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Method for preparing U3O8 from uranium-containing sodium carbonate solution

A technology of sodium carbonate and solution, which is applied in the field of uranium water smelting, can solve the problems of ammonium carbonate leaching and crystallization blockage, and achieve the effects of improving crystallization and impurity removal, avoiding bed blockage, and increasing uranium concentration

Active Publication Date: 2020-08-18
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the above deficiencies, the main purpose of the present invention is to provide a method for preparing U from uranium-containing sodium carbonate solution. 3 o 8 The method can have better impurity removal effect and prepare qualified uranium products from sodium carbonate solution; adopt this method to avoid the problem of chlorine-containing wastewater; adopt this method to realize recycling of ammonia and avoid the problem of ammonia-containing wastewater; adopt This method can solve the problem of ammonium carbonate elution crystallization clogging

Method used

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  • Method for preparing U3O8 from uranium-containing sodium carbonate solution
  • Method for preparing U3O8 from uranium-containing sodium carbonate solution
  • Method for preparing U3O8 from uranium-containing sodium carbonate solution

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Embodiment 1

[0032] Such as image 3 As shown, a preparation of U from uranium-containing sodium carbonate solution 3 o 8 method, including the following steps:

[0033] Such as figure 1 Shown, step 1, sodium carbonate system high-capacity resin adsorption;

[0034] a) Adjust the uranium-containing carbonate solution by adding NaOH or H 2 SO 4 or CO 2 or NaHCO 3 or Na 2 CO 3 , or other acids and bases, adjust the pH value to 9-10.5, and increase the resin adsorption capacity under this system through pH adjustment.

[0035] b) Using strong basic resin to adsorb uranium in the adjusted solution at room temperature, washing the saturated resin with water, and returning the adsorption tail liquid and washing liquid.

[0036] Such as figure 2 As shown, step 2, rinsing without crystalline ammonium bicarbonate;

[0037] Preheat the resin tower and keep it warm to keep the temperature stable at a certain value t1, which is between 35 and 50°C. Use hot ammonium bicarbonate rinse agen...

Embodiment 2

[0046] (1) A sodium carbonate solution containing uranium is the carbonate eluent of the resin. The uranium concentration is 4g / L, the total carbonate is 1mol / L, and the pH=9. Add NaOH to adjust the pH to 10, and use 201×7 resin to adsorb the adjusted solution. The resin capacity after adsorption is 54mg / ml. After the adsorption tail liquid is drained from the resin tower, the resin is washed with water, and the washing volume is 1BV , to obtain a saturated resin. The adsorption tail liquid and washing liquid are returned to the pre-adsorption process.

[0047] The saturated resin is rinsed with ammonium carbonate, and the cycle rinse process is applied 3 times. Before rinsing, the resin tower is heated and kept at 40°C, the pipeline is heated, and the eluent is heated to 40°C before feeding. The eluent concentration is 110g / LNH 4 HCO 3 +30g / L(NH 4 ) 2 CO 3. The eluting qualified liquid enters the cooling crystallization tank, and slowly stirs to cool down to room tem...

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Abstract

The invention belongs to the technical field of uranium ore hydrometallurgy, and particularly relates to a method for preparing U3O8 from a uranium-containing sodium carbonate solution, which comprises the following steps: step 1, adsorbing a sodium carbonate system by using high-capacity resin; step 2, leaching non-crystalline ammonium bicarbonate; 3, carrying out double-part crystallization; step 4, performing ammonia distillation circulation technology; by adopting the technical process, the qualified U3O8 product is prepared. PH adjustment is adopted, so that the resin adsorption capacityis improved, the uranium concentration is improved, and the ammonia distillation treatment capacity is reduced; by adopting the recommended process parameters and equipment, the problems of bed blockage and pipeline blockage in the ammonium bicarbonate leaching process are avoided. A double-part crystallization process is adopted, so that the crystallization efficiency is improved, the crystal form is good, and the crystallization and impurity removal effects are improved. By adopting the process, ammonia-free and chlorine-free emission is realized, and ammonia is completely circulated.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy of uranium ores, in particular to a method for preparing U 3 o 8 Methods. Background technique [0002] Currently preparing U 3 o 8 Most of the methods are prepared from sulfuric acid solution containing uranium, and prepared U from sodium carbonate solution. 3 o 8 technology is less. [0003] For the sodium carbonate alkaline leaching solution of uranium ore, there is a method to directly add NaOH to precipitate to obtain SDU (sodium diuranate). 3 o 8 , the SDU is then acid-dissolved and ammonia-precipitated to prepare ADU and then calcined to obtain U 3 o 8 . This method has poor impurity removal effect, and impurities such as sodium are easy to exceed the standard. [0004] For sulfuric acid systems, resin adsorption can generally be used. However, if the system adopts resin adsorption, there are certain difficulties. Sodium carbonate can generally be used as a eluting agen...

Claims

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Application Information

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IPC IPC(8): C01G43/01
CPCC01G43/01C01G43/003
Inventor 周志全任燕曹令华牛玉清常喜信邓慧东赵凤岐舒祖骏曹笑豪叶开凯
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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