Method for extracting and separating light rare earth

Abstract

The invention discloses a method for extracting and separating light rare earth and aims at providing an extracting and separating technology with low separation cost and less one-time investment for the light rare earth. The key points of the technical scheme provided by the invention are as follows: light rare earth materials containing La, Ce, Pr and Nd elements are separated into single elements of the La, the Ce, the Pr and the Nd; and due to the utilization of a fuzzy separation technology, a separation module combined linkage technology, a displacement extraction technology, an extraction amount and washing mount multiplexing technology, an organic feeding technology, a three-outlet technology, a washing and acid regurgitation operating technology, a rare earth washing technology, a diversion technology, an organic phase extraction tank continuous saponification technology and an extraction tank continuous rare earth saponification technology for optimization, more materials filled in the tank for extracting and separating the light rare earth are saved, the production cost is lower and less waste water is produced. The method disclosed by the invention is used for extracting and separating light rare earth elements and belongs to a rare earth separation technology.

Description

technical field [0001] The invention relates to a separation technology of rare earth elements, more specifically, it relates to a method for extraction and separation of light rare earth elements. Background technique [0002] Light rare earth has a large content, a wide range of applications, and a large amount. It is an important part of rare earth elements. Ionic rare earth ores in southern my country (except high yttrium ore) are generally dominated by light rare earths (La, Ce, Pr, Nd), accounting for about 60%. Mixed rare earth concentrates in northern my country and bastnaesite in Sichuan are also Light rare earths dominate, accounting for 96% to 98%. This characteristic of the North and South rare earth mines determines that the key to the separation of rare earths lies in the separation of light rare earths. The separation cost of light rare earths accounts for 30% to 60% of the entire separation cost. The light rare earth components of mixed rare earth concentrate...

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Problems solved by technology

[0003] The present invention solves the problem of excessive consumption of tank filling material and acid-base consumption in the extraction and separation of light rare earth, and provides an advanced and reasonable process technology with less material for tank filling and lower production cost during extraction and separation of light rare earth, so that the production line can achieve continuous , stable, low-consumption assembly line operation requirements

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