to 8 of this device, and the electrolytic cell 1 and diaphragm container 3 of the name purification units 6 to 8 are set smaller than those of the preceding purification unit. ing.

In addition, each of these purification units 6 to 8 has an inlet pipe 9
The pipe L2 is connected to the next purification unit, and the return pipe L2 is connected to the next purification unit.
It is also connected to the previous stage purification unit via 0.

Therefore, the purification unit 6.7 introduces the liquid in the diaphragm container 3 to the outside of the diaphragm container 3 of the purification unit 7.8, and the purification units 8, 7 purify the liquid Y in the electric PN tank 1. It is adapted to be returned to the outside of the diaphragm container 3 of the unit 7.6. The liquid in the diaphragm container 3 of the purification unit 8 is discharged into the neutralization tank 12 through a discharge pipe 11. This neutralization tank 12 is designed to adjust the liquid iPIZ released from the purification unit 8 and then transfer it to a solidification device 13. I
Z: Oh, how much liquid was released from purification unit 8? A new electrolyte is supplied from the decomposition solution supply 1'14 to the electric supply unit 8 of the purification unit 8.

In addition, the purification unit 6 of this device includes an electrolyte 2V pump 1.
An electrolytic solution circulation system 16 is provided, and this electrolytic solution circulation system 16 is equipped with a filter device 17 for removing insoluble substances (for example, cladding, metal oxides, etc.) from the electrolytic solution. In the figure, 18.19 is a radioactive waste (metal waste) that is to be decontaminated. They are connected to the positive ntlI and negative sides, respectively.

Next, the operation of the above M4 configuration will be explained. An object to be decontaminated 18 immersed in the electrolyte 2 of the purification unit 6 .
When a predetermined amount of water is applied to 19, insoluble substances and metal ions are transferred from the surface of the object to be decontaminated into the electrolytic solution 2, and a decontamination operation is performed. As the decontamination progresses, the concentration of insoluble substances and metal ions in the electrolyte 2 increases, so to suppress this, the electrolyte circulation system 15 and purification unit 6 are operated in conjunction with the decontamination operation. do. As a result, the insoluble material in the electrolyte 2 is transferred to the filter device of the electrolyte circulation system 16 at 27 K.
Therefore, the metal ions are removed and permeate through the walls of the diaphragm container 3 by the insoluble anode 4 and the insoluble cathode 5 installed on the outside and inside of the diaphragm container 3, and are made into cotton inside the diaphragm container 3. and.

When the metal ion concentration in the diaphragm container 3 exceeds a certain level, scaling and generation of hydrogen occur due to the concentration difference with the electrolytic cell 1. Therefore, the concentrated liquid in the diaphragm container 3 is introduced by blowing 19 for the next purification. Transfer to Unit 7 Electrolysis Is 1.

Purification unit 7 performs a concentration operation of the same strain as purification unit 6, and metal ions! It is concentrated in the diaphragm container 3. Here, since the electrolytic cell 1 and the diaphragm container 3 of the purification unit 7 are set smaller than those of the purification unit 6, the diaphragm container 3
The concentration of metal ions within the tank can be increased from the Y purification unit 6. When the concentration of metal particles reaches a certain level, the metal particles are transferred to the electrolytic cell 1 of the next purification unit 8 through a special pot 9, and the same concentration operation is performed. In this way, by transferring the concentrated liquid in the diaphragm container 3 one after another to the downstream purification unit and remanipulating the concentration operation, the diaphragm container 3 of the 64-unit 8 can supply high-concentration a with a small amount of waste. A liquid is obtained. This is then passed through 11 discharge pipes to neutralization tank 1.
2, and after adjusting the pH, it is transferred to the solidification device 13 and solidified with cement or the like to prevent any deviation. Further, the amount of liquid discharged from the purification unit 8 is replenished with new electrolyte from the electrolyte supply pipe 14 to the electrolytic tank 1 of the purification unit 8, and this is successively passed through the return pipe 10 to the previous stage purification unit. 76
will be returned to. Note that the anions in the diaphragm container 3 do not permeate and migrate to the anode 4 side because the diaphragm container 3 is formed from a cationic ion exchange membrane.

As described above, according to this embodiment, since the electrolytic solution is concentrated in stages by a plurality of purification units, it is possible to reduce the amount of waste liquid that needs to be treated and disposed of. In addition, since this method only removes insoluble substances and metal ions, which are the target substances for waste liquid regeneration, from the electrolytic tank, the recovery rate is excellent! It can be achieved almost 100% and does not require the use of dangerous solvents. Furthermore, it is also possible to assemble the entire load into one set, and it is also possible to have a continuous arrangement.

Note that the present invention is not limited to the above embodiments,
It is also possible to implement the purification unit by arranging it in two or four or more stages.

As described above, according to the present invention, a diaphragm container made of a cationic ion exchange membrane is provided in an electrolytic cell, an insoluble anode is installed on the outside of the diaphragm container, and an insoluble cathode is installed inside the diaphragm container. A diaphragm type purification unit) Y is formed, and multiple purification units are installed in the above rectangle, $ 4.
% and the volume of the diaphragm container is set smaller than that of the preceding purification unit, and the liquid inside the diaphragm container is introduced to the outside of the diaphragm container of the next purification unit.
The liquid is returned to the outside of the diaphragm container of the preceding purification unit, so the recovery rate is high, the amount of waste liquid required for treatment and disposal can be reduced, and there is no need to use electricity, such as hazardous solvents. Raw treatment equipment for removing dyed waste liquid! Can be provided.

[Brief explanation of the drawing]

The figure is a schematic diagram of an electro-destaining waste liquid regeneration treatment apparatus according to a first embodiment of the present invention (not shown). DESCRIPTION OF SYMBOLS 1... Electrolytic cell, 3... Diaphragm container, 4... Insoluble anode, 5... Insoluble cathode, 6-8... Diaphragm type purification unit, 9... Introduction 1.10... Upon return, 12...
Neutralization tank, 16... Electrolyte circulation system, 17... Filter device.

Claims (1)

[Claims] A diaphragm container made of a cationic ion exchange membrane is provided in the electrolytic cell, an insoluble anode is installed on the outside of the diaphragm container, and a suspicious cathode is installed inside the diaphragm container to form a diaphragm type purification unit. After installing ρ units, the volume of the above electrolytic cell and diaphragm container! The liquid inside the diaphragm container is set to be smaller than that of the 411-stage purification unit, and the liquid inside the diaphragm container flows to the outside of the diaphragm container of the next purification unit, and the liquid outside the diaphragm container flows to the outside of the diaphragm container of the previous purification unit. 7. A regeneration treatment device for electrolytic dyeing waste liquid, which is characterized in that it is sent back.