Technique for reagent-free in situ leaching uranium mining from sandstone type uranium deposit

Abstract

The invention relates to a technique for reagent-free in situ leaching uranium mining from a sandstone type uranium deposit, which comprises the following steps: performing preoxidation on ore beds by injecting air; injecting industrial oxygen into the ore beds in the processes of extracting and liquid charging; and forming hexavalent uranium into a stable soluble complex in bicarbonate type ground water. The technique achieves the oxidation of the metallic uranium in the ore beds under the condition of not introducing chemical reagents of acid, alkali and the like so that the water-insoluble tetravalent uranium is converted into water-soluble hexavalent uranyl ions for the convenience of performing extraction on the ground surface; besides, the technique has the advantages of stable product quality, low production cost, no pollution of an extraction-injection balanced closed cycle, easy decommissioning treatment and the like.

Description

Technical field: [0001] The invention relates to a mining technology for a low-permeability in-situ leachable sandstone-type uranium deposit. Background technique: [0002] At present, there are mainly two methods of uranium mining at home and abroad: one is the heap leaching mining method for hard rock mining, and the other is the in-situ leaching uranium mining method for sandstone uranium deposit mining. In-situ leaching of sandstone-type uranium deposits usually adopts acid in-situ leaching or alkaline in-situ leaching for uranium mining. Among them, acid in-situ leaching uranium has a good oxidation effect, but it requires high investment costs and labor intensity. There are also disadvantages such as serious pollution to the stratum and the environment, and difficulty in decommissioning mines. Alkali leaching of uranium has problems such as unsatisfactory results. Invention content: [0003] The purpose of the present invention is to provide a reagentless uranium le...

AI Technical Summary

Problems solved by technology

In-situ leaching of sandstone-type uranium deposits usually adopts acid in-situ leaching or alkaline in-situ leaching for uranium mining. Among them, acid in-situ leaching uranium has a good oxidation effect, but it requires high investment costs and labor intensity. There are also disadvantages such as serious pollution to the stratum and the environment, and difficulty in decommissioning mines. Alkali leaching of uranium has problems such as unsatisfactory results.

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