Gradient leaching technology of weathering crust elution-deposited rare earth ore residual ore leaching agent

A weathering crust elution type and gradient leaching technology, which is applied in the field of mining pollution control and soil remediation, can solve regional ammonia nitrogen pollution and other problems, achieve environmental friendliness, important economic and environmental benefits, and reduce the use amount

Active Publication Date: 2020-08-04
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 gradient leaching technology for the residual leaching agent of the weathering crust elution type rare earth ore in view of the deficiencies in the prior art. The leaching technology can effectively remove the weathering crust leaching type rare earth Ammonium salt leaching agent remains in the mine closure, and the amount of leac

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] A kind of gradient leaching technology for the leaching agent of a weathered crust leaching type rare earth ore residue. The in-situ leaching closed mine sample of a weathering crust leaching type rare earth mine in Longnan County, Ganzhou City, Jiangxi Province was selected as an experimental study. The residual ammonium content in the ore sample is 1.86 mg / g (calculated as N). The column leaching simulation process is used to rinse the residual ammonium salt leaching agent, which specifically includes the following steps:

[0032] 1) Under the simulated actual process conditions of column leaching weathered crust leaching type rare earth ore tailings, water is injected into the residual mineral sample at a flow rate of 0.4 mL / min for elution and elution. The mass ratio is 1:1;

[0033] 2) After step 1) is completed, inject a mixed solution (low concentration elution) of magnesium chloride (0.02mol / L) and malic acid (0.005mol / L) into the residual mineral s...

Example Embodiment

[0037] Example 2

[0038] A kind of gradient leaching technology for the leaching agent of a weathered crust leaching type rare earth ore residue. The in-situ leaching closed mine sample of a weathering crust leaching type rare earth mine in Longnan County, Ganzhou City, Jiangxi Province was selected as an experimental study. The residual ammonium content in the ore sample is 1.86 mg / g (calculated as N). The column leaching simulation process is used to rinse the residual ammonium salt leaching agent, which specifically includes the following steps:

[0039] 1) Under the simulating actual process conditions of column leaching weathered crust leaching type rare earth ore tailings, water is injected into the residual mineral sample (tailings) at a flow rate of 0.6 mL / min for elution and elution. The mass ratio of residual mineral samples is 0.8:1;

[0040] 2) After step 1) is completed, inject a mixed solution (low concentration elution) of magnesium chloride (0.04mol / L) and malic aci...

Example Embodiment

[0044] Example 3

[0045] A kind of gradient leaching technique for the leaching agent of the weathered crust leaching type rare earth ore. The in-situ leaching closed mine sample of a weathering crust leaching rare earth mine in Sanming City, Fujian Province is selected as the experimental study, and the closed mine sample remains The ammonium content is 1.98mg / g (calculated as N). The column leaching simulation process is used to rinse the residual ammonium salt leaching agent, which specifically includes the following steps:

[0046] 1) Under the simulated actual process conditions of column leaching weathered crust leaching type rare earth ore tailings, water was injected into the residual mineral sample at a liquid injection flow rate of 0.8 mL / min for elution. The mass ratio is 0.8:1;

[0047] 2) After step 1) is completed, inject a compound solution (low concentration elution) of magnesium chloride (0.02mol / L) and malic acid (0.005mol / L) into the residual mineral sample at a ...

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Abstract

The invention discloses a gradient leaching technology of a weathering crust elution-deposited rare earth ore residual ore leaching agent and aims at a closed ore field of weathering crust elution-deposited rare earth ore. Water, a low-concentration leaching solution and a high-concentration leaching solution are sequentially injected into the closed ore field of the rare earth ore by utilizing aliquid injection pipe left in the dump leaching or in-situ leaching process for leaching, and the obtained eluent is recycled, so that the problem of regional ammonia nitrogen pollution caused by slowrelease of a residual ammonium salt leaching agent is effectively solved. According to the method, the gradient leaching technology is proposed for the first time, so that the leaching efficiency ofresidual ammonium can be remarkably improved while the usage amount of a metal salt leaching agent is effectively reduced, and the related leaching technology is simple in process, convenient to operate and short in period, has important economic and environmental benefits, and can provide a brand-new thought for efficient and rapid treatment of the residual ammonium salt ore leaching agent in theclosed ore field.

Description

technical field [0001] The invention belongs to the utilization technical field of mining area pollution control and soil restoration, and in particular relates to a process for comprehensively utilizing high-magnesium phosphorus tailings and phosphogypsum. Background technique [0002] Weathering crust leaching-type rare earth ores are widely distributed in seven provinces including Jiangxi, Guangdong, Fujian, Hunan, Yunnan, Guangxi and Zhejiang. Because they are rich in medium and heavy rare earths with high commercial value, they are of great economic and strategic value. High attention at home and abroad. Weathering crust leaching type rare earth ores are composed of rare earth-containing granite and volcanic rocks, which are weathered to form kaolinite, halloysite, montmorillonite and illite through biological, chemical and physical actions in a warm and humid climate. At the same time, the easily weathered rare earth minerals in the original rock are weathered and dis...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 余军霞冯健池汝安黄书鑫周芳徐源来
Owner WUHAN INSTITUTE OF TECHNOLOGY
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