Diluted acid in-situ leaching uranium mining technology

A technology for in-situ leaching of uranium and technology, which is applied in the fields of mining fluids, earth-moving drilling, wellbore/well components, etc., and can solve the problems of low leaching efficiency, insufficient oxygen injection, and low production volume.

Active Publication Date: 2015-04-22
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Abstract
  • Description
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Problems solved by technology

[0004] However, many carbonate-cemented uranium deposits in my country have poor permeability, although 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.

Method used

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  • Diluted acid in-situ leaching uranium mining technology
  • Diluted acid in-situ leaching uranium mining technology
  • Diluted acid in-situ leaching uranium mining technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The average thickness of the ore body in the Nalinggou uranium deposit test area is 4.40m, the average grade is 0.0709%, and the average square meter uranium content is 6.38kg / m 2 , with an average buried depth of 400m. Average carbonate content in CO 2 That works out to be 3.41%.

[0026] Test blocks such as figure 1 As shown, dilute hydrochloric acid + oxygen leaching process is adopted, and the operation steps are detailed as follows:

[0027] Step 1, 20 days of circulating injection without adding reagents;

[0028] Step 2, on the 20th day, the temperature of the liquid injection system is 16° C., the pressure is 1 MPa, and 400 mg / l of oxygen is added. Concentrated hydrochloric acid was added online to keep the pH value of the solution at 3-4.

[0029] Step 3, Day 30, Leachate HCO 3 - When the concentration reaches 1g / l, the injection volume remains stable. Adjust the injection volume of concentrated hydrochloric acid to gradually increase the pH value of the...

Embodiment 2

[0035] Core samples collected from the Shashagetai uranium deposit, the ore sample is 0.0258%, CO 2 The content is 3.45%. Indoor dilute acid column leaching experiment, column length 113cm, column diameter 3.3cm, pore volume 340ml, porosity 35.2%, column bulk density 1.75g / cm 3 , true density 2.70g / cm 3 .

[0036] The experiment adopts the dilute hydrochloric acid + oxygen leaching process, the initial pH value of the injection solution is 3-4, and after 20 pore volumes, the permeability is 12 times higher than the initial permeability; after that, the pH value of the injection solution is adjusted to 4-5, and the pore volume is 15 Post-volume permeability increased 8-fold over initial permeability, HCO 3 - The concentration reaches 1g / l; then adjust the pH value of the injection solution to 5-6 until the leaching ends, 70 pore volumes are leached, and the uranium leaching rate reaches 64.85%.

Embodiment 3

[0038] The average thickness of the uranium deposit ore body is 4.82m, the average grade is 0.0875%, and the average uranium content per square meter is 9.02kg / m 2 , with an average buried depth of 180m. The well type adopts the five-point type, and the distance between the injection well and the extraction well is 15m.

[0039] The dilute hydrochloric acid + oxygen leaching process is adopted, and the pH value of the initial injection solution is 4-5. After 2 months, the leaching solution HCO 3 - The concentration increased from 250mg / l at the background to more than 1500mg / l; 5 extractions, 11 injections and 16 production wells dilute hydrochloric acid acidification leaching were all effective, and the maximum injection rate of the injection wells increased by 66.67%, with an average increase of 35.54%. Increased by 33.33%, with an average increase of 27.40% (Table 1).

[0040] Table 1 Changes of injection volume before and after dilute acid acidification in Shashagetai ...

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Abstract

The invention provides a diluted acid in-situ leaching uranium mining technology according to the characteristics of a carbonate cement low-permeability sandstone type uranium ore deposit. Diluted hydrochloric acid serves as a leaching agent and is injected into an ore bed in an online acid adding mode, the PH value of a leaching solution is kept between 3 and 6 so that carbonate in the ore bed can be quickly dissolved, HCO3- is generated on site, and leaching is promoted. The diluted acid in-situ leaching uranium mining technology has been used in in-situ leaching uranium mining experiments and production of the Shashagetai uranium ore deposit and the Nalinggou uranium ore deposit in Ordos, the liquid injection amount is remarkably increased, and the concentration of the HCO3- and the concentration of leaching liquid uranium are obviously increased.

Description

technical field [0001] The invention belongs to the technical field of uranium mining by in-situ leaching, and specifically relates to a method of using dilute hydrochloric acid as a leaching agent in an in-situ leaching uranium mining process to increase the pumping liquid volume and leachate HCO 3 - Concentration, to facilitate the process of leaching. 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 into the ore-bearing layer, and the injected leaching agent and oxidant will chemically react with the useful components in the ore to form Soluble compounds leave the chemical reaction zone under the action of diffusion and convection and enter the leachate flow that permeates and migrates along the ore seam to form leachate. [0003] The leaching process of uranium at a pH value of 6.0-8.0 is called neutral leaching. The l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/28C22B3/10C22B60/02
CPCC22B60/0204C22B60/0226E21B43/28
Inventor 江国平廖文胜原渊王立民周磊谢廷婷闻振乾
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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