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Ion exchange method for gas generation in uranium extraction process

A technology for ion exchange and extraction process, which is applied in the field of ion exchange where gas is generated in the uranium extraction process, and can solve the problems of increased dosage of transformation agent, more waste water, and reduced saturated working capacity.

Active Publication Date: 2021-04-20
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since carbonate radicals and acids are prone to react to generate gas, it will have adverse effects on actual operation, adsorption, leaching, and transformation effects.
For example, when gas is generated during adsorption, leaching, and transformation, it will cause uneven distribution of liquid, loose resin layer, increase in mass transfer zone height, back-mixing of solution, destruction of gradient, decrease of eluent concentration, and easy penetration of adsorption , the saturated working capacity is reduced, the amount of leaching and transformation agent is increased, and the waste water is more

Method used

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  • Ion exchange method for gas generation in uranium extraction process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Weakly basic anion resin is used to adsorb uranium in a certain carbonate system, and the carbonate is leached.

[0065] The solution was adjusted to pH 6.0 by adding sulfuric acid. Fixed-bed 5-column adsorption in series. The bed height is 60% of the effective height in the tower, and the contact time for a single tower is 10 minutes. The liquid is fed from the top, and the top of the tower is exhausted. The height of the liquid level is controlled at 85-95% of the tower height, and the exhaust control P1 / P0≥95%. The first tower adsorption tail liquid is dynamically adjusted to pH 6.0. The concentration of uranium in the adsorption tail liquid of the fourth tower reaches 1mg / L, and the first tower is cut out, and the bottom liquid of the fifth tower is circulated and exhausted. The looseness of the exhaust bed is 1.4. The tower is used, and then the tail is cut into the new tower after transformation and washing. The uranium concentration of the loaded resin is 70m...

Embodiment 2

[0068] Weakly basic anion resin is used to adsorb uranium in a sulfuric acid system, and carbonate leaching is used.

[0069] Fixed-bed 5-column adsorption in series. The bed height is 70% of the effective height in the tower, and the contact time for a single tower is 5 minutes. The liquid is fed from the top, and the top of the tower is exhausted. The height of the liquid level is controlled at 90-95% of the tower height, and the exhaust control P1 / P0≥90%. The first tower adsorption tail liquid is dynamically adjusted to pH ≤ 2.0. The concentration of uranium in the adsorption tail liquid of the 4th tower reaches 1mg / L, the first tower is cut out, and the bottom of the 5th tower is circulated and exhausted. The looseness of the exhaust bed is 1.2. The tower is used, and then the tail is cut into the new tower after transformation and washing. The uranium concentration of the loaded resin is 100mg / ml.

[0070] Use the eluting qualified liquid to carry out circular elutria...

Embodiment 3

[0074] Use weakly acidic cationic resin to adsorb uranium in a certain carbonate system, and rinse with hydrochloric acid.

[0075] The solution was adjusted to pH 6.0 by adding sulfuric acid. Fixed-bed 6-column adsorption in series. The bed height is 50% of the effective height in the tower, and the contact time for a single tower is 10 minutes. The liquid is fed from the top, and the top of the tower is exhausted. The height of the liquid level is controlled at 85-95% of the tower height, and the exhaust control P1 / P0≥85%. The first tower adsorption tail liquid is dynamically adjusted to pH 6.0. The concentration of uranium in the adsorption tail liquid of the fifth tower reaches 1mg / L, and the first tower is cut out, and the lower inlet liquid of the sixth tower is circulated and exhausted. The looseness of the exhaust bed is 1.8. The tower is used, and then the tail is cut into the new tower after transformation and washing. The uranium concentration of the loaded resi...

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Abstract

The invention relates to the field of uranium hydrometallurgy, in particular to an ion exchange method for gas generation in the uranium extraction process. The ion exchange method comprises the following steps: connecting N ion exchange towers in series, adsorbing to-be-treated liquid, and controlling the pH value of adsorption tail liquid of a first tower; in the adsorption process, carrying out exhausting; cutting out after the first tower is saturated, circularly exhausting the Nth ion exchange tower in a liquid inlet form by utilizing the discharged liquid, and adsorbing after exhausting; cutting tail into a new tower; for the cut-out first tower, carrying out leaching in a manner that qualified leaching liquid enters the first tower for circular leaching, and then adopting upper liquid inlet nested circular leaching or upper liquid inlet series counter-current leaching; emptying liquid from the leached ion exchange tower, transforming, and exhausting from the top of the tower; and emptying liquid from the transformed ion exchange resin tower, washing, and using the washed ion exchange tower for adsorption. The invention improves the influence of gas on operation, ensures higher gradient, enhances the resin capacity, enhances the leacheate concentration and reduces the wastewater volume.

Description

technical field [0001] The invention relates to the field of uranium hydrometallurgy, in particular to an ion exchange method with gas generation during the uranium extraction process. Background technique [0002] The extraction technology of uranium in the field of uranium hydrometallurgy is mainly to extract uranium from sulfuric acid system and carbonate system. In sulfuric acid or carbonic acid system, uranium is easier to complex with sulfate or carbonate to form an anion complex. In the sulfuric acid system, D201x7 strong basic anion resin is generally used to adsorb the sulfate anion complex of uranyl, and then rinsed with acidic sodium chloride or nitrate, the acid can ensure that the uranium does not precipitate. In the carbonate system, D201x7 strong basic anion resin is generally used to absorb the carbonate anion complex of uranyl, and then the sodium chloride in the carbonate system is used for eluting. The carbonate can be complexed with uranium to ensure tha...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B3/42C22B3/24
CPCY02P10/20
Inventor 周志全牛玉清任燕曹笑豪常喜信曹令华叶开凯张永明赵凤岐舒祖骏
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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