Saturated resin hydrochloric acid protonation transformation water leaching process

Abstract

The invention discloses a saturated resin hydrochloric acid protonation transformation water leaching process. The process comprises the following steps that (1) an efficient leaching agent is selected so as to improve the leaching efficiency, reduce the uranium concentration of adsorption tail liquid, and prevent resin poisoning and tower blockage; (2) a proper eluting agent is selected to reduce the impurity content in the qualified liquid and improve the product quality; and (3) a proper leaching process is used so as to reduce the consumption of HCO3- in the in-situ leaching liquid. The process has the beneficial effects that the leaching effect is good, and the product quality is high, wherein since the leaching agent is clear water, impurity ions brought into qualified liquid are few, the product quality is greatly improved, and the grade is improved from 58-60% to about 72%; the operation is simple, and clean water is directly used for leaching; and preparation of the eluting agent is not needed, so that the consumption of raw materials (salt) is saved (zero).

Description

technical field [0001] The invention belongs to a leaching process, in particular to a saturated resin hydrochloric acid protonation transformation water leaching process. Background technique [0002] The leaching solution of in-situ leaching uranium mines has low uranium concentration and large flow rate, and ion exchange method is generally used to extract uranium. [0003] After the resin is saturated, the uranium on the resin needs to be rinsed off with an appropriate eluent, which is the reverse process of adsorption. For acid leaching, commonly used leaching agents are: acidic chloride solution (NaCl-H 2 SO 4 , NH 4 Cl-H 2 SO 4 ), acidic nitrate solution (HNO 3 -NaNO 3 , HNO 3 -NH 4 NO 3 , H 2 SO 4 -NH 4 NO 3 , H 2 SO 4 -NaNO 3 ), dilute nitric acid and dilute sulfuric acid, etc. Commonly used leaching agents for alkaline leaching are: NaCl-NaHCO 3 , NaCl-Na 2 CO 3 , NaNO 3 -NaHCO 3 Wait. Domestic acid mines generally use acidic nitrate leachin...

AI Technical Summary

Problems solved by technology

After a period of operation, the adsorption tail liquid is difficult to control, and the final eluent is changed to saturated saline plus about 3g / L NH 4 HCO 3 , in order to save hydrochloric acid, the pH value of the end point of protonation was increased to 4 to 4.5, but the problem still could not be solved. In addition to the high adsorption tail liquid, tower blockage and resin poisoning sometimes occurred. In order to completely solve such problems, it was proposed The uranium-saturated resin hydrochloric acid protonation transition water leaching process: the resin is transformed with hydrochloric acid after adsorption, and the resin returns to the adsorption after rinsing with water.

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