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Reusing method for galvanization sintered neodymium iron boron waste

A neodymium iron boron and waste technology, applied in the direction of magnetic materials, inorganic material magnetism, inductance/transformer/magnet manufacturing, etc., can solve the problems of serious environmental pollution, rare earth loss, high cost, avoid environmental pollution, and reduce the loss of rare earth elements , the effect of simple reuse process

Active Publication Date: 2013-12-11
NINGBO KETIAN MAGNET +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Valuable elements in NdFeB waste are extracted by chemical separation, and their reuse has problems such as serious environmental pollution, high cost, and loss of rare earths.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put the collected galvanized and sintered NdFeB waste into a heating furnace to heat up to 700°C-900°C. The product is heated to reddish and kept for 3-5 hours. Zinc is oxidized and falls off from the NdFeB surface. Then cool the NdFeB waste to room temperature or wind, and take it out of the furnace. The taken out NdFeB material is processed by a shot blasting machine to remove the attachments on the NdFeB surface. Then use a jaw crusher to roughly crush the NdFeB material into particles with a size below 25mm, and then use a secondary crusher to crush the material into powder with a particle size below 3mm, and add rare earth hydrogenation according to the amount of 2-10wt% of the powder. The rare earth hydrides include neodymium, praseodymium neodymium, dysprosium iron, gadolinium iron or holmium iron hydrides, and then stir for 1-3 hours to make the powder mix evenly. The mixed powder is prepared into a fine powder of 3-5 μm by jet mill, and stirred for 1-3 hours a...

Embodiment 2

[0018] For galvanized sintered NdFeB waste whose ratio of galvanized layer mass to magnet mass is less than 0.5%, use jaw crusher to coarsely crush the waste into particles with specifications below 25mm, and then use secondary crusher to crush the materials into particles below 3mm The powder material of 2-10wt% is added the rare earth hydride of particle size below 3mm by the 2-10wt% of powder, and described rare earth hydride comprises the hydride of neodymium, praseodymium neodymium, dysprosium iron, gadolinium iron or holmium iron, then stirs 1 -3 hours, make the powder mix evenly. The mixed powder is prepared into a fine powder of 3-5 μm by jet mill, and then stirred again for 1-3 hours, and powder-making additives are added according to the mass ratio of fine powder of 1‰-5‰ before each stirring, and the powder-making additives include Gasoline and oxidation protection. The mass ratio of gasoline to anti-oxidation protective agent is 5:2, and the anti-oxidation protect...

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Abstract

Provided is a reusing method for galvanization sintered neodymium iron boron waste. A galvanization layer is removed through a hot deplating method, then milling, forming and sintering are carried out, neodymium iron boron materials of middle-high marks are prepared; for galvanization sintered neodymium iron boron waste with the ratio of galvanization layer weight to magnet weight smaller than 0.5%, zinc can be regarded as an impurity which cannot be removed, hot deplating is not carried out, crushing and milling are directly carried out, then pressing forming and sintering are carried out again, and neodymium iron boron materials of middle-low marks are prepared. According to the reusing method, environment pollution caused by chemical deplating is completely avoided, the reusing process of the valuable elements in the neodymium iron boron waste is simple, and rare earth element loss is low.

Description

technical field [0001] The invention relates to NdFeB permanent magnet materials, and relates to a method for reusing galvanized sintered NdFeB waste materials. Background technique [0002] The surface of the sintered NdFeB material is galvanized to be a finished product. The waste of galvanized finished products generally adopts the chemical deplating process to remove the galvanized layer and then separate the rare earths. CN1295357C announced a method for recovering valuable elements in NdFeB waste, which includes four processes: rare earth extraction recovery and separation process, cobalt oxide recovery and separation process, iron oxide recovery process and discharge liquid recovery process, rare earth extraction recovery and separation process The purity of neodymium oxide is 99.5%, the purity of dysprosium oxide is 99.5%, and the purity of terbium oxide is 99.5%. The cobalt oxide recovery and separation process obtains cobalt oxide products with a purity of 99.5%. T...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02
Inventor 邓晓飞王育平周子翔
Owner NINGBO KETIAN MAGNET
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