In-situ leaching uranium mining method by using mixing organic acidity as leaching agent

Abstract

The invention discloses an in-situ leaching uranium mining method by using mixing organic acidity as a leaching agent, which is characterized in that oxalic acid and citric acid are taken as the leaching agent, the leaching agent is injected into an ore bed by using an on-line mode addition mode, pH value of an immersion liquid is kept at 3-6, so that an organic matter for coating metal uranium can be dissolved, and leaching can be promoted; in addition, when the carbonate in the ore bed is corroded by oxalic acid and citric acid, its organic function group generates complexation with elements such as calcium, magnesium and iron in ore without deposition generation, on one hand, leaching reaction can be continuously carried out, on the other hand, penetration performance of the ore bed can be increased, and liquid injection amount of the boring is obviously increased. The method can be used in Ordos uranium deposit in-situ leaching uranium mining tests and production, liquid injection amount is obviously increased, and uranium concentration of leachate is obviously increased.

Description

technical field [0001] The invention belongs to the technical field of in-situ leaching uranium mining, and in particular relates to a process for using mixed organic acids as leaching agents in the in-situ leaching uranium mining process of sandstone uranium ores containing percarbonate and organic matter. Background technique [0002] In-situ leaching uranium mining is to inject a leaching agent prepared in a certain proportion into the ore layer through a liquid injection well drilled from the surface to the ore-bearing layer, and the injected leaching agent and oxidant will chemically react with the useful components in the ore to form soluble The compound leaves the chemical reaction zone under the action of diffusion and convection and enters the leachate flow that permeates and migrates along the ore seam to form leachate. [0003] In recent years, a number of in-situ leaching sandstone uranium deposits with large reserves have been proven in many parts of Inner Mongo...

AI Technical Summary

Problems solved by technology

[0004] For this type of sandstone uranium deposit, if the traditional acid method (generally using sulfuric acid as the leaching agent) is used for mining, on the one hand, due to the high content of carbonate, the acid consumption is relatively high, which is not suitable for the economical development of uranium deposits. At the same time, a large amount of carbon dioxide gas and calcium sulfate precipitation will be produced during acid leaching, which will cause serious blockage of the ore-bearing layer, resulting in the failure of normal mining of the entire uranium deposit

[0005] while using CO 2 +O 2 When the leaching process is mined, although the CO 2 The addition of can partially improve the formation permeability, but it is still difficult to greatly increase the production of process holes

On the one hand, this makes the leaching efficiency low. On the other hand, due to the low production volume and insufficient oxygen injection, the concentration of uranium in the leach solution is low.

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