Leaching method of weathered crust illuviation type ion rare earth ore

Abstract

The invention provides a leaching method of weathered crust illuviation type ion rare earth ore and relates to improvement of a wet metallurgical rare earth leaching process. The leaching process of the leaching method comprises adding a leaching agent for leaching. The leaching method is characterized in that fulvic acid is further added in the leaching process of the leaching method as a leaching aid. The leaching method of weathered crust illuviation type ion rare earth ore provided by the invention obviously prompts the column leaching effect of rare earth while reducing the dosage of ammonium sulfate, reduces the dosage of the leaching agent ammonium sulfate while improving the rare earth leaching rate, and also effectively reduces the rare earth extraction cost and generation of ammonia-nitrogen wastewater.

Description

Technical field [0001] A method for leaching a weathered crust leaching ion rare earth ore relates to an improvement of a hydrometallurgical process for leaching rare earths. Background technique [0002] The chemical composition of weathering crust leaching type rare earth ore is based on SiO 2 Mainly, quartz, plagioclase, potash feldspar, kaolinite and muscovite are the main ore minerals that make up the weathering crust leaching type rare earth ore. The rare earths are mainly adsorbed on kaolinite, halloysite and illite in the form of ions. In clay minerals, when rare earth ions encounter more active electrolyte cations (Na + , K + , NH 4 + , H + Etc.) can be exchanged and resolved from clay minerals. [0003] The extraction of weathered crust leaching rare earth ore successively uses sodium chloride and ammonium sulfate as the leaching agent. The leaching selectivity of ammonium sulfate is significantly better than sodium chloride, which is beneficial to the extraction of rare ...

AI Technical Summary

Problems solved by technology

However, the leaching rate of rare earths with ammonium sulfate is low, and the consumption of leaching agents is large, which not only causes waste of resources, but also produces a large amount of ammonia nitrogen wastewater. Therefore, the research and development of high-efficiency leaching agents can not only increase the leaching rate of rare earths, but also reduce the generation of ammonia nitrogen wastewater , to achieve an economical and environmentally friendly rare earth extraction process

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