Process for preparing 5N erbium by extracting and separating

Abstract

The invention discloses a process for preparing 5N erbium by extracting and separating. Erbium chloride of 2N to 3N grades is taken as feed liquid, naphthenic acid is taken as an extracting agent for separating yttrium, and an acidic phosphine reagent P229 is taken as an extracting agent for separating erbium, thulium and ytterbium. The process comprises twelve steps including four separating steps and eight auxiliary steps, wherein the four separating steps separately comprise a Y/HoErTmYb separating work section, an HoEr/ErTmYb separating work section, an Ho/Er separating work section and an Er/TmYb separating work section; the eight auxiliary steps separately comprise a reverse extraction work section for extracting the naphthenic acid, an acid extraction work section, a rare earth saponification work section of the naphthenic acid, a concentration work section, an acid extraction work section, a P229 rare earth saponification work section, a reverse extraction work section for extracting the P229 and a P229 rare earth saponification work section. Ho/Er separation and Er/TmYb separation are connected in series. According to the process disclosed by the invention, a 5N grade erbium product with relative purity of 99.9990 percent to 99.9996 percent can be obtained, and the yield of the product is as high as 94.88 to 97.34 percent. The process disclosed by the invention has the advantages of high purity and high yield of erbium products, large production scale, low consumption of chemical reagents, simplicity and convenience in operation, low production cost and the like.

Description

technical field [0001] The invention relates to a process for extracting and separating 5N erbium, in particular to using 2N-3N erbium chloride solution as the feed liquid, naphthenic acid as the extractant to separate yttrium, and acidic phosphine reagent P229 as the extractant to separate holmium, thulium and Ytterbium, an extraction and separation process for preparing erbium products with a purity ≥ 99.999%. The invention belongs to the technical field of rare earth separation in solvent extraction. Background technique [0002] Erbium is widely used in high-tech fields such as laser materials, magnetostrictive materials, magnetic bubble materials, optical fiber technology, luminescent materials, and optical glass materials. The purity of erbium products is one of the key factors affecting the performance and function of related erbium materials, so improving the purity of erbium products has important practical significance. Erbium products with a relative purity (tha...

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