A method for grouping and separating yttrium oxide from middle yttrium and europium-rich rare earth ores

Abstract

The invention relates to a method for separating yttrium oxide from middle-yttrium europium-rich rare earth ore by grouping, and belongs to the field of rare earth extraction separation. The problem that the industrial application is limited due to the fact that the problems that naphthenic acid needs to be replaced in the long using process of the technological process of separating the yttrium oxide by an existing naphthenic acid system and an HAB mixed system and the difficulty of rapid analysis of the concentration changes of two extraction agents of the HAB system on the site is solved. The method comprises the steps that firstly, dysprosium and holmium grouping is carried out by adopting a P507 mixed system to obtain a yttrium-rich material 1 and light-medium rare earth enrichment, and single rare earth is separated from the light-medium rare earth enrichment by the P507 system; then the yttrium-rich material 1 is subjected to erbium and thulium grouping by adopting P507-isooctylalcohol and other mixed systems, a yttrium-rich material 2 and thulium-ytterbium-lutetium enrichment are obtained, and single heavy rare earth is separated from the thulium-ytterbium-lutetium enrichment; and finally, the yttrium oxide is separated and prepared by the yttrium-rich material 2 by adopting an HA-TBP mixed system. The grouping separating method has the advantages of advancement and reasonability, short technological process, low production cost, high adaptability, easy operation and control, and comprehensive technical and economic index performance is better than a naphthenic acid process, and practical application value is achieved.

Description

Technical field [0001] The invention belongs to the technical field of rare earth extraction and separation, and specifically relates to a method for grouping and separating yttrium oxide from a middle yttrium rich europium type rare earth ore. Background technique [0002] The southern ion-type rare earth mines have a complete distribution, mainly medium and heavy rare earths, rich in europium, terbium, dysprosium, erbium, lutetium, yttrium and other medium and heavy rare earth elements required for functional materials, which are my country's unique strategic resources. Ionic mines are mainly distributed in Jiangxi, Fujian, Guangdong, Hunan and Guangxi provinces in southern my country. According to the distribution characteristics of rare earth mines, they can be divided into light rare earth type, medium yttrium rich europium type and high yttrium type (also known as heavy rare earth type). The distribution characteristics of the middle yttrium-rich europium rare earth ore are...

AI Technical Summary

Problems solved by technology

However, industrial practice shows that there are some problems in this process: because naphthenic acid is a by-product of petroleum processing, it has a complex composition and high water solubility, and the composition changes after long-term use, which affects the stability of the process; , prone to emulsification; affected by raw material composition and temperature, the separation coefficient of lanthanum and yttrium is small, which causes great difficulties in the separation of yttrium and lanthanum

However, during the long-term use of the HAB system, there are problems such as the difficulty of rapid analysis of the concentration changes of the two extractants on site, which limits its industrial application.

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