WO2007119846A1 - 希土類-鉄-ボロン系磁石スクラップからの有用材料回収方法 - Google Patents
希土類-鉄-ボロン系磁石スクラップからの有用材料回収方法 Download PDFInfo
- Publication number
- WO2007119846A1 WO2007119846A1 PCT/JP2007/058249 JP2007058249W WO2007119846A1 WO 2007119846 A1 WO2007119846 A1 WO 2007119846A1 JP 2007058249 W JP2007058249 W JP 2007058249W WO 2007119846 A1 WO2007119846 A1 WO 2007119846A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rare earth
- iron
- boron
- scrap
- thermite reaction
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B59/00—Obtaining rare earth metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B61/00—Obtaining metals not elsewhere provided for in this subclass
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a method for recovering useful materials such as rare earth-iron-boron-based magnet scraps, such as rare earth elements, boron, and iron, and particularly to a method for recovering boron and iron as ferroboron and rare earth elements as oxides.
- Rare earth ferrous rare earth magnets typically boron-based sintered magnets, are used in HDD VCMs, motors, MRI, and the like. Many rare earth magnets are also used in hybrid cars that have recently attracted particular attention due to the problem of rising oil prices and global warming. In this way, rare earth magnets are increasingly used, and the amount of magnets used is increasing.
- rare earth-iron-boron-based sintered magnets are produced by press-forming alloy powders for rare-earth-iron-boron-based magnets, which have been adjusted in particle size, into a predetermined shape in a magnetic field, firing them, and then processing into final shapes to prevent Manufactured with cocoon treatment.
- the rare earth-iron-boron magnet alloy powder is prepared by, for example, melting a rare earth metal or alloy, ferroboron, pure iron, etc., prepared to have a target composition, using a high frequency melting furnace. Thereafter, it is cooled by a strip casting method or a molding method to obtain flakes or lumps, and after heat treatment, it is pulverized to a certain range of particle sizes.
- scrap is generated due to molding defects, sintering defects, and defective plating.
- scraps such as grinding powder and polishing powder are also generated by wire cutting and mortar polishing performed when adjusting the size and shape of the magnet to a predetermined size.
- discarded magnets are also generated from electrical products, automobiles, etc. that are discarded due to breakdowns or lifetimes. These magnet scraps contain several tens of weight percent of rare earth elements that are valuable in terms of resources, and the recovery and reuse of rare earth elements and other useful materials contained in these scraps are being considered.
- Patent Documents 1 and 2 describe that the scraps and the like are immersed in an acid solution and in the solution.
- a method of recovering rare earth elements in the supernatant liquid by allowing oxygen to pass through to precipitate iron in the rare earth magnet as iron hydroxide is disclosed.
- a large amount of pig iron hydroxide is also recovered.
- the iron hydroxide is mixed with boron that affects the hardenability of iron even in the presence of about lOppm, the iron hydroxide is used as an iron ore raw material or a steelmaking raw material in order to produce steel products. It cannot be used in a mixed manner, and the processing is not complete.
- Patent Document 3 proposes a method for removing boron from boron-containing alloy sludge that can be used for removing boron.
- this method also has an economical problem because it requires treatment such as removal of boron with ion exchange resin.
- Patent Documents 4 to 7 describe that a rare earth element oxide formed on the surface layer of a sintered powder of a rare earth sintered magnet is reduced with metallic calcium and regenerated as a raw material for a rare earth magnet.
- a method to remove acid calcium and unreacted metallic calcium by multiple water washings has been proposed! Speak. This method is not advantageous in terms of economy, for example, it requires a heating furnace to ensure the temperature required for the reaction and requires multiple washings.
- rare earth sintered magnets are manufactured in various compositions depending on performance and application, and the amount thereof is not constant. Therefore, in the field of processing rare earth sintered magnet polishing powder, rare earth sintered magnet polishing powders of various compositions are mixed and processed, and the resulting raw material for rare earth magnets has its composition and magnet performance. Is not stable, so the application is extremely limited. For this reason, in order to use a raw material mixed with the above various elements as a general raw material for magnet production, it is necessary to analyze the composition and add a short amount of raw material to the target composition. This is one of the causes of economic loss.
- ferroboron is generally manufactured by a method in which mill scale generated in the steel industry is used as a main raw material, boric acid and aluminum powder are mixed, ignited to cause a thermite reaction, and alloyed. Is done.
- Patent Document 1 Japanese Patent Laid-Open No. 5-287405
- Patent Document 2 Japanese Patent Laid-Open No. 9-217132
- Patent Document 3 Japanese Patent Laid-Open No. 2002-275548
- Patent Document 4 Japanese Patent Laid-Open No. 2000-91811
- Patent Document 5 JP 2001-335815 A
- Patent Document 6 Japanese Patent Laid-Open No. 2002-356724
- Patent Document 7 Japanese Unexamined Patent Application Publication No. 2004-91811
- Patent Document 8 Japanese Patent Laid-Open No. 2005-2463
- An object of the present invention is to make it possible to recover iron and boron as ferroboron from rare earth-iron-iron-boron magnet scrap, and also to recover rare-earth elements as oxides efficiently. It is to provide a method for recovering useful materials from boron-based magnet scrap.
- a method for recovering useful materials from rare earth-iron-boron-based magnet scrap containing at least a rare earth element, iron and boron comprising steps A to D. .
- Process B Rare earth and ferrous boron-based magnet scrap oxidized in Process A, aluminum and iron A step of preparing a thermite reaction mixture containing at least one selected from the group consisting of aluminum alloy and an oxidizing agent, if necessary;
- Step C a step of subjecting the thermite reaction mixture to the thermite reaction to produce ferroboron and slag;
- Step D A step of separating the ferroboron and slag obtained in step C.
- step E there is also provided the above recovery method including step E.
- Step E A step of separating the slag separated in step D into an aluminum-containing material and a rare earth element-containing material.
- the recovery method of the present invention includes the steps A to D described above, and in particular, acts as a reducing agent for the rare earth-iron-boron-based magnet scrap that has undergone aluminum oxidation in the thermite reaction of the step C. Therefore, boron and iron can be recovered as ferroboron. Further, by mixing iron oxide, boric acid or the like with the thermite reaction mixture, the boron boron having a desired composition can be recovered.
- the recovery method of the present invention includes step E above, so that rare earth elements can also be efficiently recovered, and useful materials contained in rare earth-iron-boron-based magnet scrap can be recovered without waste and reused. Can do.
- the recovery method of the present invention includes, as Step A, a step of oxidizing rare earth-iron-boron magnet scrap in an oxygen-containing atmosphere.
- the magnet scrap used in process A is a magnet scrap containing rare earth elements, iron, and boron.
- rare earth ferrous boron-based magnet Including rare earth-ferrous iron-based magnets or alloys for rare earth-iron-iron-boron-based magnets, including discarded magnets that are generated when electric appliances, cars, etc. used in the product are discarded due to failure or lifetime. means.
- the use of sintered magnets and bonded magnets is not limited.
- Rare earth ferrous boron-based magnets contain cobalt, Some contain transition metals such as minium and copper. These scraps can also be used as magnet scraps in the above step A, and also rare earth-iron-iron-boron magnet scraps obtained by extracting rare earth elements by acid solution treatment. Further, polishing powder generated in the polishing process of rare earth-iron-iron-boron sintered magnets can also be used. Since the abrasive powder is easily ignited with a powder of several ⁇ m, it is stored in water, and the abrasive powder becomes sludge. The polishing powder in this state is oxidized only on the surface layer, and carbides, oxides, and the like, which are polishing boulder components, are adhered during polishing.
- oxidation can be carried out by heating in an oxygen-containing atmosphere.
- the oxygen concentration in the oxygen-containing atmosphere is not particularly limited, and can be performed, for example, in the air or in a mixed gas of an inert gas such as argon and oxygen.
- the heating conditions can be selected as appropriate so that the alloys and hydroxides in the magnet scrap are efficiently oxidized. At this time, even if the entire scrap is oxidized, the scrap may be partially oxidized if a sufficient amount of heat can be obtained in the thermite reaction described later.
- the heating temperature is usually 200 ° C. or higher, preferably 300 to 1000 ° C.
- the heating time is usually 1 minute to 10 hours, preferably 30 minutes to 2 hours.
- the scrap is pulverized before or after the acidification in step A for the purpose of efficiently performing the acid-acid reaction in step A or the thermite reaction described later. be able to.
- the pulverization is preferably hydrogen pulverization.
- the scrap is fine powder such as abrasive powder
- the scrap is pre-packeted before or after the acidification in step A for the purpose of facilitating the charging operation into the thermite furnace described later and reducing the dust. It may be cached (in a lump).
- the recovery method of the present invention includes, as step B, a rare earth-iron-boron-based magnet scrap oxidized in step A, at least one selected from aluminum and aluminum alloy force, and an oxidant as necessary. Preparing a mixture for thermite reaction comprising
- Step B in order to adjust the composition of the recovered ferroboron, the amount of iron and boron required to produce the ferroboron having the desired composition is calculated from the amount of iron and boron in the rare earth-ferrous boron-based magnet scrap.
- the amount of boron in the scrap is excessive, at least one selected from iron and iron oxide is included in the mixture for the thermite reaction. be able to.
- the amount of boron is insufficient, at least one selected from boron and boron compounds to make up for the shortage can be included in the mixture for the thermite reaction.
- the boron compound include boric anhydride and boric acid. In practice, it is preferable that the boron outlet boron to be recovered has a boron content of 0.5 to 22% by weight.
- step B aluminum and Z or aluminum alloy act as a reducing agent in the next step, and iron in the rare earth-iron-boron magnet scrap oxidized in step A Is involved in the reaction to produce boron as ferroboron.
- the content ratio of aluminum and / or aluminum alloy in the mixture for the thermite reaction can be determined by the amount of oxide necessary for the thermite reaction and the amount of aluminum to reduce it. For example, it is determined by determining the stoichiometric amount of aluminum required to reduce the rare earth-iron-boron-based magnet scrap oxidized in step A and the iron oxide, boron compound, etc. added as necessary. can do. Specifically, aluminum and Z or aluminum alloy, which is usually 1.0 to 1.4 times as much as the stoichiometric amount of aluminum, can be contained. If the amount of aluminum is less than the stoichiometric value, the entire oxide cannot be reduced, and iron and boron may be mixed in the slag produced by the thermite reaction.
- the amount of aluminum is more than 1.4 times the stoichiometry, the amount of aluminum in the alloy produced by the thermite reaction increases, and the useful material recovered can be used as a raw material for rare earth-iron-boron-based magnet alloys. There is a risk of disappearing.
- the form is preferably a powder form, and the particle diameter is preferably 1 to 5 mm.
- the thermite reaction mixture prepared in step B may be mixed with an oxidant, if necessary, in order to ensure the amount of heat necessary for the thermite reaction in the next step.
- the amount of heat is preferably set so that the amount of heat for melting the entire raw material can be secured in consideration of the heat removed from the furnace body and, if necessary, the heat of dissolution when iron or boron is added.
- the oxidizing agent include barium peroxide, potassium chlorate, and sodium chlorate. Preferably mentioned.
- the content ratio of the oxidizing agent in the thermite reaction mixture can be determined by appropriately selecting an amount capable of securing the necessary heat amount.
- the magnet scrap is a polishing powder generated in the polishing process of a rare earth-iron-boron-based sintered magnet
- various thermit reactions have been studied, and as a result, the entire polishing powder is sufficiently oxidized in process A.
- the calorific value per kg of the thermite reaction mixture prepared in step B is less than 800kcaU, it may cause undissolved residue and a uniform alloy may not be obtained.On the other hand, if it exceeds 950kcal, the reaction will occur. When it becomes violent, spatter scattering becomes prominent, yield decreases, and damage to the furnace body may increase. Therefore, it is desirable to adjust the content ratio of the oxidizing agent so that the calorific value per kg of the thermite reaction mixture prepared in Step B is preferably 800 to 950 kcal, more preferably 890 to 910 kcal.
- the recovery method of the present invention includes, as Step C, a step of subjecting the thermite reaction mixture to a thermite reaction in order to produce ferroboron and slag.
- the mixture for the thermite reaction prepared in step B is charged into a reactor constructed with magnesia or the like. This can be done by igniting by placing an igniter mixed with barium peroxide and aluminum powder in paper at the top of the charged raw material.
- oxides of transition metals such as iron, boron and cobalt in the mixture are reduced with aluminum and melted at a high temperature to form an alloy.
- rare earth oxides that are not reduced by aluminum float up and enter the slag together with alumina.
- the carbon in the mixture becomes diacid carbon and is removed out of the system.
- calcium chloride, etc. can be put into the reactor.
- the recovery method of the present invention includes, as Step D, a step of separating the ferroboron and slag obtained in Step C.
- step D For the separation of ferroboron and slag in step D, for example, a method of mechanically crushing and separating using the difference in plastic deformability is preferable because of its high efficiency.
- the slag separated in step D is used as step E.
- the process includes separation into a lumi-um-containing material and a rare earth element-containing material.
- rare earth oxide and alumina are mixed.
- step E in order to separate the aluminum-containing material mainly composed of aluminum and the rare earth element-containing material mainly composed of rare earth elements in the slag, there is a method of separating using the specific gravity difference of the oxide. It is common. A method of extracting rare earth elements by acid solution treatment is also preferable.
- the extracted rare earth element can be recovered as a rare earth salt such as carbonate, oxalate or fluoride by a known precipitation method. Further, the rare earth salt can be oxidized to a rare earth oxide.
- the rare earth oxide can be used as a raw material for molten salt electrolysis, while alumina can be used as a raw material for abrasives.
- a thermite reduction facility with a crucible with an inner size of 250 ⁇ x 400mm constructed with a magnesia brick and lined with magnesia was prepared.
- Five types of rare earth-iron-boron sintered magnet polishing powders having the composition shown in Table 1 were prepared and oxidized in the atmosphere at 750 ° C. for 4 hours.
- the thermite reaction mixture was prepared by mixing 1.52 kg with 0.27 kg of potassium chlorate, 0.9 kg of boric anhydride, and 0.78 kg of anoleminium powder, and charged in a crucible.
- Table 3 shows the amounts of recovered rare earth oxide and alumina.
- Example 1 5.5 20.3 0.0 0.0 4.2 64.7 1.0 0.9 2.2 1.2
- Example 2 6.5 21.7 0.1 0.4 0.6 65.4 1.0 0.9 2.4
- Example 3 7.0 23.3 0.1 0.0 0.1 65.4 0.9 0.0 1.9
- Example 4 3.7 24.7 0.1 0.2 2.2 64.0 1.0 0.3 3.1 0.7
- Example 5 4.6 25.1 0.0 0.0 2.6 63.7 0.6 0.5 1.7 1.2
- Rare earth ferrous boron-based sintered magnets 5 kg of abrasive powder were mixed with 10 L of pure water to form alloy sludge. While sending 3 LZ of air into this solution, 5N nitric acid solution was added at a rate of 30 mlZ, and the addition and stirring of the nitric acid solution were adjusted so that the liquid temperature did not exceed 50 ° C. The resulting solution was filtered and washed to obtain a precipitate. The precipitate was hydroxide and ferric iron. The precipitate was oxidized in the atmosphere at 750 ° C for 4 hours. The resulting oxide is R O (rare earth acid
- the composition was 1 wt%, CuO was 0.11 wt%, and SiO was 0.10 wt%.
- a mixture for the thermite reaction was prepared by mixing this acid salt with the amount of aluminum powder, potassium chlorate and boric acid shown in Table 4.
- the obtained mixture was subjected to thermite reaction in the same manner as in Examples 1 to 5 to obtain a product, and the product was crushed to recover the alloy and slag.
- Table 5 shows the chemical composition of the obtained alloy.
- the slag is then crushed, and rare earth oxides and alumina are recovered by specific gravity separation. It was. Table 6 shows the amounts of recovered rare earth oxide and alumina.
- Table 9 shows the amounts of recovered rare earth oxides and alumina.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Hard Magnetic Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008511018A JP5149164B2 (ja) | 2006-04-17 | 2007-04-16 | 希土類−鉄−ボロン系磁石スクラップからの有用材料回収方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-113462 | 2006-04-17 | ||
JP2006113462 | 2006-04-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007119846A1 true WO2007119846A1 (ja) | 2007-10-25 |
Family
ID=38609605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/058249 WO2007119846A1 (ja) | 2006-04-17 | 2007-04-16 | 希土類-鉄-ボロン系磁石スクラップからの有用材料回収方法 |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP5149164B2 (ja) |
CN (1) | CN101466854A (ja) |
MY (1) | MY144466A (ja) |
WO (1) | WO2007119846A1 (ja) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102011020A (zh) * | 2009-12-14 | 2011-04-13 | 包头市玺骏稀土有限责任公司 | 从钕铁硼废料中回收稀土元素的方法 |
WO2012121353A1 (ja) * | 2011-03-10 | 2012-09-13 | 株式会社日立製作所 | 希土類磁石からの希土類金属回収装置および希土類金属回収方法 |
JP2013204095A (ja) * | 2012-03-28 | 2013-10-07 | Hitachi Metals Ltd | 希土類元素の回収方法 |
JP5327409B2 (ja) * | 2011-07-29 | 2013-10-30 | 日立金属株式会社 | 希土類元素の回収方法 |
WO2014064597A2 (fr) | 2012-10-24 | 2014-05-01 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Procede pour isoler les terres rares et/ou element(s) metallique(s) annexe(s) contenus dans la phase magnetique d'aimants permanents |
JP2014169497A (ja) * | 2012-11-28 | 2014-09-18 | Hitachi Metals Ltd | 希土類元素の回収方法 |
JP2017179414A (ja) * | 2016-03-28 | 2017-10-05 | 日立金属株式会社 | 軽希土類元素と重希土類元素を含む処理対象物から重希土類元素を溶出させる方法 |
WO2017207947A1 (fr) | 2016-06-03 | 2017-12-07 | Brgm | Procédé d'extraction de terres rares contenues dans des aimants permanents |
CN108359798A (zh) * | 2017-06-03 | 2018-08-03 | 江西离子型稀土工程技术研究有限公司 | 一种快速高效回收利用钕铁硼废料的方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61157646A (ja) * | 1984-12-29 | 1986-07-17 | Showa Denko Kk | 希土類合金の製造方法 |
JPH05132321A (ja) * | 1990-07-17 | 1993-05-28 | Univ Iowa Res Found | 希土類/鉄弗化物並びにそれを製造しそして使用する方法 |
-
2007
- 2007-04-16 MY MYPI20084105 patent/MY144466A/en unknown
- 2007-04-16 CN CNA2007800215675A patent/CN101466854A/zh active Pending
- 2007-04-16 WO PCT/JP2007/058249 patent/WO2007119846A1/ja active Application Filing
- 2007-04-16 JP JP2008511018A patent/JP5149164B2/ja active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61157646A (ja) * | 1984-12-29 | 1986-07-17 | Showa Denko Kk | 希土類合金の製造方法 |
JPH05132321A (ja) * | 1990-07-17 | 1993-05-28 | Univ Iowa Res Found | 希土類/鉄弗化物並びにそれを製造しそして使用する方法 |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102011020A (zh) * | 2009-12-14 | 2011-04-13 | 包头市玺骏稀土有限责任公司 | 从钕铁硼废料中回收稀土元素的方法 |
WO2012121353A1 (ja) * | 2011-03-10 | 2012-09-13 | 株式会社日立製作所 | 希土類磁石からの希土類金属回収装置および希土類金属回収方法 |
JP5327409B2 (ja) * | 2011-07-29 | 2013-10-30 | 日立金属株式会社 | 希土類元素の回収方法 |
EP2738270A1 (en) | 2011-07-29 | 2014-06-04 | Hitachi Metals, Ltd. | Method for recovering rare earth element |
EP2738270B1 (en) * | 2011-07-29 | 2020-01-22 | Hitachi Metals, Ltd. | Method for recovering rare earth element |
JP2013204095A (ja) * | 2012-03-28 | 2013-10-07 | Hitachi Metals Ltd | 希土類元素の回収方法 |
US10167532B2 (en) | 2012-10-24 | 2019-01-01 | Commissariat à l'Energie Atomique et aux Energies Alternatives | Method for isolating rare earths and/or adjacent metal element(s) contained in the magnetic phase of permanent magnets |
WO2014064597A2 (fr) | 2012-10-24 | 2014-05-01 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Procede pour isoler les terres rares et/ou element(s) metallique(s) annexe(s) contenus dans la phase magnetique d'aimants permanents |
JP2014169497A (ja) * | 2012-11-28 | 2014-09-18 | Hitachi Metals Ltd | 希土類元素の回収方法 |
JP2017179414A (ja) * | 2016-03-28 | 2017-10-05 | 日立金属株式会社 | 軽希土類元素と重希土類元素を含む処理対象物から重希土類元素を溶出させる方法 |
WO2017207947A1 (fr) | 2016-06-03 | 2017-12-07 | Brgm | Procédé d'extraction de terres rares contenues dans des aimants permanents |
US11155898B2 (en) | 2016-06-03 | 2021-10-26 | Brgm | Method for extracting rare earth elements contained in permanent magnets |
CN108359798A (zh) * | 2017-06-03 | 2018-08-03 | 江西离子型稀土工程技术研究有限公司 | 一种快速高效回收利用钕铁硼废料的方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101466854A (zh) | 2009-06-24 |
JP5149164B2 (ja) | 2013-02-20 |
MY144466A (en) | 2011-09-30 |
JPWO2007119846A1 (ja) | 2009-08-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5149164B2 (ja) | 希土類−鉄−ボロン系磁石スクラップからの有用材料回収方法 | |
Kumari et al. | Recovery of rare earths from spent NdFeB magnets of wind turbine: Leaching and kinetic aspects | |
Yang et al. | REE recovery from end-of-life NdFeB permanent magnet scrap: a critical review | |
US10648063B2 (en) | Dissolution and separation of rare earth metals | |
CN102388154A (zh) | 回收贵金属的等离子体方法和设备 | |
JP6233321B2 (ja) | 重希土類元素の回収方法 | |
CN102978401A (zh) | 回收钕铁硼和钐钴磁性材料废料中稀土和其它金属方法 | |
JP5767993B2 (ja) | 希土類元素含有物質からの希土類元素濃縮方法 | |
JP2009030121A (ja) | 電気炉ダストからの酸化亜鉛の回収方法 | |
JP2003051418A (ja) | 希土類磁石スクラップの再生方法 | |
JP4932309B2 (ja) | 含クロムスラグからのクロム回収方法 | |
WO2022091801A1 (ja) | 重希土類元素のリサイクル方法及び希土類磁石のリサイクル方法 | |
Bian et al. | Recovery of rare earth elements from NdFeB magnet scraps by pyrometallurgical processes | |
Kaya | An overview of NdFeB magnets recycling technologies | |
JP5905782B2 (ja) | 希土類元素含有物質からの希土類元素濃縮方法 | |
JP3450447B2 (ja) | 希土類磁石スクラップの溶解方法 | |
JP2016108632A (ja) | 希土類元素の分離回収方法 | |
KR101874202B1 (ko) | 알루미늄 잉곳의 제조 방법 | |
JP2002012921A (ja) | 希土類磁石スクラップの再生方法 | |
JPS61153201A (ja) | 希土類磁石のスクラツプ再生方法 | |
JP2005057191A (ja) | 希土類磁石粉末の製造方法 | |
CN105316561A (zh) | 一种使用稀土永磁材料废料制备钢铁添加剂的方法 | |
JP2014181370A (ja) | 希土類元素の回収方法及び鉄鋼成分の再利用方法 | |
WO2012173522A1 (ru) | Способ селективного извлечения металлов из комплексных руд | |
WO2024048249A1 (ja) | 有価金属の回収方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200780021567.5 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07741685 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2008511018 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12008502326 Country of ref document: PH |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 07741685 Country of ref document: EP Kind code of ref document: A1 |