CN1060700C - Method for low-temp. crushing of rare-earth permanent-magnet alloy ingot - Google Patents
Method for low-temp. crushing of rare-earth permanent-magnet alloy ingot Download PDFInfo
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- CN1060700C CN1060700C CN96117303A CN96117303A CN1060700C CN 1060700 C CN1060700 C CN 1060700C CN 96117303 A CN96117303 A CN 96117303A CN 96117303 A CN96117303 A CN 96117303A CN 1060700 C CN1060700 C CN 1060700C
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- earth permanent
- alloy ingot
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Abstract
The present invention relates to a method for low-temperature crushing of a rare-earth permanent-magnet alloy ingot, which comprises the steps: firstly, a crushed rare-earth permanent-magnet alloy ingot and inert refrigerant are mixed in a container; then, the mixture of the crushed rare-earth permanent-magnet alloy ingot and the inert refrigerant is impacted or cut; finally, powdered finished products are collected, wherein the temperature of a region for impacting or cutting the mixture in the container is controlled under-60 DEG C, and the weight ratio of the inert refrigerant and the crushed rare-earth permanent-magnet alloy ingot is greater than 1: 5. The fine powder oxidation in the crushing process of the crushed rare-earth permanent-magnet alloy ingot is stopped by the present invention, and crushing ratio and crushing efficiency are greatly improved.
Description
A kind of method of cryogenic pulverization rare-earth permanent-magnet alloy ingot relates to the breaking method that utilizes physical effect.
At present, produce in the process of rare earth permanent-magnetic material the broken mechanical crushing method that adopts usually of rare-earth permanent-magnet alloy ingot both at home and abroad.Generally the alloy pig about 100mm is crushed to and needs to divide 4 fragmentations about 1mm.As everyone knows, produce high performance rare-earth permanent magnet, hypoxemia even anaerobic technology are extremely essential in the production process, and the inert gas shielding in broken stage also is extremely important to the oxygen content that reduces finished product.And above-mentioned mechanical crushing method, will effectively reduce broken thing in process of production is unusual difficulty with the contact of air, thereby has caused the oxidation of powder, has influenced the performance of final products.
The method that the purpose of this invention is to provide a kind of cryogenic pulverization rare-earth permanent-magnet alloy ingot adopts this method can effectively reduce the oxygen content of rare-earth permanent magnet.
The present invention adopts such technical scheme according to above-mentioned purpose: at first the rare-earth permanent-magnet alloy ingot that will be broken mixes in container with inert cryogen, then mixture is impacted or cuts, and collects the powdered finished product at last; Wherein, in the container mixture is impacted or the temperature of cutting zone is controlled at below-60 ℃, inert cryogen with to be broken rare earth permanent magnet ingot weight ratio greater than 1: 5.
Because the present invention has adopted inert cryogen, thereby has stopped fine powder oxidation in the rare-earth permanent-magnet alloy ingot shattering process substantially, simultaneously, adopt the deep cooling fragmentation greatly to improve the ratio of reduction, the ratio of reduction is reached more than 50, and simplified crushing process.
Particular content of the present invention is provided by following embodiment and accompanying drawing.
Accompanying drawing is the method equipment therefor schematic diagram according to the cryogenic pulverization rare-earth permanent-magnet alloy ingot of the present invention's proposition
Below in conjunction with drawings and Examples foundation cryogenic pulverization rare-earth permanent-magnet alloy ingot of the present invention is further described.
The size of rare-earth permanent-magnet alloy ingot generally about 100mm, is mixed this rare-earth permanent-magnet alloy ingot with inert cryogen in container mutually, and mixture is impacted or cuts.In the present embodiment, impact or the cutting to mixture is to realize by the form that stirs.As shown in drawings, jar is gone into inert cryogen 1 and rare-earth permanent-magnet alloy ingot 4 in container 7.Stir by stirring vane 3, stirring vane is then driven by motor 2.Also can cause the bump each other of rare-earth permanent-magnet alloy ingot by the convection current of cold-producing medium.For improving broken efficient, preferably rare-earth permanent-magnet alloy ingot is carried out machinery and slightly break, the rare-earth permanent-magnet alloy ingot that is about to about 100mm is crushed to about 25mm.Before being carried out fragmentation, rare-earth permanent-magnet alloy ingot preferably can in container 5, carry out precooling.
Inert cryogen is controlled in the temperature of fracture area 6-below 60 ℃, is preferably in below-190 ℃ with the mixture of the rare-earth permanent-magnet alloy ingot that will be broken.Inert cryogen is preferably selected liquid nitrogen for use, and at this moment, the fracture area Controllable Temperature is built in about-196 ℃.Also can select other inert cryogen for use, as inert gas argon, radon or other liquid organic or inorganic inert gases of liquid state.Inert cryogen should be so that mixture reaches cryogenic is principle with the blending ratio of the rare-earth permanent-magnet alloy ingot that will be broken, the temperature that is the mixed zone is lower than-60 ℃, general inert cryogen with to be broken the rare-earth permanent-magnet alloy ingot weight ratio greater than 1: 5, preferable ratio is 4: 5.
Be deposited on the bottom of container after the rare-earth permanent-magnet alloy ingot fragmentation, preferably slightly heat the bottom of container reach normal temperature this moment, so that the liquid refrigerant gasification, thereby isolate the powdered finished product, open drain valve 8, can collect the powdered finished product.
Claims (5)
1. the method for a cryogenic pulverization rare-earth permanent-magnet alloy ingot is characterized in that the rare-earth permanent-magnet alloy ingot that at first will be broken mixes in container with inert cryogen, then mixture is impacted or cuts, and collects the powdered finished product at last; And, in the container mixture is impacted or the temperature of cutting zone is controlled at below-60 ℃, inert cryogen with to be broken the rare-earth permanent-magnet alloy ingot weight ratio greater than 1: 5.
2. the method for cryogenic pulverization rare-earth permanent-magnet alloy ingot as claimed in claim 1 is characterized in that inert cryogen is a liquid nitrogen.
3. the method for cryogenic pulverization rare-earth permanent-magnet alloy ingot as claimed in claim 1 is characterized in that mixture is impacted or the temperature of cutting zone is controlled at below-190 ℃.
4. the method for cryogenic pulverization rare-earth permanent-magnet alloy ingot as claimed in claim 1 is characterized in that the inert cryogen and the rare-earth permanent-magnet alloy ingot weight ratio that will be broken are 4: 5.
5. the method for cryogenic pulverization rare-earth permanent-magnet alloy ingot as claimed in claim 1 is characterized in that rare-earth permanent-magnet alloy ingot is carried out precooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117303A CN1060700C (en) | 1996-11-26 | 1996-11-26 | Method for low-temp. crushing of rare-earth permanent-magnet alloy ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117303A CN1060700C (en) | 1996-11-26 | 1996-11-26 | Method for low-temp. crushing of rare-earth permanent-magnet alloy ingot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1183330A CN1183330A (en) | 1998-06-03 |
| CN1060700C true CN1060700C (en) | 2001-01-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96117303A Expired - Fee Related CN1060700C (en) | 1996-11-26 | 1996-11-26 | Method for low-temp. crushing of rare-earth permanent-magnet alloy ingot |
Country Status (1)
| Country | Link |
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| CN (1) | CN1060700C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805877B (en) * | 2010-03-27 | 2011-08-03 | 陈德华 | Cryogenic refrigeration technology of magnets for electroplating |
| CN109967748B (en) * | 2017-12-27 | 2022-11-04 | 宁波科宁达工业有限公司 | Method for manufacturing rare earth permanent magnet alloy powder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073384A (en) * | 1991-12-10 | 1993-06-23 | 三菱麻铁里亚尔株式会社 | Produce the method for rare earth alloy magnet powder |
| CN1075669A (en) * | 1993-03-01 | 1993-09-01 | 冶金工业部钢铁研究总院 | The preparation method of rare earth permanent-magnet powder |
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1996
- 1996-11-26 CN CN96117303A patent/CN1060700C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073384A (en) * | 1991-12-10 | 1993-06-23 | 三菱麻铁里亚尔株式会社 | Produce the method for rare earth alloy magnet powder |
| CN1075669A (en) * | 1993-03-01 | 1993-09-01 | 冶金工业部钢铁研究总院 | The preparation method of rare earth permanent-magnet powder |
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| Publication number | Publication date |
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| CN1183330A (en) | 1998-06-03 |
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