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In-situ uranium leaching and mining treatment method by adding O2 into CO2

A technology of in-situ leaching and treatment method, which is applied in the fields of mining fluids, earth-moving drilling, wellbore/well components, etc. It can solve the problems of clogging of underground ore-bearing aquifers and groundwater pollution, and improve the salinity and desorption rate. Improved, easy-to-use effects

Active Publication Date: 2013-01-30
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

[0006] In order to overcome the above defects, the present invention provides a kind of uranium CO 2 Add O 2 The in-situ leaching mining treatment method avoids the blockage of underground ore-bearing aquifers and groundwater pollution caused by the use of acid and alkali in-situ leaching for uranium mining

Method used

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  • In-situ uranium leaching and mining treatment method by adding O2 into CO2
  • In-situ uranium leaching and mining treatment method by adding O2 into CO2
  • In-situ uranium leaching and mining treatment method by adding O2 into CO2

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Embodiment 1

[0022] The ground hydration composition type of a uranium-bearing aquifer is HCO 3 -Na and HCO 3 ·Cl-Na type is the main type, and the top and bottom of the uranium-bearing layer are mainly mudstone, with relatively stable thickness and good water resistance. Salinity 3.5g / L, water temperature 15℃, pH value 6.8, Eh: 150mv, HCO 3 - :2000mg / L, O 2 <2mg / L, the hydrogeochemical environment is in the state of weak oxidation-reduction transition zone.

[0023] Using the uranium CO of the present invention 2 Add O 2 The in-situ leaching mining treatment method includes the following steps:

[0024] (1) The leaching liquid is natural bicarbonate-type groundwater (HCO 3 - The content is 2000mg / L, the pH value is 6.8), add O to the leaching solution 2 Then, the underground ore-bearing aquifer is injected through the injection pipeline, and the injection pressure of the leaching solution is controlled at 1.6Mp, O 2 The adding pressure is higher than the injection pressure of the leaching solut...

Embodiment 2

[0046] 108m of water inflow in a uranium-bearing aquifer 3 / d, the permeability coefficient is 0.23m / d. The top and bottom of the uranium-bearing layer are mainly mudstone, with relatively stable thickness and good water resistance. HCO 3 -Na and HCO 3 ·Cl-Na type, salinity 5.7g / L, water temperature 16℃, pH value 8.4, Eh: 400mv, HCO 3 - : 2600mg / L, the hydrogeochemical environment is in the state of weak oxidation-reduction transition zone.

[0047] Using the uranium CO of the present invention 2 Add O 2 The in-situ leaching mining treatment method includes the following steps:

[0048] (1) The leaching liquid is natural bicarbonate-type groundwater (HCO 3 - The content is 2600mg / L, the pH value is 6.8), add O to the leaching solution 2 Then, the underground ore-bearing aquifer is injected through the injection pipeline, and the injection pressure of the leaching solution is controlled at 1.5Mp, O 2 The adding pressure is 0.1Mpa higher than the injection pressure of the leaching so...

Embodiment 3

[0074] In a certain uranium mining area, the bicarbonate-type groundwater in-situ leaching uranium mining process of the present invention is adopted. The water inflow from the ore-bearing aquifer in the mining area is 90m 3 / d, the permeability coefficient is 0.12m / d. The top and bottom of the uranium-bearing layer are mainly mudstone, with relatively stable thickness and good water resistance. HCO 3 -Na and HCO 3 ·Cl-Na type mainly, pH value 7, Eh: 300mv, HCO 3 - : 2100mg / L, the hydrogeochemical environment is in the state of weak oxidation-reduction transition zone.

[0075] Using the uranium CO of the present invention 2 Add O 2 The in-situ leaching mining treatment method includes the following steps:

[0076] (1) The leaching liquid is natural bicarbonate-type groundwater (HCO 3 - The content is 2100mg / L, the pH value is 7), add O to the leaching solution 2 Then, the underground ore-bearing aquifer is injected through the injection pipeline, and the injection pressure of th...

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Abstract

The invention provides an in-situ uranium leaching and mining treatment method by adding O2 into CO2. The invention comprises the steps of (1) adding O2 into leaching solution, then injecting an underground mine-water contained layer into a liquid injection pipeline, and preparing the leaching solution by adopting different oxygenation concentrations according to different underground leaching periods; (2) adding 100-300mg / L of CO2 into the leaching solution containing uranium; (3) conducting ion exchange adsorption on the leaching solution containing uranium, adopting macroporous styrene strong-base anion exchange resin, adsorbing to obtain saturated resin adsorption tail solution; and (4) washing saturated resin by adopting an eluting agent, and then analyzing uranyl carbonate ion solution to obtain Na2U2O7 sediment slurry and sediment mother liquor. According to the method, a high-temperature heating device is eliminated, so that the energy consumption and equipment investment are lowered greatly, the alkali consumption is lowered, control parameters are refined, the consumption of alkali is saved, and the production cost is lowered.

Description

Technical field [0001] The invention relates to an in-situ leaching uranium leaching solution treatment process, in particular to a uranium CO 2 Add O 2 In-situ leaching mining treatment method. Background technique [0002] In-situ leaching of uranium is produced by injecting a certain proportion of leaching solution into the ore layer through a liquid injection well drilled from the surface to the ore-bearing layer, and the injected leaching solution contacts the useful components in the ore to produce chemical reactions. Under the action of diffusion and convection, the soluble compounds leave the chemical reaction zone and enter the solution flow that permeates and migrates along the ore bed to form a leachate; the leachate is lifted from the pumping well to the surface through the ore bed, and the extracted leachate is transported to the recovery workshop for ion exchange and other processes. Finally, qualified products are obtained. The in-situ leaching uranium mining meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/28
Inventor 苏学斌刘乃忠杜志明郭忠德沈红伟程宗芳李建华牛玉清王晓东廖文胜谭亚辉成弘姚益轩王云霞马连春杨少武张万亮原渊张永明
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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