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
View PDF5 Cites 27 Cited by
  • 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 reu

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Example one

[0016] The collected zinc-plated sintered NdFeB scrap is placed in a heating furnace and heated to 700°C—900°C. The product is heated to reddish and kept for 3-5 hours. After the zinc is oxidized, it will fall off the surface of the NdFeB. Then the neodymium iron boron waste is cooled at room temperature or air cooled, and taken out of the furnace. The taken out NdFeB material is processed by a shot blasting machine to remove the attachments on the surface of the NdFeB. Then use a jaw crusher to roughly crush the neodymium iron boron material into particles below 25mm, and then use the medium crusher to crush the material into powder below 3mm, and add rare earth hydrogen in the amount of 2-10wt% of the powder. The rare earth hydrides include neodymium, neodymium praseodymium, dysprosium iron, gadolinium iron or holmium iron hydride, and then stir for 1-3 hours to make the powders evenly mixed. The mixed powder is prepared by jet milling into fine powder of...

Example Embodiment

[0017] Example two

[0018] For the galvanized sintered NdFeB scrap with the mass ratio of the galvanized layer to the mass of the magnet less than 0.5%, the jaw crusher is used to roughly crush the scrap into particles below 25mm, and then the medium crusher is used to crush the materials into particles below 3mm. Diameter powder, add rare earth hydrides with a particle size of less than 3mm at 2-10wt% of the powder, the rare earth hydrides include neodymium, neodymium praseodymium, dysprosium iron, gadolinium iron or holmium iron hydride, and then stir 1 -3 hours to mix the powder evenly. The mixed powder is prepared by jet milling into fine powder of 3-5μm, and stirred again for 1-3 hours. Before each stirring, add the powdering additives in an amount of 1‰-5‰ of the mass ratio of the fine powder. The powdering additives include Gasoline and anti-oxidation protective agent. The mass ratio of gasoline to anti-oxidation protective agent is 5:2, and the anti-oxidation protectiv...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01F1/057H01F1/08H01F41/02
Inventor 邓晓飞王育平周子翔
Owner NINGBO KETIAN MAGNET
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap