Method for arranging high-altitude thick weathering crust leaching type rare earth ore in-situ leaching liquid injection wells

Abstract

The invention relates to the technical field of in-situ leaching exploitation and provides a method for arranging high-altitude thick weathering crust leaching type rare earth ore in-situ leaching liquid injection wells. The method for arranging the high-altitude thick weathering crust leaching type rare earth ore in-situ leaching liquid injection wells comprises the following steps that firstly,grids are arranged on the surface of the ore body, and grid point liquid injection wells are arranged in grid points of the grids; secondly, after the grid point liquid injection wells are arranged, grid central liquid injection wells are arranged in centers of the multiple grid point liquid injection wells gathered together; thirdly, after each grid point liquid injection well and each grid central liquid injection well are arranged, a leaching liquid is injected into each grid point liquid injection well and each grid central liquid injection well; and fourthly, flow guide holes are preparedin the ore body in an outward-extending manner, and a rare earth leached liquid treated by the leaching agent is guided to flow out through the flow guide holes. According to the method for arrangingthe high-altitude thick weathering crust leaching type rare earth ore in-situ leaching liquid injection wells, plum blossom-shaped liquid injection wells and a cyclic liquid injection method are adopted; a joint surface is effectively penetrated through; channeling is avoided or reduced so that more leaching liquid can be in sufficient contact with the ore body; the leaching blind zone is reducedgreatly; the rare earth recycling rate is improved; and the recycling cycle of rare earth ore is shortened.

Description

technical field [0001] The invention relates to the technical field of in-situ leaching mining, in particular to a method for arranging in-situ leaching liquid injection wells of high-altitude thick weathering crust leaching type rare earth mines. Background technique [0002] Weathering crust leaching-type rare earth ore is a unique, valuable, limited and non-renewable strategic resource in my country. It has the characteristics of wide distribution, low radioactivity, and high content of medium and heavy rare earth elements. It is an "industrial monosodium glutamate" in the field of high-tech technology. It has High commercial value and strategic value. Therefore, the mining of weathering crust elution-type rare earth ores is highly valued by the state. [0003] At present, low-altitude (324m above sea level) weathering crust elution type rare earth mining is mainly based on the in-situ leaching process. This process does not need to destroy vegetation and mountains. Rare ...

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Problems solved by technology

[0004] However, in view of the high-altitude (2225m above sea level) weathering crust thickness (the thickest is about 150m), complex internal structure, and many joint surfaces in southern Yunnan, the existing weathering crust leaching type rare earth ore leaching rare earth ore in situ There are some problems in the layout of in-situ leaching liquid injection wells: the thickness of the weathered crust ore body is large, the structure is complex, the joint surface is developed, the leachate cannot fully contact the ore body, and it is easy to form a large number of "blind areas" and "channel flow ", which seriously affects the rare earth leaching rate in the in-situ leaching process, increases the rare earth recovery cycle, and easily induces landslide geological disasters

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