Technological method of full load fractional extracting and separating rare earths

Abstract

The invention relates to a technological method of full load fractional extracting and separating rare earths. According to the technological method disclosed by the invention, P507 or P204 serves as a rare earth extractant; in a fractional extraction separation technology, N235 serves as an acid extraction agent, and a mixed alcohol serves as an acid extraction segment of an N235 organic phase regulator; an easily-extracted rare earth component solution with a pH value to be 1-4 serves as a washing solution; by virtue of the acid extraction action of the N235 in the acid extraction segment, the side effects of hydrogen ion washing are eliminated, so that the separation factor of the rare earths is ensured not to be lowered, and the extraction quantity of the extractant in a fractional extraction system is also ensured. Compared with the traditional fractional extraction separation technology, the acid and alkali consumption in the process of the rare earth separation technology can be greatly lowered, wherein the consumption of a basic reagent is lowered by 34-62 percent, and the consumption of hydrochloride is lowered by 16-29 percent; the waste water discharge in the process of the rare earth extraction separation technology is greatly reduced, the greening degree of rare earth separation is greatly increased; the grade amount of extraction tank is reduced by 22-46 percent, the total investment of the rare earth extraction separation technology is lowered; the separation cost is greatly lowered.

Description

technical field

[0001] The invention relates to a process method for extracting and separating rare earths by fractional distillation with full load, in particular to a method using chlorinated mixed rare earth material liquid as a raw material, P507 or P204 as a rare earth extraction agent, tertiary amine N235 as an acid extraction agent, and the extraction amount of rare earths is not less than that of rare earths Saponification fractional extraction and separation of rare earth technology. The invention belongs to the field of solvent extraction in hydrometallurgy. Background technique

[0002] Rare earth elements are extremely important high-tech strategic materials, so the separation of rare earth elements has attracted much attention. At present, the industrial separation of rare earth elements adopts the fractional distillation extraction method. Usually, 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (trade name P507) or bis(2-ethylhexyl) phosphoric acid (trad...

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