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Ion adsorption type rare earth ore in-situ leaching field drip washing and sealing method and application

An ion adsorption type, in-situ leaching technology, applied in the direction of improving process efficiency, can solve problems such as ammonia nitrogen pollution, and achieve the effect of good application prospects

Active Publication Date: 2021-08-17
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to provide a method for rinsing and closing the in-situ leaching field of ion-adsorption rare earth ore to alleviate the technical problems of ammonia nitrogen pollution in the prior art

Method used

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  • Ion adsorption type rare earth ore in-situ leaching field drip washing and sealing method and application
  • Ion adsorption type rare earth ore in-situ leaching field drip washing and sealing method and application

Examples

Experimental program
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Embodiment approach

[0050] There can be many specific sources of rinse water. As an optional embodiment of the present invention, the rinsing water includes rinsing tail water that has been treated up to standard.

[0051] The leaching tail water that has been treated up to the standard can be understood as the effluent after the in-situ leaching tail water is treated by membrane method, biological method, chemical method and other methods and meets the requirements of national or local discharge standard limits.

[0052] The leaching tail water that has been treated up to the standard is used as the rinsing water to perform one-step rinsing on the in-situ leaching field, which can realize the recycling of the leaching tail water.

[0053] As an optional embodiment of the present invention, the concentration of ammonia nitrogen in the rinse tail water that has been treated up to the standard is not greater than 15 mg / L. The typical but non-limiting concentration of ammonia nitrogen in the leachi...

Embodiment 1

[0083] This embodiment provides a method for rinsing and closing an ion-adsorption type rare earth ore in-situ leaching field, including the following steps:

[0084] (a) Provide leaching water: Membrane treatment facilities are used to treat the tail water or leaching tail water of the in-situ leaching field. ) as rinse water;

[0085] The infiltration coefficient of the in-situ leaching field is 0.14, and the concentration of ammonia nitrogen in the leaching water (leaching water formed by natural rainfall) before leaching in the in-situ leaching field is about 1200mg / L. The in-situ leaching field is subjected to one-step leaching at the speed of field injection, and the leaching effluent enters the membrane treatment facility for treatment, and the treated effluent is used for repeated leaching, until the concentration of ammonia nitrogen in the one-step leaching water reaches 140 mg / L, and the one-step leaching wash finished;

[0086] (b) The standard tail water obtained...

Embodiment 2

[0094] This embodiment provides a method for rinsing and closing the in-situ leaching field of ion-adsorption rare earth ore, except that the concentration of ammonia nitrogen in the effluent water reaches 120mg / L in step (a), and the one-step leaching ends and step (b) The concentration of ammonia nitrogen in the effluent water of the second-step leaching reaches 100mg / L, the concentration of ammonia nitrogen in the effluent water of the second-step leaching and the three-step leaching in step (c) reaches 80mg / L, and the three-step rinsing ends, and the remaining steps are the same as in Example 1 same.

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Abstract

The invention provides an ion adsorption type rare earth ore in-situ leaching ore field drip washing and sealing method and application, and relates to the technical field of environmental protection. According to the drip washing and sealing method, the drip washing process is divided into three different stages, first-step drip washing is conducted through drip washing water, then second-step drip washing is conducted through a first mixed solution formed by the drip washing water and a corrosion inhibitor, third-step drip washing is conducted through a second mixed solution formed by the drip washing water and a protective agent, finally liquid injection hole dense hole sealing field sealing is conducted, the residual quantity and the release amount of ammonia nitrogen and the infiltration leaching amount of rainwater can be effectively controlled, and the problems of downstream surface water pollution and the like caused by ammonia nitrogen release of the in-situ leaching field are controlled from the source. The invention further provides application of the drip washing and sealing method for the ion adsorption type rare earth ore in-situ leaching field in the field of pollution treatment of the in-situ leaching field.

Description

technical field [0001] The invention relates to the technical field of in-situ leaching field pollution control, in particular to an ion-adsorption type rare earth ore in-situ leaching field leaching and sealing method and application. Background technique [0002] Ion-adsorbed rare earth ores have the characteristics of low grade, shallow burial, and scattered distribution. The groundwater in the in-situ leaching field has the characteristics of shallow burial, short runoff, and close connection between groundwater and surface water. The ion-adsorption type rare earth ore adopts the in-situ leaching process, and ammonium salt (ammonium sulfate) is used as the leaching agent. Excessive ammonium sulfate is added during the leaching process, resulting in a large amount of ammonium sulfate remaining in the in-situ leaching field. During leaching, pollutants such as acid, ammonia nitrogen, sulfate, and heavy metals are released and enter the groundwater, thereby polluting the wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B3/04C22B59/00
CPCC22B1/00C22B3/04C22B59/00Y02P10/20
Inventor 祝怡斌李青熊万胜鞠丽萍陈斌陈玉福李景芬陈谦刘子齐
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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