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Recovery method of valuable element in neodymium iron boron waste material

A technology of valuable element and recovery method, applied in the direction of ammonium salt fertilizer, process efficiency improvement, application, etc., can solve the problems of wasting valuable resources, single rare earth, polluting the environment, etc., and achieve the effect of low cost

Active Publication Date: 2005-11-09
西安西骏新材料有限公司
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Problems solved by technology

[0003] At present, the commonly used production process for the recovery of NdFeB waste focuses on the recovery of rare earths by fluoride precipitation and double salt precipitation. A large amount of ammonia nitrogen wastewater is discharged, wasting a lot of valuable resources, seriously polluting the environment, and the recovered rare earth is not a single product

Method used

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Embodiment

[0013] The recovery method of valuable elements in the NdFeB waste of the present invention comprises the following steps:

[0014] (1) Rare earth extraction, recovery and separation process: use concentrated sulfuric acid to prepare 2-2.5mol / l sulfuric acid solution in an acid-resistant and ventilated dissolver, slowly add NdFeB waste materials under stirring, and dissolve to make the final acidity PH = 4.5-5, add an appropriate amount of No. 3 flocculant (0.3% aqueous solution) to coagulate the undissolved suspended matter, filter with a plate and frame filter press to obtain filter residue and feed liquid, return the filter residue to the solvent tank to continue dissolving, and the filtrate enters the P507-kerosene system 23 Iron and rare earths are separated in a three-stage extraction tank. The extraction tank should be sealed to prevent iron from being oxidized. There are three stages of saponification, 10 stages of extraction, and 10 stages of washing. Separation proce...

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Abstract

A process for recovering the valuable elements from the rejected NdFeB material includes such steps as RE extracting-separating to recover neodymium oxide, dysprosium oxide and terbium oxide, cobalt oxide separating to recover cobalt oxide, iron oxide separating to recover iron oxide, and reclaiming the discharged liquid to recover hydrochloric acid and distilled water.

Description

technical field [0001] The invention relates to the technical field of energy chemical industry and resource clean utilization, in particular to a method for recovering valuable elements in NdFeB waste. Background technique [0002] NdFeB permanent magnet is a kind of permanent magnet material with superior performance, which is widely used in various high-tech fields. The industrialization process of this industry has only a history of nearly 10 years, and it is a new industry. Due to the production process and use factors, 30% of scraps and unqualified products will be produced in the production process and use process, but its composition is completely consistent with the finished product, and its composition is about Nd: 25%, Dy: 2-8%, Co: 1-4%, Fe: 60-65% and exist in the form of alloys, all valuable elements can be recycled and reused, the annual output of NdFeB permanent magnets in the world is about 40,000 tons, and the scraps produced are extremely unqualified The pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/20
CPCY02P10/20
Inventor 周成钢
Owner 西安西骏新材料有限公司
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