In-situ leaching and leakage interception method for weathered crust rare earth ore

A weathering crust leaching type, in-situ leaching technology, applied in the direction of improving process efficiency, can solve problems such as waste, leakage and pollution of environmental resources, and achieve the advantages of convenient operation, simple interception method, and beneficial to the protection of ecological environment. Effect

Active Publication Date: 2019-01-11
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for in-situ leaching and leakage interception of weathering crust leaching type rare earth ores, aiming at the problems of in-situ leaching and leachate leakage of weathering crust elution type rare earth ores polluting the environment and causing waste of resources. The in-situ leaching system and the addition of multi-stage interception tanks can effectively solve the

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] For a weathering crust leaching type rare earth mine in Jiangxi, the thickness of the weathering crust is about 18 meters. The bottom of the deposit has unweathered bedrock as a false floor, and the false floor is above the groundwater table. It is suitable for in-situ leaching to recover rare earths. The in-situ leaching seepage interception method includes the following steps:

[0023] In the valley at the bottom of the mine, look for the confluence (catchment surface) of leachate leakage, and build a first-level interception pool; the pool surface of the interception pool has a fan-shaped structure and an inclination angle of 60 degrees relative to the horizontal plane, and the bottom needs to be compacted to ensure that it does not collapse. The upper piece of thick plastic film is used as a water-proof material cloth, and it is spread from the bottom to the downstream dam in a funnel shape, so that the seepage leachate can seep into the interception pond; there are ...

Embodiment 2

[0026] For a weathering crust leaching type rare earth mine in Guangdong, the thickness of the weathering crust is about 15 meters, and the bottom of the deposit has unweathered bedrock as a false floor, and the false floor is above the groundwater table, so it is suitable to use in-situ leaching to recover rare earths. Its in-situ leaching seepage interception method includes the following steps:

[0027] In the valley at the bottom of the mine, look for the confluence (catchment surface) of leachate leakage, and build a first-level interception pool; the bottom of the interception pool needs to be tamped to ensure that it does not collapse, and a thick plastic film is spread as a water-proof material cloth. It has been paved to the downstream dam, and the other three sides are in a fan-shaped structure, and the pool surface of the interception pool maintains a natural state of 60 degrees downward inclination relative to the horizontal plane, so that the seepage leachate can s...

Embodiment 3

[0030] The thickness of the weathering crust leaching type rare earth ore deposit in Panwa, China-Myanmar border is about 25 meters. The bottom of the deposit has unweathered bedrock as a false floor, and the false floor is above the groundwater table, so it can be recovered by in-situ leaching. Rare earth, its in-situ leaching seepage interception method includes the following steps:

[0031]In the valley at the bottom of the mine, look for the confluence (catchment surface) of the leachate leakage, and build a first-level interception pool; the bottom of the interception pool needs to be tamped to ensure that it does not collapse, and a thick plastic film is spread as a water-proof material cloth, from the bottom It has been paved until the other three sides of the small dam are in a fan-shaped structure, and the pool surface of the interception pool maintains a natural state of 60 degrees downward inclination relative to the horizontal plane, so that the seepage leachate can...

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Abstract

The invention discloses an in-situ leaching and leakage interception method for weathered crust rare earth ore. The method comprises the following steps that a liquid injection well and a guide hole are formed for rare earth ore, a liquid collecting reservoir is arranged, then water catchment planes of different heights are found at the foot of a mine, a multi-stage interception pool is established in sequence from high to low, and according to the effusion rare earth content conditions collected by the multi-stage interception pool, collected effusion is used as a rare earth leaching solutionor recovered and applied to preparing a leaching solution. The concept of further introducing the multi-stage interception pool on the basis of a leaching solution recovery system for a weathered crust rare earth ore in-situ leaching process is first proposed, leakage of the leaching solution containing a rare earth and ammonium salt leaching agent is effectively prevented or reduced, ammonia-nitrogen wastewater pollution to underground water and surface water is effectively reduced, the rare earth recovery rate is remarkably increased, consumption of the leaching agent is reduced, and remarkable environmental and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to an in-situ leaching, seepage and closure method for weathering crust leaching type rare earth ores. Background technique [0002] my country is the first country to industrially utilize weathering crust elution-type rare earth ores. At present, the development of weathering crust elution-type rare earth ores mainly adopts in-situ leaching technology. This process does not require mining, does not damage the shape and appearance of the mine, and does not destroy Vegetation will not cause soil erosion, and the vegetation and ecology on the surface of the mine will recover quickly, so it is considered to be a green recovery process for weathering crust leaching type rare earth mines. The in-situ leaching process injects the leaching solution from the injection well on the surface of the mountain, diffuses and infiltrates through the interior of the ore body, makes...

Claims

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Application Information

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IPC IPC(8): C22B3/14C22B59/00
CPCC22B3/14C22B59/00Y02P10/20
Inventor 池汝安刘雪梅吴晓燕张臻悦周芳
Owner WUHAN INSTITUTE OF TECHNOLOGY
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