A method for recovering rare earths by reusing mother liquor after ammonium bicarbonate is used to precipitate rare earths in the leaching solution of weathering crust elution type rare earth ore

Abstract

The invention belongs to the technical field of wet metallurgy, and provides a method for weathering crust elution-deposited rare earth ore leaching agent ammonium bicarbonate rare earth precipitatingmother liquor reusing and rare earth recovery. The method is provided for solving the problems that the use amount of hydrogen carbonate in existing weathering crust elution-deposited rare earth oreleaching agent is too large, a large amount of leaching solvents of ammonium sulfate or ammonium chloride contain, serious ammonia nitrogen wastewater pollutions and resource waste are caused, and when an existing production process recycles rare earth precipitating mother liquor, sulfuric acid needs to be used for removing residual ammonium bicarbonate. The rare earth ore leaching agent ammoniumbicarbonate rare earth precipitating mother liquor is reused in a circulating manner for recycling rare earth; in the whole rare earth recycling process, the use amount of ammonium bicarbonate is regulated and controlled, the rare earth precipitation recycling rate is ensured, reusing of the mother liquor obtained after rare earth precipitating does not affect the leaching rate of rare earth, efficient recycling of the rare earth resources under the non-acid condition can be achieved, and the important economic and environment benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for reusing the mother liquor to recover the rare earth after ammonium bicarbonate is used to precipitate the rare earth in the leaching solution of weathering crust leaching type rare earth ore. Background technique [0002] The leaching method is used to mine weathered crust leaching type rare earth ores. The mother liquor after precipitation of rare earths usually contains a large amount of leaching agents such as ammonium sulfate or ammonium chloride and ammonium bicarbonate. Direct discharge not only makes the ammonia nitrogen content of the water body too high, but also causes serious damage Ammonia nitrogen wastewater pollution and eutrophication of water quality also cause a large amount of ammonium sulfate and ammonium chloride leaching agents to be wasted, resulting in increased production costs. The existing production process directly adds...

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Problems solved by technology

[0004] However, although there are abundant weathering crust leaching-type rare earth mineral resources in a certain area in southwest my country, due to the regulations of the International Anti-drug Organization, the use of strong acid and alkali is not allowed in this area, so sulfuric acid cannot be supplied

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