A backwashable filter system and method for uranium mining by in-situ leaching

Abstract

The invention relates to a backwashing filter system and method for uranium mining by in-situ leaching. The system includes a filter device, a static mixer, a gas bag, a liquid injection container, a pressure stabilizing valve, a check valve, a gas flow meter, An electromagnetic flowmeter and a flow regulating valve; the method includes the following steps: step 1, solution analysis; step 2, normal filtration; step 3, backwashing operation. The invention determines the filter diameter of the filter element through the analysis of the leachate to ensure the filtration accuracy to the greatest extent; the use of the leaching injection liquid for backwashing avoids the waste of uranium metal caused by the use of the raw liquid, and effectively utilizes the pressure of the injection liquid in the system without adding a separate pump ;Using SV static mixer, the mixing effect is good, the recoil is thorough, and the speed is fast; the air is fed through the mixer main pipe, and the gas-liquid mixing recoil filter element is carried out with a large gas-liquid ratio, which greatly reduces the recoil water volume. The system and process have achieved good filtering and recoil effects in ground leaching practice, and the system is easy to automate.

Description

technical field [0001] The invention belongs to the field of in-situ leaching and mining of uranium, and particularly relates to a backwashing filtering system and method for in-situ leaching and mining of uranium. Background technique [0002] In-situ leaching of uranium extracts the leaching liquid from the ground through continuous pumping and liquid injection, and re-injects the leaching agent into the ground after adsorption. Due to hydrodynamic and chemical effects, there are certain solids in the leachate. In order to ensure that the resin bed is not polluted and the pores of the underground mine are not blocked, it is necessary to filter the liquid before the leachate enters the resin tower and before the leaching agent is injected into the underground mine. [0003] In-situ leaching of uranium is currently filtered by bag filters. The bag filter has a simple structure and low investment, which can ensure proper filtration precision. However, the bag filter has a ...

AI Technical Summary

Problems solved by technology

However, the above method should not be too complicated and difficult to automate when filtering the ground leaching solution, or the effect is not good.

[0005] In addition, uranium mining by in-situ leaching mainly filters the leaching solution or leaching agent. If the filtered leaching solution is used for recoil, it will not only waste the uranium metal in the leaching solution, but also increase the burden on the evaporation pool and increase the risk of radioactive contamination.

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