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Method for direct mineral uranium fixation from acidic hexavalent uranium solution

An acidic, solution-based technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as inability to form stable uranium compounds, and achieve good curing effect, low cost, and simple process

Active Publication Date: 2021-08-31
EAST CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite uranium-containing wastewater detergent can only treat alkaline uranium-containing wastewater with low uranium ion content. The role of phosphate in it is mainly to cooperate with zeolite to adsorb uranium, and cannot form stable uranium compounds. Follow-up for How to deal with the decontamination agent after adsorbing uranium is another problem

Method used

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  • Method for direct mineral uranium fixation from acidic hexavalent uranium solution
  • Method for direct mineral uranium fixation from acidic hexavalent uranium solution
  • Method for direct mineral uranium fixation from acidic hexavalent uranium solution

Examples

Experimental program
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Embodiment 1

[0028] Such as figure 1 As shown, the method for direct mineral fixation of uranium from acidic hexavalent uranium solution includes: adding 100mL acidic hexavalent uranium solution (wherein the hexavalent uranium content is 83.2mg / L, pH is 1.07) according to the solid-liquid Add 0.25g of calcium phosphate salt (calcium hydrogen phosphate) at a ratio of 2.5:1g / L, and react for 4 minutes at a temperature of 60°C to fix the uranium in the mineral, so that the hexavalent uranium in the solution is adsorbed on the surface of the calcium phosphate salt particles and passes through the ore. The phase transformation is fixed to the target mineral, calcium-uranium mica, and after the reaction, the slurry is filtered, washed, and dried to obtain the calcium-uranium mica product.

[0029] The content of uranium detected in the filtrate obtained by filtering in this embodiment is almost 0, and the removal rate of uranium can reach 100%.

[0030] The present embodiment obtains the XRD fi...

Embodiment 2

[0032] Such as figure 1As shown, the method for direct mineral fixation of uranium from acidic hexavalent uranium solution includes: adding 100mL acidic hexavalent uranium solution (wherein the hexavalent uranium content is 83.2mg / L, pH is 1.07) according to the solid-liquid Add 0.25g of calcium phosphate salt (calcium hydrogen phosphate) at a ratio of 2.5:1g / L, and react for 4 minutes at a temperature of 90°C, so that the hexavalent uranium in the solution is adsorbed on the surface of the calcium phosphate salt particles and undergoes mineral phase transformation. The target mineral is fixed as the calcium uranium mica, and after the reaction, the slurry is filtered, washed and dried to obtain the calcium uranium mica product.

[0033] The content of uranium detected in the filtrate obtained by filtering in this embodiment is almost 0, and the removal rate of uranium can reach 100%.

Embodiment 3

[0035] Such as figure 1 As shown, the method for direct mineral fixation of uranium from acidic hexavalent uranium solution includes: adding 100mL acidic hexavalent uranium solution (wherein the hexavalent uranium content is 83.2mg / L, pH is 1.07) according to the solid-liquid Add 0.4g of calcium phosphate salt (calcium hydrogen phosphate) at a ratio of 4:1g / L, and react for 4 minutes at a temperature of 60°C, so that the hexavalent uranium in the solution is adsorbed on the surface of calcium phosphate salt particles and fixed by mineral phase transformation The target mineral is calcium uranium mica, and after the reaction, the slurry is filtered, washed and dried to obtain the calcium uranium mica product.

[0036] The content of uranium detected in the filtrate obtained by filtering in this embodiment is almost 0, and the removal rate of uranium can reach 100%.

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Abstract

The invention relates to a method for direct mineral uranium fixation from an acidic hexavalent uranium solution, and belongs to the technical field of uranium-containing wastewater treatment. The method comprises the following steps: adding calcium phosphate into an acidic hexavalent uranium solution according to a solid-to-liquid ratio of (0.5-5.0): 1 g / L, and conducting reacting for 1-100 minutes at the temperature of 30-90 DEG C, so as to adsorb hexavalent uranium in the solution on the surfaces of particles of the calcium phosphate and fix the hexavalent uranium into a target mineral, namely calcium-changed uranium mica through mineral phase transformation; and after the reaction is finished, filtering the slurry, and conducting washing and drying to prepare a mixed product of the calcium-variable uranium mica and the calcium phosphate. According to the invention, TCLP toxic leaching with the pH being 4.98 is carried out on the mixed product, the result shows that the uranium-containing solid product has high leaching stability, the uranium concentration in the leachate is lower than 0.1 mg / L, and the uranium-containing solid waste safe stockpiling standard in the uranium mining and metallurgy facility decommissioning environment management technical regulation (GB 14586-93) can be met.

Description

technical field [0001] The invention relates to a method for directly mineral-fixing uranium from an acidic hexavalent uranium solution, and belongs to the technical field of uranium-containing wastewater treatment. Background technique [0002] Nuclear pollution is a form of pollution that seriously threatens the safety of human life. In the past 30 years, with the vigorous development of my country's nuclear industry, severe nuclear pollution problems have also been brought about. The most direct and serious one is the pollution of groundwater and soil by high-concentration uranium-containing wastewater from in-situ leaching of uranium mines. [0003] At present, the main methods for treating such high-concentration uranium-containing wastewater include: reduction and solidification of zero-valent iron, ion exchange, flocculation, chemical adsorption, biosorption, electrodeposition, and mineral uranium fixation. [0004] For example, patent application number 201810774755...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
CPCC01B25/45C01P2002/72C01P2002/80C01P2004/03
Inventor 柯平超吴天楠刘亚洁周仲魁郑志宏王学刚孙占学刘超解原
Owner EAST CHINA UNIV OF TECH
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