Novel method for preferentially extracting and separating praseodymium neodymium rare earth and recovering trace cobalt elements from low-concentration magnetic material waste acid dissolution mother liquor

Abstract

The invention discloses a novel method for preferentially extracting and separating praseodymium neodymium rare earth and recovering trace cobalt elements from low-concentration magnetic material waste acid dissolution mother liquor. The method comprises the following steps that (1) valuable elements, cobalt and rare earth in the low-concentration magnetic material waste acid dissolution mother liquor are transferred into an organic extracting agent through a thorough extraction technology, organic liquor is prepared, an organic liquor feeding mode and a fuzzy foreordain grouping technology are adopted, and high-content praseodymium neodymium elements are finely divided into difficult-to-extract compositions and easy-to-extract compositions; (2) a difficult-to-extract composition separation technique and the easy-to-extract composition separation technique are connected into a technique for grouping separation, a cobalt-rich chloride material is obtained from the difficult-to-extract compositions, a lanthanum cerium enriched product is obtained from second difficult-to-extract compositions, a high-purity praseodymium neodymium enriched product is obtained from an intermediate aqueous phase, and a middle and heavy rare earth material is obtained from the easy-to-extract compositions; and (3) the obtained cobalt-rich material, the lanthanum cerium enriched product and the middleand heavy rare earth material can be separated through an existing mature extraction method, and pure cobalt and other rare earth pure products can be obtained.

Description

technical field [0001] The technology of the invention belongs to the rare earth separation technology, and in particular relates to a new method for preferentially extracting and separating praseodymium and neodymium rare earths and recovering trace cobalt elements from low-concentration magnetic material waste acid solution mother liquor. Background technique [0002] NdFeB waste is a rare earth magnetic material production process, in the batching, molding, sintering, cutting, grinding, magnetization and inspection and other processes will produce a large number of corner waste and unqualified products, because the current domestic and foreign rare earth magnetic materials It has a wide range of uses and various shapes. There are a lot of corner scraps in each process. In the whole production process, the finished product rate is only 65%-70%, and 30%-35% corner scraps are also produced. Horn waste is polluted to varying degrees during the production process and cannot be...

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Problems solved by technology

[0010] At present, there is a lack of a rationally designed new method for the preferential extraction and separation of praseodymium and neodymium rare earths and the recovery of trace cobalt elements from low-concentration magnetic material waste acid solution mother liquor

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