Method for eluting residual ammonium salt in closed mine field of weathering crust elution-deposited rare earth ore

Abstract

The invention provides a method for eluting residual ammonium salt in a closed mine field of weathering crust elution-deposited rare earth ore, and relates to the field of mining area pollution control and soil remediation. The method comprises the following steps that (1), a metal salt solution is injected into the closed field of the weathering crust elution-deposited rare earth ore for elutionand removal so as to obtain a residual ammonium salt-containing eluate, wherein the mass ratio of the metal salt solution to the rare earth ore is (1-3):1; and 2), and the residual ammonium salt-containing eluate is collected into a liquid collecting tank through a flow guide hole for ammonia nitrogen centralized treatment. According to the method, in the first step, the metal salt solution is injected into an original liquid injection pipe in the closed mine field subjected to heap eluting or in-situ eluting to serve as an eluting agent, then eluting liquid is collected through the flow guidehole to be subjected to ammonia nitrogen centralized treatment; and compared with the process that the residual ammonium salt in the closed mine field is directly eluted and removed through clear water, the method is high in efficiency and low in cost, and a large amount of residual ammonium salt ore eluting agent in the closed field of the weathering crust elution-deposited rare earth ore can beefficiently eluted and removed.

Description

technical field [0001] The invention relates to the fields of pollution control and soil restoration in mining areas, in particular to a leaching method for residual ammonium salts in closed mine closures of weathering crust leaching type rare earth mines. 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 have great economic and strategic value. The mining of this mine has been highly valued 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 origin...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a method for rinsing residual ammonium salts in a weathering crust elution type rare earth mine closure, which can efficiently remove a large amount of residual ammonium salts in a heap leaching or in-situ leaching closure. Advanced ammonium salt leaching agent, which greatly reduces the residual ammonium salt in the closed mine, and effectively solves the problem of regional ammonia nitrogen pollution caused by heap leaching or in-situ leaching of weathering crust leaching rare earth ores

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