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Method for in-situ leaching of uranium by low concentration sulfuric acid and oxygen

An in-situ leaching, low-concentration technology, applied in the field of uranium mining by in-situ leaching, can solve problems such as groundwater pollution and chemical blockage, and achieve the effects of reducing pollution, reducing concentration and total amount, and reducing production costs

Active Publication Date: 2015-06-24
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, chemical clogging is also prone to occur during the leaching process and cause groundwater pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The in-situ leaching uranium mining process with low concentration sulfuric acid and oxygen includes the following process steps:

[0021] 1. Extract groundwater for chemical composition analysis

[0022] Extract the groundwater from the ore layer and analyze the groundwater composition, mainly to determine the salinity of the groundwater and the Cl in the groundwater. - concentration.

[0023] The analysis results show that the type of groundwater chemistry is SO 4 ·HCO 3 -Ca·Mg type, salinity is 0.76g / L. ρ(Ca 2+ ) is 130.5mg / L, ρ(Mg 2+ ) is 57.5mg / L, ρ(SO4 2- ) is 230mg / L, ρ(Cl - ) is 124.2mg / L, ρ(HCO 3 - ) was 130.5 mg / L, the pH value was 7.34, and the Eh value was 314 mV.

[0024] The groundwater salinity of the deposit is less than 5g / L, and the groundwater Cl - The concentration is less than 2g / L, which is in line with the conditions of in-situ leaching of uranium mining with low-concentration sulfuric acid and oxygen.

[0025] 2. Oxygen injection oxid...

Embodiment 2

[0036] The in-situ leaching uranium mining process with low concentration sulfuric acid and oxygen includes the following process steps:

[0037] 1. Extract groundwater for chemical composition analysis

[0038] Extract the groundwater from the ore layer and conduct component analysis, mainly to determine the salinity of groundwater and the Cl in groundwater - concentration.

[0039] The analysis results show that the type of groundwater chemistry is SO 4 ·Cl-Na type, the salinity is 1.48~1.73g / L. ρ(Ca 2+ ) is 7.13mg / L, ρ(Mg 2+ ) is 0.73mg / L, ρ(SO 4 2- ) is 464.93mg / L, ρ(Cl - ) is 324.37mg / L, ρ(HCO 3 - ) was 245.95 mg / L, the pH value was 7.25, and the Eh value was 282 mV.

[0040] The groundwater salinity of the deposit is less than 5g / L, and the groundwater Cl - The concentration is less than 2g / L, which is in line with the conditions of in-situ leaching of uranium mining with low-concentration sulfuric acid and oxygen.

[0041] 2. Oxygen injection oxide layer

[0...

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Abstract

The invention relates to a method for in-situ leaching of uranium by low concentration sulfuric acid and oxygen. In-situ leaching of metal uranium from ore beds relates to a process of recovering uranium from uranium ore deposits with non-uniformly distributed carbonate content. The method includes groundwater chemical composition analysis, oxygen injection and oxidation of ore bed, preparation of leaching solution, leaching of metal uranium by leaching solution, leaching maintaining, resin adsorption and other steps. The method can be applied to uranium ore deposits with non-uniformly distributed carbonate content to effectively control chemical clogging and improve the leaching efficiency of in-situ uranium mining. Compared with conventional acidic in-situ leaching of uranium, the method alleviates pollution to mining area groundwater environment. Effects of the leaching process by low concentration sulfuric acid and oxygen show that the method is an effective process for in-situ leaching of uranium.

Description

technical field [0001] The invention belongs to the technical field of in-situ leaching and mining of uranium, and particularly relates to a method for in-situ leaching and mining of uranium with low-concentration sulfuric acid and oxygen. Background technique [0002] In-situ leaching uranium mining (referred to as in-situ leaching uranium mining) is to inject a solution 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 solution and the useful components in the ore A chemical reaction occurs in the contact, and the generated soluble compounds leave the chemical reaction zone under the action of diffusion and convection and enter the solution flow that penetrates and migrates along the ore layer to form a leachate; the leachate is lifted from the pumping well to the surface through the ore layer, and the extracted leachate is transported to the recovery workshop Processes su...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B3/08C22B3/24
Inventor 原渊王海峰李建华王立民廖文胜程威周磊
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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