Using method of organic chlorine oxidant in neutral in-situ leaching uranium mining

A technology for in-situ leaching and mining of uranium and oxidant, applied in the field of in-situ leaching and mining of uranium, can solve the problems of difficult mixing, gas blockage, low oxygen solubility, etc., and achieve the effect of obvious oxidation effect.

Pending Publication Date: 2020-02-11
BEIJING RES INST OF CHEM ENG & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The following problems were found during use. The solubility of oxygen in water is small, it is difficult to mix with groundwater, and the solubility is limited by the confined water head of groundwater. When used in low-permeability deposits, gas blockage may occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The ore body of a uranium deposit is mainly plate-shaped, the average thickness of the ore body is 2.0-4.5m, the average grade is 0.020%, and the average uranium content per square meter is 2.083kg / m 2 , the average carbonate content is 4.03%, suitable for neutral leaching process.

[0022] The first step: the concentration of bicarbonate in the groundwater is 1800mg / L, inject carbon dioxide and oxygen into the groundwater to prepare the leaching agent, the concentration of carbon dioxide is 300mg / L, the concentration of oxygen is 400mg / L, and the pH value of the leaching agent is about 7.2;

[0023] Step 2: When the concentration of uranium in the leaching solution reaches the peak value of 38.2 mg / L, stop adding oxygen after 10 days. Add sodium dichloroisocyanurate as an oxidant, and the prepared sodium dichloroisocyanurate solution is added to the injection main pipe through a metering pump, with a mass concentration of 220mg / L;

[0024] The third step: monitor the ...

Embodiment 2

[0027] The ore body of a uranium deposit is mainly plate-shaped, the average thickness of the ore body is 6.19m, the average grade is 0.042%, and the average uranium content per square meter is 4.83kg / m 2 , the average carbonate content is 2.58%, suitable for neutral leaching process.

[0028] The first step: the concentration of bicarbonate in the groundwater is 400mg / L, inject carbon dioxide and oxygen into the groundwater to prepare the leaching agent, the concentration of carbon dioxide is 600mg / L, the concentration of oxygen is 500mg / L, and the pH value of the leaching agent is about 6.8;

[0029] Step 2: When the concentration of uranium in the leaching solution reaches the peak value of 56.2mg / L, stop adding oxygen after 10 days. Sodium dichloroisocyanurate was added as an oxidant, and the prepared sodium dichloroisocyanurate solution was added into the liquid injection main pipe through a metering pump, with a mass concentration of 260mg / L;

[0030] The third step: mo...

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Abstract

The invention belongs to the technical field of in-situ leaching uranium mining, and particularly relates to a using method of an organic chlorine oxidant in neutral in-situ leaching uranium mining. Carbon dioxide and oxygen are injected into groundwater to prepare a leaching agent, and the pH value of the leaching agent is controlled to be 6.8-7.5; the concentration of the leach liquor uranium does not increase any more when reaching a peak value, and the oxygen stops being added; sodium dichloroisocyanurate is added as an oxidant, the prepared sodium dichloroisocyanurate solution is added into a liquid injection main pipe through a metering pump, and the mass concentration is 200-300 mg / L; the free chlorine concentration of a leach liquor is monitored, and when the free chlorine concentration is greater than 20 mg / L, the mass concentration of the oxidant sodium dichloroisocyanurate is reduced to 30-40% of the original concentration, namely, 60-120 mg / L; when the leaching rate of a block section is greater than 70%, the oxidant stops being added until the leaching process is finished. The using method can overcome the defect that the neutral leaching uranium mining adopts the oxygen as the oxidant, the tetravalent uranium in the ore is effectively oxidized, the concentration of the leach liquor uranium is improved, and the leaching period of the ore is shortened

Description

technical field [0001] The invention belongs to the technical field of in-situ leaching uranium mining, and in particular relates to a method for using an organic chlorine oxidant in neutral leaching uranium mining. Background technique [0002] Neutral in-situ leaching uranium mining is suitable for sandstone-type uranium deposits with high carbonate content. It has the advantages of low leaching cost, high uranium concentration in the leach solution, and environmental protection. It is mainly used in in-situ leaching production in my country and the United States. The uranium minerals in sandstone-type uranium deposits exist in the tetravalent form, and oxidants need to be added to oxidize the tetravalent uranium to hexavalent. The neutral in-situ leaching mines in my country usually use O 2 as an oxidizing agent. Under standard conditions, the density of oxygen is 1.429g / L, and it can be dissolved in water, but the solubility is very small. During the leaching process, ...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B3/04
CPCC22B3/04C22B60/0221
Inventor 邓锦勋原渊成弘许影赵利信李建华周根茂程威
Owner BEIJING RES INST OF CHEM ENG & METALLURGY
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