Method for preparing regenerated sintered NdFeB magnet by double-sided grinding of NdFeB sludge waste

A technology of neodymium iron boron and oil sludge, which is applied in the fields of magnetic objects, solid waste removal, inductance/transformer/magnet manufacturing, etc., can solve the problems of long production cycle, high cost, serious environmental pollution, etc. Short, the effect of reducing production costs

Active Publication Date: 2019-03-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The production cycle of the whole process is long, the cost is high, and the environmental pollution is serious

Method used

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  • Method for preparing regenerated sintered NdFeB magnet by double-sided grinding of NdFeB sludge waste
  • Method for preparing regenerated sintered NdFeB magnet by double-sided grinding of NdFeB sludge waste
  • Method for preparing regenerated sintered NdFeB magnet by double-sided grinding of NdFeB sludge waste

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Nd in the sintered NdFeB sludge waste from double-sided grinding ① No. 2 Fe 14 Phase B and Nd 2 o 3 Phase, the rare earth content is 31.72%, the carbon content is 0.55%, the oxygen content is 8.73%, the saturation magnetization is 96.76emu / g, and the coercive force is 0.92kOe. Take 30ml of double-sided grinding sludge and put it in a flask, add 150ml of absolute ethanol as a solvent, and vacuum distill at 80°C. After the liquid is evaporated to dryness, repeat the operation 5 times to obtain 25.32g of distilled powder. Distill the obtained distilled powder Put in a beaker. Prepare a dilute nitric acid aqueous solution with a concentration of 1vol.%, pour 127ml of dilute nitric acid solution into the oil sludge for ultrasonic cleaning, and keep stirring. During each cleaning process, the mixture is subjected to 10s ultrasonic treatment, and the above process is repeated 10 times. 120ml absolute ethanol sonicated once, 120ml acetone sonicated once. After removing the...

Embodiment 2

[0028] Nd in the sintered NdFeB sludge waste from double-sided grinding ② No. 2 Fe 14 Phase B and Nd 2 o 3 Phase, the rare earth content is 32.61%, the carbon content is 1.56%, the oxygen content is 4.40%, the saturation magnetization is 108.88emu / g, and the coercive force is 0.80kOe. Take 30ml of double-sided grinding sludge and put it in a flask, add 300ml of absolute ethanol as a solvent, and vacuum distill at 100°C. After the liquid is evaporated to dryness, repeat the operation 10 times to obtain 23.84g of distilled powder. Distill the obtained distilled powder Put in a beaker. Prepare a dilute nitric acid aqueous solution of 5vol.% concentration, pour 120ml of dilute nitric acid solution into the oil sludge for ultrasonic cleaning, and keep stirring, carry out 120s ultrasonic treatment to the mixture during each cleaning process, repeat the above process 15 times, and obtain the product using 120ml absolute ethanol was ultrasonicated 5 times, and 120ml acetone was ul...

Embodiment 3

[0031] Nd in the sintered NdFeB sludge waste from double-sided grinding ② No. 2 Fe 14 Phase B and Nd 2 o 3 Phase, the rare earth content is 32.61%, the carbon content is 1.56%, the oxygen content is 4.40%, the saturation magnetization is 108.88emu / g, and the coercive force is 0.80kOe. Take 30ml of double-sided grinding oil sludge and put it in a flask, add 240ml of absolute ethanol as a solvent, and vacuum distill at 90°C. After the liquid is evaporated to dryness, repeat the operation 8 times to obtain 24.20g of distilled powder. Distill the obtained distilled powder Put in a beaker. Prepare a dilute nitric acid aqueous solution of 3vol.% concentration, pour 121ml of dilute nitric acid solution into the oil sludge for ultrasonic cleaning, and keep stirring, carry out 60s ultrasonic treatment to the mixture during each cleaning process, repeat the above process 12 times, and obtain the product using 120ml absolute ethanol was ultrasonicated 3 times, and 120ml acetone was u...

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Abstract

The invention discloses a method for preparing a regenerative sintered neodymium-iron-boron magnet by using double-sided ground neodymium-iron-boron sludge wastes and belongs to the technical field of green recovery and efficient reuse of sintered neodymium-iron-boron sludge wastes. The method comprises the steps of double-sided ground sludge distillation, inorganic solvent ultrasonic cleaning, organic solvent ultrasonic cleaning, vacuum drying, doping of nano rare-earth hydride powder and sintering. The method has the characteristics of being short in process (sintered neodymium-iron-boron powder is directly obtained by adopting the double-sided ground and sintered neodymium-iron-boron sludge wastes as raw materials to prepare the sintered magnet), high in efficiency (the prepared magnet has relatively good magnetic property) and environment-friendly (no waste acid or waste liquid or waste gas is generated in the preparation process), and has a significant advantage in recovery cost.

Description

technical field [0001] The invention belongs to the technical field of green recovery and high-efficiency reuse of sintered NdFeB sludge waste, and relates to a short-flow method for preparing high-performance sintered NdFeB magnets by processing sintered NdFeB sludge waste with double-sided grinding. Background technique [0002] Sintered NdFeB magnetic materials have excellent magnetic and mechanical properties, and are widely used in many fields such as electronic information, household appliances, medical treatment, and aerospace. The annual output of sintered NdFeB magnetic materials has grown from a few hundred tons in the early 1980s to more than 150,000 tons in recent years, with an annual increase of more than 10%. However, in the production process of sintered NdFeB permanent magnet materials, about 30% of waste materials will be generated in various processes and use links. The types of waste materials include oil sludge generated during the grinding process, cutt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02B22F3/04B22F3/10B09B3/00
CPCB09B3/00B22F3/04B22F3/1017H01F1/0577H01F41/0266
Inventor 岳明刘伟露尹小文刘卫强刘敏张东涛
Owner BEIJING UNIV OF TECH
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