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A method for recovering rare earth by secondary in-situ leaching of weathering crust elution type rare earth ore

A weathering crust leaching type, in-situ leaching technology, applied in the direction of improving process efficiency, can solve the problems of affecting rare earth recovery efficiency, difficult to eliminate, affecting the lateral diffusion of leaching agent liquid, etc., to improve rare earth recovery rate, economical The effect of significant benefit and low investment

Active Publication Date: 2020-05-22
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that there are usually cracks or joints in the ore body of weathering crust leaching type rare earth ore, during the in-situ leaching process, the leachant solution injected into the ore body will continue to diffuse and infiltrate in the ore body under the action of concentration gradient and gravity. When encountering joint grooves or fissures, it often flows along these grooves or fissures, so that the leaching agent cannot diffuse to the other end of the fissure or joint groove, which affects the lateral diffusion of the leaching agent, causing the leaching agent to fail. Full contact with all the mines leads to leaching blind areas in the leaching process; once the cracks expand to form a ditch, although the leaching agent solution is continuously injected from the injection well, the leaching liquid can only flow down the ditch. Once the leaching blind area The formation is difficult to eliminate and affects the recovery efficiency of rare earths

Method used

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  • A method for recovering rare earth by secondary in-situ leaching of weathering crust elution type rare earth ore
  • A method for recovering rare earth by secondary in-situ leaching of weathering crust elution type rare earth ore
  • A method for recovering rare earth by secondary in-situ leaching of weathering crust elution type rare earth ore

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Embodiment 1

[0023] For a weathering crust leaching-type rare earth mine in Jiangxi, the average grade of raw ore rare earth is 0.11%, and the estimated amount of weathering crust rare earth ore is 2.2 million tons. The in-situ leaching method for rare earth recovery includes the following steps:

[0024] 1) Carry out an in-situ leaching of the rare earth ore. When the concentration of the rare earth in the in-situ leaching solution collected is only 0.1g / L, stop the liquid injection, finish the leaching process, and close the mine; finally, only about 1,700 tons, the recovery rate is 70%; in addition to the loss of running, leaking and impurity removal, a considerable part of rare earth should still remain in the ore body;

[0025] 2) After two years of mine closure, dredge the liquid injection well for in-situ leaching for the first time, and add a new liquid injection well (0.1m in diameter) in parallel in the middle of each adjacent four liquid injection wells; For the diversion holes ...

Embodiment 2

[0033] For a weathering crust elution-type rare earth mine in Jiangxi, the average grade of rare earth in the original ore is 0.09%, and the estimated amount of weathering crust rare earth ore is 2.9 million tons. The in-situ leaching method for rare earth recovery includes the following steps:

[0034] 1) Carry out an in-situ leaching of the rare earth ore. When the rare earth concentration in the collected in-situ leaching solution is only 0.1g / L, stop the liquid injection, finish the leaching process, and close the mine. Finally, only about 1,810 tons, with a recovery rate of 69.3%; after deducting the essential loss of leakage and impurity removal, there should still be a considerable part of rare earths still in the ore body;

[0035] 2) After two and a half years of mine closure, dredge the liquid injection well for the first in-situ leaching, and add a new liquid injection well (0.1m in diameter) in the middle of every four adjacent liquid injection wells; For the diver...

Embodiment 3

[0042] For a weathering crust leaching-type rare earth ore in Banwa, the average grade of raw ore rare earth is 0.08%, and the amount of weathering crust rare earth ore is estimated to be 1.8 million tons. The in-situ leaching method for rare earth recovery includes the following steps:

[0043] 1) Carry out an in-situ leaching of the rare earth ore. When the concentration of the rare earth in the in-situ leaching solution collected is only 0.1g / L, stop the liquid injection, finish the leaching process, and close the mine; finally, only about 990 tons, with a recovery rate of 68.8%; after deducting the essential loss of escape, leakage and impurity removal, there should still be a considerable part of rare earths still in the ore body;

[0044] 2) After two years of mine closure, dredge the liquid injection wells left by the first in-situ leaching, and add a new liquid injection well (0.1m in diameter) in the middle of every four adjacent liquid injection wells; dredge the firs...

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Abstract

The invention belongs to the field of hydrometallurgy and discloses a method for recycling rare earth through secondary in-situ leaching of weathering crust eluvial type rare earth ore. The method comprises the following steps: mine closure treatment is carried out on the weathering crust eluvial type rare earth ore after primary in-situ leaching for a period of time, then, the original liquid injection wells and flow diversion hole are dredged, new liquid injection wells are formed among the four adjacent liquid injection wells, a leaching agent is filled in the new liquid injection wells tocarry out secondary in-situ leaching on the ore body, the obtained secondary lixivium flows into a liquid collecting tank through the flow diversion hole, and finally, rare earth is recycled through sedimentation. With adoption of the method, residual rare earth of the ore body and the rare earth leached in a dead zone can be effectively recycled to remarkably increase the rare earth recovery rateof the ore after in-situ leaching; and in addition, leaching facility of primary in-situ leaching can be fully utilized, and the method has remarkable economic benefit and environmental benefit.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for secondary in-situ leaching and recovery of rare earths from weathering crust leaching type rare earth ores. Background technique [0002] Weathering crust leaching type rare earth minerals are rich in weatherable rare earth minerals. Through physical, chemical and biological actions, the original rock is weathered to form clay minerals. During the weathering process, the rare earth minerals dissociate into rare earth ions, which are adsorbed on the clay by hydration or hydroxyl hydration ions. Mineral formation, ammonium sulfate, ammonium chloride, mixed ammonium salt or magnesium sulfate are used as leaching agents in production, and rare earths are exchanged in the solution by using the principle of ion exchange. After collecting rare earth leachate, use a small amount of sodium sulfide Ammonium bicarbonate is used to adjust the pH value to precipitate an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B3/14C22B59/00C22B3/44
CPCC22B3/04C22B3/44C22B59/00Y02P10/20
Inventor 池汝安张臻悦吴晓燕刘雪梅周芳
Owner WUHAN INSTITUTE OF TECHNOLOGY