Extraction method for group separating three types of rare earth raw materials

Abstract

The invention discloses a fractional extraction method for separating mixed rear earth utilizing three feeding ports. P507 is adopted as a rear earth extraction agent, primary amine N1923 is adopted as an extraction acid agent, and TBP is adopted as an organic phase modifier agent; the three feeding ports are formed in a fractional extraction system, three types of rare earth chloride liquid such as light rare earth ore, middle yttrium europium rich ore, and high yttrium ore are subjected to -Gd/Tb- group separating simultaneously, and two types of rear earth products such as light middle rear earth and heavy rear earth are obtained; the light rear earth ore liquid enters the fractional extraction system from the first feeding port, the middle yttrium europium rich ore liquid enters the fractional extraction system from the second feeding port, and the high yttrium ore liquid enters the fractional extraction system from the third feeding port; and light middle rear earth products with purity of 5N class are obtained from water phase of a first stage extraction trough exit of the fractional extraction system, and heavy rear earth products with 5N class are obtained from waste extraction water phase of an extraction section. According to the extraction method for group separating three types of rare earth raw materials, and compared with a traditional fractional extraction art, consumption of washing acid is reduced by 75%-83%, consumption of organic phase saponification alkali is reduced by 49%-67%, and the number of the whole stages of the extraction troughs is reduced by 30-60%.

Description

technical field [0001] The invention belongs to the field of rare earth extraction and separation, and relates to an extraction method for grouping and separating three rare earth raw materials. Background technique [0002] Rare earth elements have unique and excellent physical and chemical properties such as light, electricity, magnetism, and heat. They have important uses in many fields such as industry, agriculture, and military affairs, and are indispensable strategic resources for modern high-tech. [0003] There are more than 200 kinds of rare earth minerals. Although rare earth ores contain the same rare earth elements, the contents of rare earth elements vary widely. For example, the content of light rare earth elements (La~Nd) in bastnaesite is about 97%, the content of medium rare earth elements (Sm~Gd) is about 2%, and the content of medium and heavy rare earth elements (Tb~Lu and Y) is about 1%. The light rare earth elements in monazite rare earth ore account...

AI Technical Summary

Problems solved by technology

Therefore, the existing extraction and separation methods for light rare earth ore, medium yttrium and europium-rich rare earth ore and high yttrium rare earth ore still have disadvantages such as low separation efficiency, high acid and alkali consumption, low purity of some products, high separation cost, and unreasonable process flow.

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