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Method for reducing underground water pollution of in-situ uranium leaching ore-bearing and water-bearing stratum

A technology for groundwater pollution and in-situ leaching of uranium, which is applied in the treatment of contaminated groundwater/leachate, water/sewage treatment, chemical instruments and methods, etc. It can solve the problems of secondary pollution, waste of resources, and long treatment period , to reduce the processing cost and achieve the effect of comprehensive recovery

Inactive Publication Date: 2017-11-03
中核通辽铀业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The removal method is to extract the groundwater from the ore-bearing aquifer, carry out natural evaporation treatment on the surface, and replenish the peripheral groundwater. The groundwater in the aquifer is pumped out, surface reverse osmosis treatment is carried out, fresh water is reused, and the concentrated water is discharged to the evaporation pond. The disadvantage is that the useful uranium metal is not recovered, resulting in resource waste and environmental pollution; the other two methods have different disadvantages, including high cost. , long treatment cycle and secondary pollution

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  • Method for reducing underground water pollution of in-situ uranium leaching ore-bearing and water-bearing stratum

Examples

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Embodiment 1

[0026] Taking a uranium mine as an example, such as figure 1 Shown, adopt a kind of method of the present invention to reduce the groundwater pollution of uranium mining ore-bearing aquifer by in-situ leaching, it comprises the steps:

[0027] (a) When the uranium mine field mining area is shut down or decommissioned, and the average uranium concentration of the leachate in the mining area is less than or equal to 3mg / L, the groundwater in the ore-bearing aquifer is treated from step (b) to step (e).

[0028] (b) Raising groundwater from mineral-bearing aquifers to surface sumps through pumping wells.

[0029] (c) Mineral-bearing aquifer groundwater in the sump enters the reverse osmosis unit.

[0030] (d) Concentrated water produced by the reverse osmosis device, when the concentration of uranium is greater than or equal to 6mg / L, the concentrated water is discharged to the stock solution pool, as the stock solution for reuse, it enters the water metallurgy workshop to extra...

Embodiment 2

[0035] Taking a uranium mine as an example, such as figure 1 Shown, adopt a kind of method of the present invention to reduce the groundwater pollution of uranium mining ore-bearing aquifer by in-situ leaching, it comprises the steps:

[0036] (a) When the mining area of ​​the uranium mine is shut down or decommissioned, and the leaching rate of the mining area is greater than or equal to 75%, the groundwater in the ore-bearing aquifer is treated from step (b) to step (e).

[0037] (b) Raising groundwater from mineral-bearing aquifers to surface sumps through pumping wells.

[0038] (c) Mineral-bearing aquifer groundwater in the sump enters the reverse osmosis unit.

[0039] (d) Concentrated water produced by the reverse osmosis device, when the concentration of uranium is greater than or equal to 6mg / L, the concentrated water is discharged to the stock solution pool, as the stock solution for reuse, it enters the water metallurgy workshop to extract uranium, and the waste li...

Embodiment 3

[0044] Taking a uranium mine as an example, such as figure 1 Shown, adopt a kind of method of the present invention to reduce the groundwater pollution of uranium mining ore-bearing aquifer by in-situ leaching, it comprises the steps:

[0045] (a) When the uranium mine field mining area is shut down or decommissioned, and the average uranium concentration of the leachate in the mining area is less than or equal to 3mg / L, the groundwater in the ore-bearing aquifer is treated from step (b) to step (e).

[0046] (b) Raising groundwater from mineral-bearing aquifers to surface sumps through pumping wells.

[0047] (c) Mineral-bearing aquifer groundwater in the sump enters the reverse osmosis unit.

[0048](d) Concentrated water produced by the reverse osmosis device, when the concentration of uranium is greater than or equal to 6mg / L, the concentrated water is discharged to the stock solution pool, as the stock solution for reuse, it enters the water metallurgy workshop to extrac...

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Abstract

The invention provides a method for reducing underground water pollution of an in-situ uranium leaching ore-bearing and water-bearing stratum. Ore-bearing and water-bearing stratum underground water is lifted to a ground surface water-gathering pond through a liquid pumping well; the ore-bearing and water-bearing stratum underground water in the water-gathering pond enters a reverse osmosis device; when the uranium concertation of concentrated water produced by the reverse osmosis device is greater than or equal to 6 mg / L, the concentrated water is discharged into a stock solution pond to serve as a reused stock solution and enters a water treatment workshop to extract uranium, the waste solution after uranium extraction enters a solution preparation pond and then returns to the ore-bearing and water-bearing stratum through an injection well. When the uranium concertation is smaller than 6 mg / L, the concentrated water is discharged into an evaporation pond to serve as abandoned water. Fresh water produced by the reverse osmosis device enters the solution preparation pond and returns back to the ore-bearing and water-bearing stratum again through the injection well. The caused problem of the underground water pollution of the ore-bearing and water-bearing stratum in the in-situ uranium leaching process can be solved, comprehensive ore recovery is achieved, wastewater treatment cost is reduced, and the purposes of improving the quality and improving the effect are achieved.

Description

technical field [0001] The invention belongs to a groundwater restoration process for in-situ leaching uranium mining, relates to a method for restoring and controlling groundwater in an ore-bearing aquifer in the field of in-situ leaching uranium mining, and specifically relates to a method for reducing groundwater pollution in an ore-bearing aquifer for in-situ leaching uranium mining. Background technique [0002] Compared with conventional mining technology, in-situ leaching uranium mining technology has many advantages, including less investment in infrastructure, short construction period, and less damage to the environment. However, long-term injection of chemical reagents will pollute groundwater, and chemical reagents will also interact with gangue Minerals undergo chemical reactions that lead to changes in the water quality of ore-bearing aquifers, even with CO 2 and O 2 In-situ leaching for uranium mining also pollutes groundwater. [0003] The groundwater pollu...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F9/10C22B60/02C02F103/06
CPCC02F1/04C02F1/441C02F2103/06C22B60/0221Y02P10/20
Inventor 苏学斌张勇汤庆四李喜龙高险峰曹俊鹏
Owner 中核通辽铀业有限责任公司
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