Composite leaching agent for enhanced leaching of weathered crust elution-deposited rare earth ores

Abstract

The invention relates to the field of wet metallurgy, in particular to a composite leaching agent for enhanced leaching of weathered crust elution-deposited rare earth ores and a preparation method thereof and a method for extracting rare earth. The composite leaching agent for enhanced leaching of the weathered crust elution-deposited rare earth ores comprises 1-4 % of an inorganic leaching agentand 0.1-1.2% of one or a combination of more of dimethyl diallyl ammonium chloride, 2-chloroethyl trimetyl ammonium chloride, an acrylamide and dimethyl diallyl ammonium chloride copolymer and acrylamidetrimethyl allyl ammonium chloride according to the mass percentage. The method for extracting the rare earth comprises the step of using the composite leaching agent for enhanced leaching of the weathered crust elution-deposited rare earth ores to leach the rare earth in the rare earth ores. Under the coordination between the inorganic leaching agent and an organic stabilizer, the weathered crust elution-deposited rare earth ores are leached in situ, the permeation of the leaching agent and the leaching process of the rare earth are enhanced, the consumption of the leaching agent is reduced, the expansion of the clay minerals is inhibited, problems that stability of the weathered crust elution-deposited rare earth ores is low and the weathered crust elution-deposited rare earth ores are easy to generate landslide due to the inorganic leaching agent are solved, and the exploration period is also shortened.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a composite leaching agent for preventing landslides, improving seepage and strengthening the rare earth leaching process during in-situ leaching of weathering crust elution type rare earth ores. Background technique [0002] The reserves of medium and heavy rare earths contained in weathering crust elution-type rare earth ores account for more than 80% of the world, making up for the lack of low heavy rare earth content in mineral-type rare earth ores. They have received great attention from downstream industries that use medium and heavy rare earths, and are extremely valuable Mineral resources, its development and utilization play a pivotal role in the world rare earth industry. [0003] At present, rare earths in weathering crust leaching type rare earth ores are mainly adsorbed on clay minerals by hydration or hydroxyl hydration ions, and can only be extracted by ion exchange....

AI Technical Summary

Problems solved by technology

However, the leaching agent injected into the ore body will cause the expansion of the clay minerals. When the clay minerals are finer, the penetration rate of the leaching agent will be slower, and the mining cycle of rare earth mines will be prolonged, which will affect the recovery efficiency of rare earths and affect the recovery of rare earths. Economic Benefits of Manufacturing Enterprises

What is more serious is that the in-situ leaching process is often accompanied by geological disasters such as landslides, which affect the ecological environment, mine safety and the economic benefits of mining enterprises.

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