Method for preparing neodymium iron boron by using jet mill waste powder

A jet mill, neodymium iron boron technology, applied in the direction of electrical components, process efficiency improvement, magnetic materials, etc., can solve the problems of easy powder oxidation, unfavorable batch production, strict operation requirements, etc., to reduce activity and improve resistance Oxidation ability, anti-oxidation improvement effect

Active Publication Date: 2014-06-18
CHINALCO JINYUAN RARE EARTH
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  • Abstract
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Problems solved by technology

[0005] In the prior art, the published Chinese patent 201310113826 has introduced a method for preparing NdFeB ultrafine powder, which adds ultrafine powder to qualified powder, and this method can handle a small amount of ultrafine powder, but The method of processing ultrafine powder is too simple, the operation requirements are strict, and powder oxidation is prone to occur, which is not conducive to mass production

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  • Method for preparing neodymium iron boron by using jet mill waste powder
  • Method for preparing neodymium iron boron by using jet mill waste powder

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Embodiment 1

[0020] The airtight powder tank protected by argon gas is used to collect jet mill waste ultra-fine powder and refractory materials respectively. Add 0.4% anti-oxidant to the powder can with the ultrafine powder and mix for 1 hour. Re-add the refractory material to the jet mill and grind it into a 5.5 micron powder under the protection of argon. Then, under the protection of argon, the superfine powder and the refractory material were uniformly mixed at a ratio of 1:4 by weight for 2 hours, and then sieved in a 150-mesh ultrasonic sieving machine, and the oxygen content in the sieving process was controlled to be 250ppm. After the powder sieve is finished, let it stand still for 6 hours, then weigh the powder, orient and press it under a magnetic field forming press protected by argon under a magnetic field of 1.8T, and vacuum seal the compact with a vacuum packaging machine, and then press the The billets were put into an isostatic press and pressed under 250MPa, and the pac...

Embodiment 2

[0025] The airtight powder tank protected by argon gas is used to collect jet mill waste ultra-fine powder and refractory materials respectively. Add 0.45% anti-oxidant to the powder can with the ultrafine powder and mix for 1.5 hours. Re-add the refractory material to the jet mill and grind it into a powder of 6 microns under the protection of argon. Then, under the protection of argon, the superfine powder and the refractory material were uniformly mixed at a ratio of 1:1.5 by weight for 2 hours, and then sieved in a 200-mesh sieving machine, and the oxygen content in the sieving process was controlled to be 300ppm. After the powder sieve is finished, let it stand still for 8 hours, then weigh the powder, orient and press it under a magnetic field forming press protected by argon under a magnetic field of 2.0T, and vacuum seal the compact with a vacuum packaging machine, and then press Put the blank in an isostatic press and press it at 170MPa, peel off the packaging bag in...

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Abstract

The invention provides a method for preparing neodymium iron boron by using jet mill waste powder. The method is characterized by comprising the following steps: 1) pretreatment of raw materials; 2) sieving, namely putting mixed powder in the step 1) into a screening machine of which the sieve mesh number is 150-200 meshes to carry out sieving treatment, and standing for 5-8 hours after treatment is ended; 3) pressing and molding, namely putting the sieved powder into a molding press mold with stable gas protection, carrying out orientation in an orientation magnetic field of which the magnetic field strength is 1.4-2.0T and pressing and molding, so as to obtain a press billet; 4) carrying out post-treatment. Wastes in the production process can be fully utilized, and changed into treasures, and the ingredients of the produced product are close to the range of the normal material ingredients, so that the antioxidant ability is improved, the product yield is improved, and the production cost is reduced. Thus, the method has high social and economic benefits.

Description

technical field [0001] The invention relates to a method for preparing NdFeB permanent magnet materials, in particular to a method for preparing NdFeB by using jet mill waste powder. Background technique [0002] In the manufacturing process of sintered NdFeB powder, three types of powder are separated in the jet mill equipment: qualified powder (average particle size 3-5 microns), ultra-fine powder (particle size less than 2 microns) and refractory powder (particle size greater than 10 microns) , wherein the superfine powder accounts for 0.6-1% (wt), and the refractory material accounts for 1.5-3% (wt). [0003] Because the superfine ultrafine powder has high rare earth content and large surface area, it is extremely active and easy to oxidize and incinerate; too coarse refractory powder can’t shrink without adding an appropriate amount of rare earth because its composition deviates from the normal composition and the rare earth content is low, and it is too coarse After s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00B22F9/04B22F1/00H01F1/057
CPCY02P10/20
Inventor 黄伟超甘家毅李剑锋陈妙送
Owner CHINALCO JINYUAN RARE EARTH
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