Method for grouping high-yttrium rare earth ore and separating yttrium oxide

Abstract

The invention relates to a method for grouping high-yttrium rare earth ore and separating yttrium oxide, and belongs to the technical field of rare earth extraction separation. The problem of restriction of industrial application by naphthenic acid replacement needed in the long-term process flow of separation of yttrium oxide from an existing naphthenic acid system and HAB mixed system and the problem of difficulty in rapid onsite analysis of the change of the concentrations of two extractants in the HAB system is solved. The system comprises the following steps: grouping erbium and thulium by a P507-isooctyl alcohol mixed system to obtain a high-yttrium concentrate and a thulium-ytterbium-lutetium concentrate, separating the high-yttrium concentrate and the thulium-ytterbium-lutetium concentrate to prepare lutetium oxide and other heavy rare earths, separating the high-yttrium concentrate by a carboxylic acid extractant HA-TBP mixed system to prepare yttrium oxide, and grouping the La to Er concentrate by adopting a P507 system to separate other single rare earth elements. The grouping and separating method has the advantages of advanced and reasonable process, short process flow, low production cost, strong adaptability, and easiness in operation control, has better comprehensive, technological and economic indicators than the naphthenic acid technology, and has practical application values.

Description

technical field [0001] The invention belongs to the technical field of rare earth extraction and separation, and in particular relates to a method for grouping and separating yttrium oxide from high-yttrium type rare earth ores. Background technique [0002] Southern ionic rare earth ores 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. They are unique strategic resources in my country. Ion-type ores are mainly distributed in Jiangxi, Fujian, Guangdong, Hunan and Guangxi provinces in southern my country. According to the distribution characteristics of rare earth ores, 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). type). The content of heavy rare earths in high-yttrium rare earth ores is about 90%, of which the conten...

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.

Images