Ion exchange adsorption process of uranium leaching solution plus CO2 under pressure

Abstract

The invention provides a uranium leaching solution plus CO2 pressure ion exchange adsorption process. Before the uranium leaching solution is filtered and ion exchange adsorption treatment, CO2 gas is added to the uranium leaching solution, and the amount of CO2 added is controlled to be 200-400mg / L and the pressure is 0.5 ~0.7MPa, it can adjust the pH value of the uranium leach solution in the range of 6.2-7.9; within this pH value range, the ratio of low-valence uranium complex anions in the uranium complex in the leach solution increases, thus significantly improving the resin Saturated uranium capacity, and effectively slow down the hardening speed of the resin layer during adsorption. At the same time, the concentration of bicarbonate in the tail liquid is increased to form an effective leaching agent, which can be injected into the ground for recycling. Compared with the traditional acid-base leaching process, the invention integrates the two processes of ion exchange adsorption and leaching solution preparation, simplifies the operation steps, improves the saturated uranium capacity of the resin, and optimizes the production process technology.

Description

Uranium leach solution plus CO 2 Pressurized ion exchange adsorption process technical field The present invention relates to uranium hydrometallurgy process, be specifically related to one kind of leach liquor of uranium plus CO2 pressure ion exchange adsorption process method. Background technique [0002] The in-situ leaching uranium mining process is composed of underground leaching and leachate treatment. Metallic composition in underground ore bodies After the action of the leaching solution, a leaching solution containing uranium metal is formed, which is sent to the adsorption tower for adsorption after pretreatment. Use from The process by which a sub-exchange resin removes soluble ions from solution, often called adsorption in uranium technology, i.e. the activity on the resin The group and the complex ion of uranium in the solution undergo an exchange reaction, the uranium in the solution is adsorbed on the resin, and the ions on the resin enter into...

AI Technical Summary

Problems solved by technology

This method satisfies the requirements of production better, but requires an independent preparation process of immersion solution, resin