Two-feeding-opening fully-loaded rare earth fractional extraction separation process method

Abstract

The invention discloses a two-feeding-opening fully-loaded rare earth fractional extraction separation process method. According to the method, P507 serves as a rare earth extracting agent; in a two-feeding-opening fractional extraction separation process, an acid extraction section which takes N235 as an acid extracting agent and takes trioctyl phosphate as an N235 organic phase demulsifying agent is arranged, and the side effect of hydrogen ions can be eliminated through the acid extracting effect of the N235, so that not only is the rare earth separation coefficient not reduced, but also the extracting amount of rare earth in a two-feeding-opening fractional extraction system is not lower than the saponification amount of the rare earth. Compared with the existing two-feeding-opening fractional extraction process, the consumption of acid and alkali in a rare earth separation process can be greatly reduced, wherein the consumption amount of an alkaline reagent is reduced by 39 to 51 percent, and the consumption amount of hydrochloric acid can be reduced by 17 to 26 percent; the waste water discharging amount in the rare earth extraction separation process is greatly reduced; the green degree of rare earth separation is greatly improved; the stage number of extracting tanks can be reduced by 32 to 38 percent; the total investment of the rare earth extraction separation process is reduced. Therefore, the separation cost is remarkably reduced.

Description

technical field [0001] The invention relates to a process method for separating rare earths through full-load fractionation extraction at two feed ports, in particular to using 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (usually abbreviated as P507) as rare earth extractant and tertiary amine N235 as hydrochloric acid extraction A fractional distillation extraction system is used to process two kinds of chlorinated mixed rare earth feed liquids, and the rare earth extraction amount of the fractional distillation extraction system is not lower than the saponification amount of the rare earth. The invention belongs to the field of solvent extraction in hydrometallurgy. Background technique [0002] Because rare earth elements have unique physical and chemical properties, they have become the cradle of modern new materials; however, rare earth elements are a group of symbiotic and difficult to separate elements, so the separation of rare earth elements has always been ...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a kind of process method of separating rare earths by fractional distillation extraction with full load of two feed ports for the side effects of hydrogen ion washing in the existing two-feed inlet rare earth fractionation extraction, so as to eliminate the side effects of hydrogen ion washing and reduce the rare earth Separation of acid and alkali consumption, improve the efficiency of fractionation and extraction stage at the second feed port, and reduce the cost of rare earth separation

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