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Air pre-oxidizing method for in-situ leaching uranium extraction

A technology for in-situ leaching and pre-oxidation of uranium is applied in the field of in-situ leaching of uranium, which can solve the problems of difficulty in leaching, high oxygen consumption, serious dilution of leaching agents, etc., so as to reduce the consumption of reagents, strengthen the leaching effect, and reduce the dilution effect.

Active Publication Date: 2020-01-21
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

The development of such deposits often has serious dilution of leaching agents, high oxygen consumption, and relatively difficult leaching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] An in-situ leaching uranium deposit with a buried depth of about 330 meters, a well type of 5 points, a well spacing of 25 meters, a 10-meter-thick aquifer in the upper part of the mine, and an average porosity of 40%.2 +O 2 Craft mining. Its air pre-oxidation is implemented according to the following steps:

[0062] Step 1: Estimate the total pre-oxidation air requirement

[0063] According to the pore volume V of the aquifer in the upper part of the ore seam, multiplied by the ore pressure P and the porosity correction coefficient γ, the gas injection rate is estimated:

[0064] P×V×γ×10=P×(H×S×Φ)×γ×10

[0065] In the formula, the pressure is 3.2 MPa, and the porosity correction coefficient is 0.1. After calculation, the pore volume of the aquifer in the upper part of the mine seam is about 5000m 3 , need 16000m 3 Air.

[0066] Step 2: Select injection wells

[0067] The minimum liquid injection volume of each liquid injection well in the test area is greater t...

Embodiment 2

[0078] An in-situ leaching uranium deposit with a burial depth of about 320 meters, a well type of 5 points, a well spacing of 25 meters, an upper aquifer of 100 meters in thickness, and an average porosity of 30%. 2 +O 2 Craft mining. Its air pre-oxidation is implemented according to the following steps:

[0079] Step 1: Estimate the total pre-oxidation air requirement

[0080] According to the pore volume V of the aquifer in the upper part of the ore seam, multiplied by the ore pressure P and the porosity correction coefficient γ, the gas injection rate is estimated:

[0081] P×V×γ×10=P×(H×S×Φ)×γ×10

[0082] In the formula, the pressure is calculated as 2.7MPa, and the porosity correction coefficient is calculated as 0.05. After calculation, the pore volume of the aquifer in the upper part of the mine seam is about 37500m 3 , need 50625m 3 Air.

[0083] Step 2: Select injection wells

[0084] The minimum liquid injection volume of each liquid injection well in the te...

Embodiment 3

[0095] An in-situ leaching uranium deposit with a burial depth of about 350 meters, a well type of 5 points, a well spacing of 30 meters, a 15-meter-thick aquifer in the upper part of the ore seam, and an average porosity of 35%. 2 +O 2 Craft mining. Its air pre-oxidation is implemented according to the following steps:

[0096] Step 1: Estimate the total pre-oxidation air requirement

[0097] According to the pore volume V of the aquifer in the upper part of the ore seam, multiplied by the ore pressure P and the porosity correction coefficient γ, the gas injection rate is estimated:

[0098] P×V×γ×10=P×(H×S×Φ)×γ×10

[0099] In the formula, the pressure is 3.4 MPa, and the porosity correction coefficient is 0.2. After calculation, the pore volume of the upper aquifer of the mine seam is about 9450m 3 , need 64260m 3 Air.

[0100] Step 2: Select injection wells

[0101] The minimum liquid injection volume of each liquid injection well in the test area is greater than 1....

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Abstract

The invention relates to the technical field of in-situ leaching uranium extraction and particularly discloses an air pre-oxidizing method for in-situ leaching uranium extraction. The air pre-oxidizing method comprises the following steps of firstly, estimating the total demand of pre-oxidizing air, secondly, selecting an injection well, thirdly, performing air pre-oxidizing and fourthly, finishing pre-oxidizing. Through gas-liquid mixing, air is adopted as an oxidant, so that the uranium mineral can be quickly oxidized, and the leaching effect is enhanced.

Description

technical field [0001] The invention belongs to the technical field of in-situ leaching uranium mining, and in particular relates to an air pre-oxidation method for in-situ leaching uranium mining. Background technique [0002] In the process of in-situ leaching uranium mining, O 2 As an oxidant, it oxidizes tetravalent uranium minerals into soluble hexavalent uranium. However, O 2 The solubility in water is small, the dissolution rate is slow, and it is easy to become small bubbles in the ore layer. Due to the low gas density, the insoluble oxygen bubbles will float up in the ore seam and gradually consume in the upper part of the ore seam, which increases the dilution of the leaching agent and the oxygen consumption. For uranium deposits with thin ore seams, thick aquifers and good permeability, the consumption of oxygen is very large. [0003] Using air pre-oxidation, that is, injecting a large amount of air into the ore layer, and reducing oxygen consumption by empty...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B3/04C22B1/00
CPCC22B1/00C22B3/04C22B60/0221
Inventor 廖文胜谭亚辉王立民杜志明
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY