Permeable in-situ leaching uranium mining leaching process for hydrochloric acid modified sand layer

Abstract

The invention belongs to the technical field of in-situ leaching uranium mining and particularly relates to a permeable in-situ leaching uranium mining leaching process for a hydrochloric acid modified sand layer. The purpose is to solve the technical problem that traditional mining processes of sulfuric acid in-situ leaching and alkaline in-situ leaching cannot meet mining requirements under the condition of decreasing of the uranium resource quality. In practical use, the leaching process is stable in control and compact in joining, liquid extracting and injecting capacity is improved, oxidation of uranium minerals is accelerated and achieved, uranium-containing leachate is obtained, and the condition of production concentration treatment in later period can be met. In the leaching mining process at a Shihongtan 1# mining area, by adopting the leaching process, the liquid injecting capacity is increased from 108 m<3> / h to 132 m<3> / h; oxygen is dissolved effectively and injected into the ore-containing sand layer, the oxygen content in the leachate is 18 mg / l, the average peak value of the uranium concentration of the leachate is 27.8 mg / l, and the uranium concentration peak value of a single well is 64 mg / l; and accordingly the effects that the uranium resource of the mining area is exploited, and the recovery rate of the uranium resource of the mining area reaches 76.5% are achieved.

Description

technical field [0001] The invention belongs to the technical field of uranium mining by in-situ leaching, and in particular relates to a uranium leaching process for improving the permeability of sand layers by hydrochloric acid. Background technique [0002] In the process of large-scale promotion of in-situ leaching uranium mining, the quality of resources is directly reflected in production costs, which is one of the factors that determine production investment decisions. With the depletion of superior resources, in-situ leaching uranium mining will face resource dispersion, sand However, the in-situ leaching and leaching process for developing this type of uranium resources has not yet formed a technical specification. On the premise that no breakthrough has been made in the development process of this type of uranium ore resources, the early acid in-situ leaching method is still used. Alkaline in-situ leaching, on the one hand, because the pumping liquid volume cannot ...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the traditional sulfuric acid in-situ leaching and alkaline in-situ leaching mining techniques cannot meet the mining requirements under the condition that the quality of uranium resources declines, and provides a method that can develop Uranium leaching process for hydrochloric acid-improved sand layer permeability in-situ leaching for complex uranium resources

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