Radioactive wastewater treatment method

A technology for radioactive wastewater and treatment method, applied in radioactive purification, nuclear engineering and other directions, can solve the problems of poor immobilization effect, high treatment cost, influence of pH value of wastewater, etc., and achieves good immobilization effect, good treatment effect and fixed The effect of simple method

Inactive Publication Date: 2015-09-23
DATANG INT HIGH ALUMINA COAL R & D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a radioactive wastewater treatment method, which is used to solve the technical defects of the prior art, such as the treatment method is easily affected by the pH value of the wastewater, the treatment cost is high, and the immobilization effect in the later stage is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Get 100 grams of high-alumina fly ash (alumina content of 48%, silicon oxide content of 35.5%), add 200 grams of sodium hydroxide solution with a mass percentage of 20% to it, mix well, and place the mixture in the In a reaction kettle lined with polytetrafluoroethylene, desiliconization reaction was carried out at a temperature of 90°C and a speed of 120r / min. After stirring for 2 hours, the reactant was taken out and filtered to obtain a desiliconization solution and filter residue; Wash once, filter and combine the filtrate into the desiliconization solution. Under the condition of constant stirring, add 60g of milk of lime to the combined desiliconization solution, stir and react at room temperature for 2 hours, stop stirring, let it settle and filter, and fully wash the calcium silicate filter cake to the pH of the washing solution If the value is lower than 11, collect the filter cake, centrifuge to remove water, and dry at 60°C to obtain fine powdered active calc...

Embodiment 2

[0035] The active calcium silicate prepared by 1g embodiment 1 is added to 200mL cobalt chloride solution (its initial pH value is 2.0, Co 2+ Concentration is 500mg / L), raise the temperature of the system to about 55°C, keep warm and shake for 5h, and then centrifuge; after testing, the pH value of the centrifuged supernatant is about 8, and the Co 2+ The concentration is 0.5mg / L, Co 2+The removal rate reaches 99.9%.

Embodiment 3

[0037] The active calcium silicate prepared by 2g embodiment 1 is added into 200mL containing cobalt chloride (Co 2+ ) and uranyl nitrate (UO 2 2+ ) mixed solution (its initial pH value is 2.0, Co 2+ The concentration is 500mg / L, UO 2 2+ Concentration is 500mg / L), raise the temperature of the system to about 45°C, keep warm and shake for 4 hours, and then centrifuge; after testing, the pH value of the centrifuged supernatant is about 7.5, and the Co 2+ The concentration is 0.8mg / L, UO 2 2+ The concentration is 0.5mg / L, Co 2+ and UO 2 2+ The removal rate reached above 99.8%.

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PUM

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Abstract

The invention provides a radioactive wastewater treatment method. The radioactive wastewater treatment method provided by the invention comprises the following steps: adding active calcium silicate to radioactive wastewater with the pH value of greater than or equal to 2, and then performing solid-liquid separation to obtain purified water and radioactive calcium silicate, wherein the grain diameter of the active calcium silicate is smaller than 50 [mu]m, the bore diameter is 2-50 nm, and the specific surface area is 400-700 m<2>/g. According to the radioactive wastewater treatment method provided by the invention, the active calcium silicate is taken as a treating agent, the active calcium silicate is not easy to be influenced by the water quality and pH value of wastewater when the radioactive wastewater is treated, and radioactive elements and other metal ions in the radioactive wastewater can be effectively removed under a smaller additive amount; and moreover, an immobilization method for the radioactive calcium silicate formed after treatment is simple, and the immobilization effect is good.

Description

technical field [0001] The invention relates to a method for treating radioactive elements, in particular to a method for treating radioactive waste water. Background technique [0002] At present, the methods for treating radioactive wastewater produced by nuclear power plants mainly include chemical precipitation, ion exchange, evaporation and concentration, membrane separation, and adsorption. [0003] The chemical precipitation method mainly converts radioactive elements into insoluble precipitates such as hydroxides, carbonates, and phosphates, and transfers and concentrates them into sludge. It is suitable for low-level wastewater that does not require high purification. However, this method has high requirements on the pH value of the wastewater during the treatment process, and the treatment effect is significantly affected by the impurities contained in the wastewater, and the quality of the radioactive sludge produced after treatment is relatively large (usually 1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/10
CPCG21F9/10
Inventor 孙俊民王毅伍泽广祁光霞雷雪飞
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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