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

A treatment method and in-situ leaching technology, which is applied in the direction of mining fluids, earthwork drilling, boreholes/well components, etc., can solve problems such as blockage of underground ore-bearing aquifers, groundwater pollution, etc., and improve salinity and desorption rate Enhanced, easy-to-operate effects

Active Publication Date: 2015-04-29
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • 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] Groundwater composition types of a uranium-bearing aquifer based on HCO 3 -Na and HCO 3 ·Cl-Na type is the main type, and the roof and floor of the uranium-bearing layer are mainly mudstone, with a relatively stable thickness and good water-proof performance. Salinity 3.5g / L, water temperature 15°C, pH 6.8, Eh: 150mv, HCO 3 - : 2000mg / L, O 2 <2mg / L, the hydrogeochemical environment is in a weak oxidation-reduction transition zone state.

[0023] Adopt the CO of a kind of uranium described in the present invention 2 Add O 2 The in-situ leaching mining treatment method comprises the steps of:

[0024](1) The leaching solution is natural bicarbonate-type groundwater (HCO in ore deposit groundwater 3 - content is 2000mg / L, pH value is 6.8), add O 2 After that, it is injected into the underground ore-bearing aquifer through the injection pipeline, and the injection pressure of the leaching solution is controlled at 1.6Mp, O 2 The adding pressure of the solution is ...

Embodiment 2

[0046] The water inflow in a uranium ore-bearing aquifer is 108m 3 / d, permeability coefficient 0.23m / d. The roof and floor of the uranium-bearing layer are mainly mudstone, with relatively stable thickness and good water-proof performance. Groundwater composition types in uranium-bearing aquifers in terms of HCO 3 -Na and HCO 3 Mainly Cl-Na type, salinity 5.7g / L, water temperature 16°C, pH 8.4, Eh: 400mv, HCO 3 - : 2600mg / L, the hydrogeochemical environment is in a weak oxidation-reduction transition zone state.

[0047] Adopt the CO of a kind of uranium described in the present invention 2 Add O 2 The in-situ leaching mining treatment method comprises the steps of:

[0048] (1) The leaching solution is natural bicarbonate-type groundwater (HCO in ore deposit groundwater 3 - content is 2600mg / L, pH value is 6.8), add O 2 After that, it is injected into the underground ore-bearing aquifer through the injection pipeline, and the injection pressure of the leaching solu...

Embodiment 3

[0074] The bicarbonate-type groundwater in-situ leaching uranium mining process described in the present invention is adopted in a uranium mining area. The water inflow of the ore-bearing aquifer in this mining area is 90m 3 / d, permeability coefficient 0.12m / d. The roof and floor of the uranium-bearing layer are mainly mudstone, with relatively stable thickness and good water-proof performance. Groundwater composition types in uranium-bearing aquifers in terms of HCO 3 -Na and HCO 3 Mainly Cl-Na type, pH value 7, Eh: 300mv, HCO 3 - : 2100mg / L, the hydrogeochemical environment is in a weak oxidation-reduction transition zone state.

[0075] Adopt the CO of a kind of uranium described in the present invention 2 Add O 2 In-situ leaching mining treatment method, which comprises the following steps:

[0076] (1) The leaching solution is natural bicarbonate-type groundwater (HCO in ore deposit groundwater 3 － content is 2100mg / L, pH value is 7), add O 2 After that, it is...

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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 a process for treating uranium leaching solution by in-situ leaching, in particular to a uranium CO 2 Add O 2 In-situ leaching mining treatment method. Background technique [0002] In-situ leaching uranium is produced by injecting a leaching solution 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 solution reacts chemically 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 solution flow that permeates and migrates along the ore layer to form leachate; the leachate passes through the ore layer and is lifted from the pumping well to the surface, and the extracted leachate is transported to the recovery workshop for ion exchange and other processes. Finally, qualified products are obtained. The in-situ leachin...

Claims

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Application Information

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Patent Type & Authority Patents(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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