CN102719725A - Sintered neodymium iron boron waste remoulding method - Google Patents
Sintered neodymium iron boron waste remoulding method Download PDFInfo
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- CN102719725A CN102719725A CN2012102368714A CN201210236871A CN102719725A CN 102719725 A CN102719725 A CN 102719725A CN 2012102368714 A CN2012102368714 A CN 2012102368714A CN 201210236871 A CN201210236871 A CN 201210236871A CN 102719725 A CN102719725 A CN 102719725A
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Abstract
The invention discloses a sintered neodymium iron boron waste remoulding method. The sintered neodymium iron boron waste remoulding method comprises the steps of: a), crushing neodymium iron boron bulky waste into powder smaller than 40 meshes, putting the powder into a jet mill, and pulverizing, wherein the rotation speed of the jet mill speed is set at 800-1000rpm, the interior of the jet mill is protected by nitrogen gas, and the oxygen content is controlled at 2ppm; b), filling the powder finely ground by the jet mill into a material barrel protected by the nitrogen gas, adding 1-2ml of gasoline and 0.2-1ml of an oxidation preventer into each kilogram of the powder, and putting the material barrel into a mixer for stirring and mixing; and c) moulding the mixed powder, and sintering into a neodymium iron boron magnet. The neodymium iron boron magnet prepared by the method has normal cross-section crystallization; abnormal coarse-grained phenomenon does not appear; the performance of the neodymium iron boron magnet is consistent with that before the neodymium iron boron magnet is processed; and a normal material flow can be adopted. The sintered neodymium iron boron waste remoulding method is easy and convenient to operate and convenient and direct to process; and by the sintered neodymium iron boron waste remoulding method, waste of resources can be reduced and cost can be saved.
Description
Technical field
The present invention relates to the method for neodymium iron boron waste material reshaping.
Background technology
The sintering and molding neodymium iron boron operation owing in first mold pressing system die trial and the big products moulding pressing process because of waste material can appear in reasons such as cracking, generally can regularly collect these waste materials.These block waste materials are because not static pressure such as process grade and sintering processes, and its density is low, breaks into these block waste materials into pieces 40 purpose meal, carry out the moulding compacting again, sintering is processed neodymium iron boron magnetic body.Because the waste material shelf-time is long, tangible powder particle can occurs and reunite.The product that adopts these waste material powder compression mouldings is behind oversintering, and the brilliant phenomenon of unusual grain can appear in the magnet section, and then influences the quality of coating after magnet is electroplated, and coating surface bubbles easily, comes off, and bright spot place magnetic property descends, and causes magnet to be scrapped.
At present, utilize method that the method for 1. from neodymium iron boron waste material, extracting neodymium or other REEs is arranged to this waste recovery, many, the complex process of this method operation, cost is high.2. break into waste material into pieces powder, be used as stub bar after sintering magnet into, melt down melting again, process neodymium iron boron magnetic body through powder process, moulding, sintering again.Or, again neodymium iron boron magnetic body is suppressed, sintered into to the broken powder of hydrogen through airflow milling powder process aftershaping with the broken powdered of stub bar hydrogen.Though above-mentioned two kinds of methods can be utilized this powder again, operation still is more, takes time and effort, and cost is still higher.
Summary of the invention
The method that The present invention be directed to the above-mentioned state of the art and provide a kind of sintering and molding neodymium iron boron waste material to utilize again reaches that operation is few, energy consumption is low, the purpose of cost savings.
The technical scheme that the present invention adopts is: the method for sintered NdFeB waste material reshaping, and its step comprises:
A), the block waste material of neodymium iron boron is broken into less than 40 purpose powder, put into airflow milling powder process, the airflow milling speed setting is 800～1000 rev/mins, adopts nitrogen protection in the airflow milling, control oxygen level≤2PPm;
B), in airflow milling levigated powder is packed charging basket with nitrogen protection into, and make an addition in the powder in the ratio that the per kilogram powder adds 1～2ml gasoline and the agent of 0.2～1ml protection against oxidation, charging basket is placed into carries out stir mixing on the mixer then;
C), will process neodymium iron boron magnetic body through powder compression moulding, the sintering after mixing powder.
The powder delivery speed of the airflow milling in the said a) step is 2～4kg/ minute.
Said b) the protection against oxidation agent comprises polyethylene oxide allyl ethers or polyethylene oxide glycidyl allyl ether in the step.
Said b) powder stir mixing speed in the charging basket of nitrogen protection is 200～300 kg/ hours in the step.
Said c) sintering carries out in less than the sintering oven of 2Pa in vacuum tightness in the step, and sintering temperature is 1080～1115 ℃ of sintering 3.5～4.5 hours.
The characteristics of present method are: only need that the moulding waste material is returned mill through airflow milling and just can circulate by normal powder.Utilize airflow milling powder process principle, in airflow milling mill chamber, the powder particle of agglomerated mutual bump under the effect of nitrogen gas stream becomes the single crystal powder again, makes the no abnormal coarse-grain phenomenon of powder sintered back blank section.
The key of present method is the setting that the moulding waste material returns processing parameter when grinding again:
1)The separation wheel of airflow milling is set at the slow speed of revolution when returning mill: 800～1000 commentaries on classics/min.Because it is thinner to return the abrasive dust material granularity, this slow speed of revolution is set and can effectively the polycrystal powder particle of reuniting be become single crystal particle again, and the granularity of powder can further not attenuate and cause following process difficulty and complicated simultaneously;
2)Return in the mill process and adopt nitrogen protection, control oxygen level≤2PPm because powder particle is tiny, is prone to oxidation, therefore returns strict control oxygen level in the mill process;
3) returnPowder behind the mill adds gasoline and the agent of 0.2～1ml/kg protection against oxidation of 1～2ml/kg and stirs, because gasoline and the protection against oxidation agent added are originally volatilized in anti-mill process, needs suitably to add gasoline and protective material again again.
Adopt present method to process neodymium iron boron magnetic body again, the section crystallization of magnet is normal, unusual coarse-grain phenomenon do not occur, and magnet performance is preceding consistent with processing, can be by normal material circulation.This method is simple to operation, and convenient processing is direct, can reduce the wasting of resources simultaneously, practices thrift cost.
Embodiment
Below in conjunction with embodiment the present invention is further specified.
With the method for the block waste material employing cobbing of scrapping in the neodymium iron boron magnetic body molding procedure, utilize rubber hammer to be broken into waste material less than 40 purpose meal.Meal is put into airflow milling powder process, and the airflow milling speed setting is 800～1000 rev/mins, adopts nitrogen protection in the airflow milling, control oxygen level≤2PPm, and the powder delivery speed control was at 2～4 kg/ minutes.Airflow milling levigated powder is packed in the charging basket with nitrogen protection; And in charging basket, add 1～2ml gasoline and the protectant ratio of 0.2～1ml in the per kilogram powder; Add gasoline and protection against oxidation agent; Said protection against oxidation agent comprises polyethylene oxide allyl ethers or polyethylene oxide glycidyl allyl ether, will be placed on the mixer with the charging basket of nitrogen protection then and stir.Powder was by 200～300kg/ hour, and stir mixing is after mixed powder is weighed; Put into the mould of moulding press, add magnetic field orientating, compression moulding; Green compact are taken out in demagnetization then; Vacuumize encapsulation rapidly, more packaged blank is put into the isostatic pressing machine 150～200Mpa that pressurizes, the green compact of processing are taken out in pressurize after 1～3 minute; Green compact are packed into behind the magazine, put into the sintering oven sintering of vacuum tightness, from sintering oven, take out after 3.5～4.5 hours, promptly process neodymium iron boron magnetic body at sintering under 1080～1115 ℃ the sintering temperature less than 2Pa.
Claims (5)
1. the method for sintered NdFeB waste material reshaping, its step comprises:
A), the block waste material of neodymium iron boron is broken into less than 40 purpose powder, put into airflow milling powder process, the airflow milling speed setting is 800～1000 rev/mins, adopts nitrogen protection in the airflow milling, control oxygen level≤2PPm;
B), in airflow milling levigated powder is packed charging basket with nitrogen protection into, and make an addition in the powder in the ratio that the per kilogram powder adds 1～2ml gasoline and the agent of 0.2～1ml protection against oxidation, charging basket is placed into carries out stir mixing on the mixer then;
C), will process neodymium iron boron magnetic body through powder compression moulding, the sintering after mixing powder.
2. the method for sintered NdFeB waste material reshaping according to claim 1 is characterized in that the powder delivery speed of the airflow milling in the said a) step is 2～4kg/ minute.
3. the method for sintered NdFeB waste material reshaping according to claim 1 is characterized in that said b) step in the protection against oxidation agent comprise polyethylene oxide allyl ethers or polyethylene oxide glycidyl allyl ether.
4. the method for sintered NdFeB waste material reshaping according to claim 1 is characterized in that said b) use in the step that stir mixing speed is 200～300 kg/ hours in the charging basket of nitrogen protection.
5. the method for sintered NdFeB waste material reshaping according to claim 1 is characterized in that said c) sintering carries out in less than the sintering oven of 2Pa in vacuum tightness in the step, and sintering temperature is 1080～1115 ℃ of sintering 3.5～4.5 hours.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103426579A (en) * | 2013-09-05 | 2013-12-04 | 宁波科田磁业有限公司 | Method for recycling nickel-plated sintered NdFeB waste |
| CN103440948A (en) * | 2013-08-16 | 2013-12-11 | 宁波科田磁业有限公司 | Reusing method for galvanization sintered neodymium iron boron waste |
| CN103866126A (en) * | 2014-02-27 | 2014-06-18 | 中铝广西有色金源稀土股份有限公司 | Method for preparing neodymium iron boron by using jet mill waste powder |
| CN103934450A (en) * | 2014-03-26 | 2014-07-23 | 辽宁五寰科技发展有限公司 | Method for reusing sintered reclaimed NdFeB material |
| CN104376943A (en) * | 2014-11-21 | 2015-02-25 | 湖南航天磁电有限责任公司 | Recycling and reusing method for sintered Nd-Fe-B forming waste |
| CN104439256A (en) * | 2014-11-24 | 2015-03-25 | 湖南航天磁电有限责任公司 | Method for recycling and reusing sintered Nd-Fe-B oxidation blank |
| CN104801719A (en) * | 2015-05-07 | 2015-07-29 | 安徽万磁电子有限公司 | Recycling technique for nickel-plated sintered NdFeB wastes |
| CN104801717A (en) * | 2015-05-07 | 2015-07-29 | 安徽万磁电子有限公司 | Recycling technique for galvanized sintered NdFeB wastes |
| CN105274417A (en) * | 2015-10-20 | 2016-01-27 | 宁波科田磁业有限公司 | Method for utilizing neodymium iron boron airflow mill tailings for preparing neodymium iron boron magnetic steel |
| CN106373688A (en) * | 2016-08-31 | 2017-02-01 | 浙江东阳东磁稀土有限公司 | Method for preparing rare earth permanent magnet material |
| CN106601404A (en) * | 2016-12-28 | 2017-04-26 | 湖南稀土金属材料研究院 | Method for reforming sintered neodymium-iron-boron waste blank |
| CN106920613A (en) * | 2017-02-28 | 2017-07-04 | 湖南稀土新能源材料有限责任公司 | The method that plating overcoat sintered NdFeB waste material is recycled |
| CN108115144A (en) * | 2017-08-19 | 2018-06-05 | 福建省长汀金龙稀土有限公司 | A kind of reuse method of rare earth alloy powder reclaimed materials |
| CN109192486A (en) * | 2018-08-13 | 2019-01-11 | 湖南航天磁电有限责任公司 | A kind of recycling and reusing method of sintering and molding neodymium iron boron molding die cleaning materials |
| CN114023553A (en) * | 2021-11-15 | 2022-02-08 | 山西大缙华磁性材料有限公司 | Process method for manufacturing high-consistency sintered neodymium-iron-boron permanent magnet |
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| CN103440948A (en) * | 2013-08-16 | 2013-12-11 | 宁波科田磁业有限公司 | Reusing method for galvanization sintered neodymium iron boron waste |
| CN103440948B (en) * | 2013-08-16 | 2016-02-24 | 宁波科田磁业有限公司 | A kind of reuse method of zinc-plated sintered NdFeB waste material |
| CN103426579A (en) * | 2013-09-05 | 2013-12-04 | 宁波科田磁业有限公司 | Method for recycling nickel-plated sintered NdFeB waste |
| CN103426579B (en) * | 2013-09-05 | 2016-02-24 | 宁波科田磁业有限公司 | A kind of reuse method of nickel plating sintered NdFeB waste material |
| CN103866126B (en) * | 2014-02-27 | 2015-11-18 | 中铝广西有色金源稀土股份有限公司 | A kind of airflow milling powder that gives up that utilizes prepares the method for neodymium iron boron |
| CN103866126A (en) * | 2014-02-27 | 2014-06-18 | 中铝广西有色金源稀土股份有限公司 | Method for preparing neodymium iron boron by using jet mill waste powder |
| CN103934450A (en) * | 2014-03-26 | 2014-07-23 | 辽宁五寰科技发展有限公司 | Method for reusing sintered reclaimed NdFeB material |
| CN104376943A (en) * | 2014-11-21 | 2015-02-25 | 湖南航天磁电有限责任公司 | Recycling and reusing method for sintered Nd-Fe-B forming waste |
| CN104439256A (en) * | 2014-11-24 | 2015-03-25 | 湖南航天磁电有限责任公司 | Method for recycling and reusing sintered Nd-Fe-B oxidation blank |
| CN104801717A (en) * | 2015-05-07 | 2015-07-29 | 安徽万磁电子有限公司 | Recycling technique for galvanized sintered NdFeB wastes |
| CN104801719A (en) * | 2015-05-07 | 2015-07-29 | 安徽万磁电子有限公司 | Recycling technique for nickel-plated sintered NdFeB wastes |
| CN105274417A (en) * | 2015-10-20 | 2016-01-27 | 宁波科田磁业有限公司 | Method for utilizing neodymium iron boron airflow mill tailings for preparing neodymium iron boron magnetic steel |
| CN106373688A (en) * | 2016-08-31 | 2017-02-01 | 浙江东阳东磁稀土有限公司 | Method for preparing rare earth permanent magnet material |
| CN106373688B (en) * | 2016-08-31 | 2019-03-29 | 浙江东阳东磁稀土有限公司 | A method of preparing rare earth permanent-magnetic material |
| CN106601404A (en) * | 2016-12-28 | 2017-04-26 | 湖南稀土金属材料研究院 | Method for reforming sintered neodymium-iron-boron waste blank |
| CN106920613A (en) * | 2017-02-28 | 2017-07-04 | 湖南稀土新能源材料有限责任公司 | The method that plating overcoat sintered NdFeB waste material is recycled |
| CN108115144A (en) * | 2017-08-19 | 2018-06-05 | 福建省长汀金龙稀土有限公司 | A kind of reuse method of rare earth alloy powder reclaimed materials |
| CN108115144B (en) * | 2017-08-19 | 2021-01-15 | 福建省长汀金龙稀土有限公司 | Recycling method of rare earth alloy powder reclaimed material |
| CN109192486A (en) * | 2018-08-13 | 2019-01-11 | 湖南航天磁电有限责任公司 | A kind of recycling and reusing method of sintering and molding neodymium iron boron molding die cleaning materials |
| CN114023553A (en) * | 2021-11-15 | 2022-02-08 | 山西大缙华磁性材料有限公司 | Process method for manufacturing high-consistency sintered neodymium-iron-boron permanent magnet |
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Address after: 315031 Cicheng Town West Gate, Jiangbei District, Ningbo City, Zhejiang Province Patentee after: Ningbo Ketian Magnetic Industry Co.,Ltd. Patentee after: NINGBO JINTIAN COPPER (GROUP) Co.,Ltd. Address before: 315034, No. 1 West Chengxi Road, Ningbo, Zhejiang Patentee before: NINGBO KETIAN MAGNET Co.,Ltd. Patentee before: NINGBO JINTIAN COPPER (GROUP) Co.,Ltd. |
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