Method for in-situ leaching of rare-earth ores from weathering crust elution-deposited rare earth ore
A weathered crust leaching type and in-situ leaching technology, which is applied in the direction of improving process efficiency, can solve the problems of rare earth concentration tailing in the leachate, product purity not meeting the requirements, and poor permeability of the leachate solution, etc., to improve the rare earth concentration. The effects of improving the leaching rate, shortening the outflow time, and reducing geological disasters of ore body landslides
Inactive Publication Date: 2014-01-15
WUHAN INSTITUTE OF TECHNOLOGY
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The invention discloses a method for in-situ leaching of rare-earth ores from a weathering crust elution-deposited rare earth ore. The method comprises the following steps: holes are drilled in an ore body and drilled from a humus layer, a completely weathering layer to a half weathering layer of the ore body, a guide pipe with an opened upper part and an opened lower part is inserted into the holes and reaches the half weathering layer, and an ore leaching liquid is injected into the guide pipe; a diversion trench is formed in a bedrock to be used for guiding the rare earth leaching liquid into a liquid collecting reservoir; holes are distributed in a net shape along the ridge of the ore body, and the distance between every two holes is 2-3 m; a hopper is mounted at the upper end of the guide pipe, a fixing device is arranged on the guide pipe passing through the humus layer. The method has the advantages that the content of leached rare earth mother liquid impurities is reduced, the subsequent rare earth mother liquid treatment is facilitated, the geological hazards caused by the ore body landslide due to water swelling of clay minerals with high content of the humus layer are reduced, ammonium chloride can be used as a leaching agent, and under the premise of not increasing the impurity removal cost, the rare earth leaching rate is improved, and the selection range of the leaching agent is widened.
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