Process for producing high-purity gadolinium chloride through fuzzy linkage extraction separation

Abstract

The invention discloses a process for producing high-purity gadolinium chloride through fuzzy linkage extraction separation. The process consists of three production lines, namely a Sm / Gd separation line, a Sm / Eu separation line and a Eu / Gd separation line. The process comprises the following steps: pretreating a (SmEuGd)Cl3 feed liquid through the Sm / Gd separation line, and separating Sm from Gd; allowing the (SmEu)Cl3 feed liquid at an extraction outlet of the Sm / Gd separation line to enter the Sm / Eu separation line, allowing (EuGd)A3 feed liquid at an organic outlet of the Sm / Gd separation line to enter the Eu / Gd separation line, connecting the Sm / Eu separation line and the Eu / Gd separation line in series to respectively obtain a SmCl3 product, a feed liquid product of which the Eu percent is more than 50 percent and a GdCl3 product with the purity of 99.99 percent. The process is low in investment and low in acid-base operating consumption, the acid-base consumption can be reduced by over 15 percent, the rare earth rolling groove amount is reduced by over 15 percent, the product quality stability is improved, and the field staff operation is simple.

Description

technical field [0001] The invention relates to a process method for producing a high-purity gadolinium chloride product through fuzzy linkage extraction and separation. Background technique [0002] During the extraction and separation process, the raw ore rare earth chloride feed liquid passes through the front grouping process production line to obtain the SmEuGd mixed rare earth chloride feed liquid that meets the required purity. To produce 99.99% high-purity gadolinium chloride product, it must be re-separated. The traditional separation process is a three-outlet process with aqueous phase feed. Two process characteristics: one is high acid and alkali consumption, which requires a large amount of extraction and washing to produce a Eu% partition enrichment greater than 50% and 99.99% high Purity gadolinium chloride product; second, the amount of rare earth pressing tank is large. Due to the need for a large amount of extraction and washing, the sum of the organic phase...

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Problems solved by technology

The traditional separation process is a three-outlet process with aqueous phase feed. Two process characteristics: one is high acid and alkali consumption, which requires a large amount of extraction and washing to produce a Eu% partition enrichment greater than 50% and 99.99% high Purity gadolinium chloride product; second, the amount of rare earth pressing tank is large. Due to the need for a large amount of extraction and washing, the sum of the organic phase and the water phase is relatively large. In order to meet the requirements of the mixing time process, the extraction equipment must be enlarged. Increased the inherent groove volume of rare earth

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