CN102719725B - Sintered neodymium iron boron waste remoulding method - Google Patents
Sintered neodymium iron boron waste remoulding method Download PDFInfo
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- CN102719725B CN102719725B CN201210236871.4A CN201210236871A CN102719725B CN 102719725 B CN102719725 B CN 102719725B CN 201210236871 A CN201210236871 A CN 201210236871A CN 102719725 B CN102719725 B CN 102719725B
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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
Sintering and molding neodymium iron boron operation due in first mold pressing die trial processed and large specification product moulding pressing process because the reasons such as cracking there will be waste material, generally can regularly collect these waste materials.These block waste materials are because process not waits static pressure and sintering processes, and its density is low, breaks into these block waste materials into pieces 40 object meal, then carry out moulding compacting, sintering is made neodymium iron boron magnetic body.Because the waste material resting period is long, there will be obvious powder particle to reunite.Adopt the product of these waste material powder pressing moulding after oversintering, magnet section there will be the brilliant phenomenon of abnormal grain, and then affects the quality of coating after magnet is electroplated, and coating surface easily bubbles, comes off, and bright spot place magnetic property declines, and causes magnet to be scrapped.
At present, to this waste recovery, utilize method to have the method for 1. extracting neodymium or other rare earth elements from neodymium iron boron waste material, this method operation is many, complex process, and cost is high.2. break into waste material into pieces powder, be used as stub bar after sintering magnet into, again melt down melting, then make neodymium iron boron magnetic body through powder process, moulding, sintering.Or stub bar hydrogen is broken into powder, then neodymium iron boron magnetic body is suppressed, sintered into the broken powder of hydrogen through airflow milling powder aftershaping.Though above-mentioned two kinds of methods can recycle this powder, operation or more, takes time and effort, and cost is still higher.
Summary of the invention
The present invention be directed to the above-mentioned state of the art and the method for a kind of sintering and molding neodymium iron boron waste material recycling is provided, reach that operation is few, energy consumption is low, the object of cost savings.
The technical solution used in the present invention 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 and is less than 40 object powder, put into airflow milling powder process, airflow milling speed setting is 800～1000 revs/min, adopts nitrogen protection in airflow milling, controls oxygen content≤2PPm;
B), through the levigate powder of airflow milling, pack into in the charging basket of nitrogen protection, and make an addition in powder in the ratio that per kilogram powder adds 1～2ml gasoline and the agent of 0.2～1ml protection against oxidation, then charging basket is placed into and on batch mixer, carries out stir mixing;
C), by powder pressing moulding, sintering after mixed powder, make neodymium iron boron magnetic body.
The powder delivery speed of the airflow milling in described a) step is 2～4kg/ minute.
Described b) in step, protection against oxidation agent comprises poly(ethylene oxide) allyl ether or poly(ethylene oxide) allyl glycidyl ether.
Described b) in step, powder stir mixing speed in the charging basket of nitrogen protection is 200～300 kg/ hour.
Described c) in step, sintering carries out in vacuum degree is less than the sintering furnace of 2Pa, and sintering temperature is 1080～1115 ℃ of sintering 3.5～4.5 hours.
The feature of this method is: only moulding waste material need be returned to mill by airflow milling and just can circulate by normal powder.Utilize airflow milling powder principle, in airflow milling mill chamber, the powder particle of agglomerated mutual shock under the effect of nitrogen stream becomes monocrystal powder again, makes powder sintered rear blank section without abnormal coarse-grain phenomenon.
The key of this method is the setting that moulding waste material returns technological parameter while grinding again:
1)while returning mill, the separation wheel of airflow milling is set as the slow-speed of revolution: 800～1000 turn/min.Owing to returning, abrasive dust material granularity is thinner, and this slow-speed of revolution is set can become single crystal grain by the polycrystal powder particle of reunion effectively again, and the granularity of powder can further not attenuate and cause following process difficulty and complicated simultaneously;
2)return in mill process and adopt nitrogen protection, control oxygen content≤2PPm, because powder particle is tiny, oxidizable, therefore return the strict oxygen content of controlling in mill process;
3) returnpowder after mill adds gasoline and the agent of 0.2～1ml/kg protection against oxidation of 1～2ml/kg and stirs, and because gasoline and the protection against oxidation agent originally added are volatilized in anti-mill process, needs suitably to add gasoline and protective agent again again.
Adopt this method to make neodymium iron boron magnetic body, the section crystallization of magnet is normal, does not occur abnormal coarse-grain phenomenon again, and magnet performance is consistent with before processing, can be by normal material circulation.The method is simple to operation, and it is directly convenient to process, and can reduce the wasting of resources simultaneously, cost-saving.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
The block waste material of scrapping in neodymium iron boron magnetic body molding procedure is adopted to the method for cobbing, utilize rubber hammer that waste material is broken into and is less than 40 object meal.Meal is put into airflow milling powder process, and airflow milling speed setting is 800～1000 revs/min, adopts nitrogen protection in airflow milling, controls oxygen content≤2PPm, and powder delivery speed is controlled at 2～4 kg/ minute.The levigate powder of airflow milling is packed into in the charging basket of nitrogen protection; and in per kilogram powder, add 1～2ml gasoline and the protectant ratio of 0.2～1ml in charging basket; add gasoline and protection against oxidation agent; described protection against oxidation agent comprises poly(ethylene oxide) allyl ether or poly(ethylene oxide) allyl glycidyl ether, then the charging basket with nitrogen protection is placed on batch mixer and is stirred.Powder is by 200～300kg/ hour, stir mixing, after mixed powder material weighing, the mould of putting into moulding press, adds magnetic field orientating, compressing, then green compact are taken out in demagnetization, vacuumize rapidly encapsulation, more packaged blank is put into the isostatic pressing machine 150～200Mpa that pressurizes, the green compact of making are taken out in pressurize after 1～3 minute; Green compact are packed into after magazine, put into the sintering furnace sintering that vacuum degree is less than 2Pa, under the sintering temperature of 1080～1115 ℃, sintering, after 3.5～4.5 hours, takes out from sintering furnace, makes neodymium iron boron magnetic body.
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 and is less than 40 object powder, put into airflow milling powder process, airflow milling speed setting is 800～1000 revs/min, adopts nitrogen protection in airflow milling, controls oxygen content≤2ppm;
B), through the levigate powder of airflow milling, pack into in the charging basket of nitrogen protection, and make an addition in powder in the ratio that per kilogram powder adds 1～2ml gasoline and the agent of 0.2～1ml protection against oxidation, then charging basket is placed into and on batch mixer, carries out stir mixing;
C), by powder pressing moulding, sintering after mixed powder, make neodymium iron boron magnetic body.
2. the method for sintered NdFeB waste material reshaping according to claim 1, the powder delivery speed that it is characterized in that the airflow milling in described a) step is 2～4kg/ minute.
3. the method for sintered NdFeB waste material reshaping according to claim 1, is characterized in that described b) in step protection against oxidation agent comprise poly(ethylene oxide) allyl ether or poly(ethylene oxide) allyl glycidyl ether.
4. the method for sintered NdFeB waste material reshaping according to claim 1, is characterized in that described b) by stir mixing speed in the charging basket of nitrogen protection, be 200～300 kg/ hour in step.
5. the method for sintered NdFeB waste material reshaping according to claim 1, is characterized in that described c) sintering carries out in vacuum degree is less than the sintering furnace of 2Pa in step, and sintering temperature is 1080～1115 ℃ of sintering 3.5～4.5 hours.
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| 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 |
| 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 |
| CN103934450B (en) * | 2014-03-26 | 2015-08-12 | 辽宁五寰科技发展有限公司 | The reuse method of sintered NdFeB reclaimed materials |
| 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 |
| CN104801719B (en) * | 2015-05-07 | 2017-12-19 | 安徽万磁电子有限公司 | A kind of recycling technique of nickel plating sintered NdFeB waste material |
| CN104801717B (en) * | 2015-05-07 | 2017-11-14 | 安徽万磁电子有限公司 | A kind of recycling technique of zinc-plated sintered NdFeB waste material |
| CN105274417B (en) * | 2015-10-20 | 2018-09-14 | 宁波科田磁业有限公司 | A method of preparing Nd-Fe-B magnet steel using neodymium-iron-boron air stream millby tailing |
| 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 |
| CN106601404B (en) * | 2016-12-28 | 2019-02-26 | 湖南稀土金属材料研究院 | The method of sintered NdFeB scrap body material reshaping |
| CN106920613B (en) * | 2017-02-28 | 2018-12-07 | 湖南稀土新能源材料有限责任公司 | Plate the method that protective layer sintered NdFeB waste material recycles |
| 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 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101071668B (en) * | 2006-05-08 | 2011-05-11 | 肇庆三环京粤磁材有限责任公司 | Method for preparing sintered Nd-Fe-B alloy magnetic material |
| CN101952915A (en) * | 2008-02-20 | 2011-01-19 | 株式会社爱发科 | Method for regenerating scrap magnets |
| CN102101120A (en) * | 2009-12-21 | 2011-06-22 | 上海爱普生磁性器件有限公司 | Method for recycling boned neodymium iron boron permanent magnet defective product |
| CN101871072A (en) * | 2010-06-02 | 2010-10-27 | 山西金山磁材有限公司 | Method for recovering, smelting and reusing base material in jet mill procedure for sintered NdFeB production |
| CN202061677U (en) * | 2011-01-19 | 2011-12-07 | 三环瓦克华（北京）磁性器件有限公司 | Powder screening device for sintering NdFeB (neodymium iron boron) magnet material |
| CN102211192B (en) * | 2011-06-09 | 2012-12-26 | 天津一阳磁性材料有限责任公司 | Method for preparing high-performance neodymium iron boron by using secondary recycled materials |
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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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