A system and method for in-situ leaching and stratified liquid collection of thick weathering crust leaching type rare earth ore

Abstract

The invention relates to an in-situ leaching layered liquid collection system for thick weathering crust leaching type rare earth ore, including 1 / 3 of the thickness of the ore body, 2 / 3 of the thickness and 5-15 cm below the interface between the semi-weathered layer and the bedrock A layer of liquid collecting and diversion holes arranged along the ore body direction, a liquid collecting ditch corresponding to each layer of liquid collecting and diversion holes, and a liquid collecting pool set in the valley; the liquid collecting and diversion holes are all It includes a plurality of liquid collection and diversion holes arranged in parallel and at intervals; the liquid collection channels are all set around the ore body, and are located 20 to 50 cm below the corresponding liquid collection and diversion hole groups; the liquid collection channels are connected to the liquid collection pool through pipes . By arranging three layers of liquid collection diversion hole groups and layered liquid collection, the recovery rate of rare earths is improved. The liquid collection diversion hole group and the corresponding liquid collection ditch form a liquid collection system, and the formed three-layer liquid collection system is independent of each other. It is beneficial to realize the continuous and efficient production of thick weathering crust leaching type rare earth mines.

Description

technical field [0001] The invention relates to the technical field of rare earth extraction and recovery, in particular to an in-situ leaching layered liquid collection system and method for a thick weathering crust leaching type rare earth ore. Background technique [0002] Weathering crust leaching-type rare earth ore is a unique strategic resource in my country. It is widely distributed in Jiangxi, Fujian, Guangdong, Guangxi, Hunan and Yunnan provinces. It has the characteristics of low radioactivity and high content of medium and heavy rare earth elements. It is called a high-tech technical field The "industrial monosodium glutamate", the mining and recovery of weathering crust leaching type rare earth ore has been highly valued by the country. In engineering practice, the in-situ leaching process is widely used to mine rare earth ore bodies. By injecting leaching agent solution, ion Replacement reaction, exchange rare earth cations into the solution, recover leachate, re...

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Problems solved by technology

[0004] High-altitude thick weathering crust leaching type rare earth deposits are humus layer, fully weathered layer and semi-weathering layer from top to bottom, and the bedrock is below the ore body. Due to the complex structure and many joint surfaces, there are some problems in the existing in-situ leaching and liquid collection methods of weathering crust leaching type rare earth ores: it is easy to form a large amount of leachate "loss" and "channeling" during the leaching process, which seriously affects Rare earth recovery rate, increasing the rare earth recovery cycle, more likely to induce landslides and other geological disasters

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