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Method for recycling waste water from well washing in in situ leaching uranium mining

A technology for wastewater circulation and in-situ leaching of uranium, which is applied in the direction of flushing wellbore, earthwork drilling, wellbore/well components, etc. It can solve the problem that the method cannot meet the needs of production, the uranium cannot be effectively recovered, and the amount of well washing wastewater major issues

Active Publication Date: 2019-01-08
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

[0004] This method solves the problem of well washing wastewater treatment and arbitrary discharge to a certain extent, but with the development of the mining area, the amount of well washing wastewater is large, and the natural evaporation method cannot meet the needs of production, and there are many unsafe factors. Uranium cannot be effectively recovered, and it has adverse effects on environmental protection and land acquisition

Method used

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  • Method for recycling waste water from well washing in in situ leaching uranium mining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 Shown, a kind of method for recycling waste water from uranium mining by in-situ leaching of the present invention, it comprises the following steps:

[0022] (a) Lifting the well-washing wastewater of the pumping and injection wells for uranium mining by in-situ leaching to the surface, and then settling through the settling tank, the bottom flow slurry of the settling tank is discharged into the evaporation pool, and the supernatant 1 of the settling tank enters step (b);

[0023] After being clarified by the settling tank, the silt (sand) content of the clear liquid 1 is less than 5.3%, and the particle size distribution is greater than 50 μm, accounting for 90%.

[0024] (b) The supernatant liquid 1 is sent into the hydrocyclone, and the clear liquid 2 coming out of the hydrocyclone enters step (c); the sand-containing solution coming out of the hydrocyclone is returned to the settling tank, and a closed-circuit circulation process is carried out; ...

Embodiment 2

[0032] Such as figure 1 Shown, a kind of method for recycling waste water from uranium mining by in-situ leaching of the present invention, it comprises the following steps:

[0033] (a) Lifting the well-washing wastewater of the pumping and injection wells for uranium mining by in-situ leaching to the surface, and then settling through the settling tank, the bottom flow slurry of the settling tank is discharged into the evaporation pool, and the supernatant 1 of the settling tank enters step (b);

[0034] After being clarified in the settling tank, the mud (sand) content of the clear liquid 1 is less than 4.2%, and the particle size distribution is greater than 50 μm, accounting for 75%.

[0035] (b) The supernatant liquid 1 is sent into the hydrocyclone, and the clear liquid 2 coming out of the hydrocyclone enters step (c); the sand-containing solution coming out of the hydrocyclone is returned to the settling tank, and a closed-circuit circulation process is carried out;

...

Embodiment 3

[0043] Such as figure 1 Shown, a kind of method for recycling waste water from uranium mining by in-situ leaching of the present invention, it comprises the following steps:

[0044] (a) Lifting the well-washing wastewater of the pumping and injection wells for uranium mining by in-situ leaching to the surface, and then settling through the settling tank, the bottom flow slurry of the settling tank is discharged into the evaporation pool, and the supernatant 1 of the settling tank enters step (b);

[0045] After being clarified by the settling tank, the mud (sand) content of the clear liquid 1 is less than 4.8%, and the particle size distribution is greater than 50 μm, accounting for 85%.

[0046] (b) The supernatant liquid 1 is sent into the hydrocyclone, and the clear liquid 2 coming out of the hydrocyclone enters step (c); the sand-containing solution coming out of the hydrocyclone is returned to the settling tank, and a closed-circuit circulation process is carried out;

...

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Abstract

The invention provides a method for recycling well flushing waste water in in-situ leaching uranium exploration. The method comprises the steps that (a), well flushing waste water of a liquid pumping well and a liquid injection well for in-situ leaching uranium exploration is elevated to the ground surface and then settles through a settling basin, and underflow slurry of the settling basin is drained into an evaporation pond; (b) clean liquid 1 is fed into a hydrocyclone, clean liquid 2 discharged out from the hydrocyclone enters the step (c), and a sand-containing solution discharged out from the hydrocyclone returns to the settling basin for closed cycle treatment; (c) the clean liquid 2 enters a self-cleaning filter, clean liquid 3 is obtained through filtering and enters the step (d), and waste liquid generated by automatic reverse flushing enters the hydrocyclone for closed cycle treatment; (d) the clean liquid 3 enters a bag filter, and clean liquid 4 obtained through filtering enters a buffer pool; and (e) the clean liquid 4 in the buffer pool enters the liquid injection well through high-pressure injection. By means of the method, zero emission of waste water is realized, and the problems that due to outwards drainage of well flushing waste water, an evaporation pond occupies the land, environmental issues are caused and uranium recovery is difficult are solved.

Description

technical field [0001] The invention belongs to a wastewater treatment method for in-situ leaching uranium mining, and relates to a method for recycling well washing wastewater in the field of uranium mining and metallurgy, in particular to a method for recycling well washing wastewater for in-situ leaching uranium mining. Background technique [0002] In-situ leaching uranium mining is a uranium mining method that integrates mining and smelting to dissolve uranium in the ore from natural burial conditions through drilling engineering and chemical reagents without causing the ore to move. Drilling is the core of in-situ leaching uranium mining technology. The drilling project not only exposes the ore layer to obtain geological and hydrogeological data to form technological drilling, but also injects chemical reagents into the ore layer to dissolve the ore, enhance the leachate to obtain uranium metal and form a production well. [0003] In the in-situ leaching uranium minin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/06
CPCE21B21/065
Inventor 苏学斌李喜龙张勇高险峰马连春张渤曹俊鹏王凯
Owner 中核通辽铀业有限责任公司
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