CN103721818A - Method used for reducing temperature of grinding chamber of fluidization air-stream mill - Google Patents
Method used for reducing temperature of grinding chamber of fluidization air-stream mill Download PDFInfo
- Publication number
- CN103721818A CN103721818A CN201210386966.4A CN201210386966A CN103721818A CN 103721818 A CN103721818 A CN 103721818A CN 201210386966 A CN201210386966 A CN 201210386966A CN 103721818 A CN103721818 A CN 103721818A
- Authority
- CN
- China
- Prior art keywords
- grinding chamber
- compressed gas
- temperature
- method used
- stream mill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The invention discloses a method used for reducing temperature of a grinding chamber of a fluidization air-stream mill. According to the method, in a air-stream mill, a cooling device is arranged between a gas compressor and the grinding chamber via series connection so as to keep the temperature of compressed gas in the grinding chamber at 5 to 10 DEG C, and increase powder yield. The method can be used for processing of neodymium iron boron permanent magnet material.
Description
Technical field
The present invention relates to granular materials manufacture field, particularly a kind of method that reduces fluidisation air-flow mill grinding room temperature.
Background technology
At present, the method that known reduction fluidisation air-flow mill grinds room temperature is through the cooling grinding chamber that enters again afterwards of aftercooler by Compressed Gas, but, aftercooler is undertaken cooling by cooling circulating water, and the temperature of cooling circulating water is subject to season, the impact of the factors such as weather changes, this kind of cooled temperature of method Compressed Gas is not at 20 ℃-40 ℃ etc., higher temperature has reduced the fragility of granular materials (particularly Nd-Fe-B permanent magnet material), in order to reach the granularity requirements of regulation, must increase broken number of times, broken number of times is more, tell material (, the superfine powder of granularity < 2.7 μ m) ratio is also higher, waste is more.
Summary of the invention
In order to overcome above-mentioned deficiency, the invention provides a kind of method that fluidisation air-flow mill grinds room temperature that reduces, wherein, in airflow milling unit, it is 5 ℃-10 ℃ that the cooling device of connecting between gas compressor and grinding chamber makes Compressed Gas temperature in grinding chamber, preferably 6 ℃-8 ℃.
Wherein said cooling device is freeze drier or cooler.
Wherein said Compressed Gas is inert gas, is preferably nitrogen.
Wherein grinding chamber diameter is 260-400mm.
Wherein the pressure of Compressed Gas is: 0.62-0.78MPa, and while being preferably grinding chamber diameter 260-300mm, pressure is 0.62-0.68MPa, when grinding chamber diameter is 310-400mm, pressure is 0.72-0.78MPa.
The method that reduction fluidisation air-flow mill of the present invention grinds room temperature is specially adapted to the processing of Nd-Fe-B permanent magnet material.
The specific embodiment
In embodiment 1, temperature control and not two kinds of situations of temperature control, tell the difference of material ratio.
1. from production line, choose slightly broken powder of three tank Nd-Fe-B permanent magnet materials.
2. broken rear batch mixing 4 hours in each tank powder, is then divided into two and half tanks.
3. one of them half tank of same tank powder is roughly ground at No. 1 equipment (temperature of controlling compressed nitrogen in grinding chamber is 5 ℃-10 ℃), No. 14 equipment (temperature control) refine, another half tank is being roughly ground at No. 1 equipment (not controlling Compressed Gas temperature), and No. 14 equipment (not temperature control) refine.
4. in two kinds of temperature control situations of test, tell the difference of material ratio.
Embodiment 1 explanation, same composition, identical device control in grinding chamber Compressed Gas temperature be 5 ℃ of-10 ℃ of ratios not temperature control to tell material ratio low.
At embodiment 2, different Compressed Gas temperature, tell the difference of material ratio
1. from production line, choose slightly broken powder of three tank Nd-Fe-B permanent magnets.
2. broken rear batch mixing 4 hours in each tank powder, is then divided into four and half tanks, cooling driers temperature is made as to 0 ℃, 6 ℃, 8 ℃ and 15 ℃ successively and roughly grinds and refine on same equipment.
3. test different temperatures is told the difference of material ratio under controlling.
Embodiment 2 explanation, same composition, identical device cooling driers control in grinding chamber that when Compressed Gas temperature is 6-8 ℃, to tell material ratio minimum.
Applicant finds, when grinding chamber diameter 260-300mm and compression pressure are 0.62-0.68MPa, or grinding chamber diameter is that in 310-400mm, the pressure situation that is 0.72-0.78MPa, the size distribution curve of the Nd-Fe-Bo permanent magnet material obtaining according to the inventive method is best.
Claims (9)
1. reduce the method that fluidisation air-flow mill grinds room temperature, wherein, in airflow milling unit, it is 5 ℃-10 ℃ that the cooling device of connecting between gas compressor and grinding chamber makes the temperature of Compressed Gas in grinding chamber.
2. the method for claim 1, the temperature of wherein said Compressed Gas is 6 ℃-8 ℃.
3. method as claimed in claim 1 or 2, wherein said cooling device is freeze drier or cooler.
4. method as claimed in claim 1 or 2, wherein said Compressed Gas is inert gas.
5. method as claimed in claim 4, wherein said Compressed Gas is nitrogen.
6. the method for claim 1, wherein grinding chamber diameter is 260-400mm.
7. the method for claim 1, wherein the pressure of Compressed Gas is 0.62-0.78MPa.
8. method as claimed in claim 7, wherein when grinding chamber diameter 260-300mm, the pressure of Compressed Gas is 0.62-0.68MPa, when grinding chamber diameter is 310-400mm, the pressure of Compressed Gas is 0.72-0.78MPa.
9. a processing method for Nd-Fe-B permanent magnet material, is wherein used the method for grinding room temperature as the reduction fluidisation air-flow mill as described in arbitrary in claim 1-8 to carry out the processing of Nd-Fe-B permanent magnet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210386966.4A CN103721818B (en) | 2012-10-11 | 2012-10-11 | A kind of method reducing fluidisation air-flow mill grinding room temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210386966.4A CN103721818B (en) | 2012-10-11 | 2012-10-11 | A kind of method reducing fluidisation air-flow mill grinding room temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103721818A true CN103721818A (en) | 2014-04-16 |
| CN103721818B CN103721818B (en) | 2015-12-02 |
Family
ID=50446255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210386966.4A Active CN103721818B (en) | 2012-10-11 | 2012-10-11 | A kind of method reducing fluidisation air-flow mill grinding room temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103721818B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4602743A (en) * | 1983-10-20 | 1986-07-29 | Alpine Aktiengesellschaft | Fluidized bed jet mill |
| CN2558457Y (en) * | 2002-07-16 | 2003-07-02 | 董中天 | Air-current powder mill for powdering Nd-Fe-B permanent-magnet material |
| CN1443606A (en) * | 2003-04-18 | 2003-09-24 | 宁波韵升（集团）股份有限公司 | Preumatic mill |
| CN102021471A (en) * | 2009-09-17 | 2011-04-20 | 中国科学院宁波材料技术与工程研究所 | Preparation method for neodymium iron boron permanent magnet material |
| CN102728841A (en) * | 2012-07-10 | 2012-10-17 | 交城县融和磁材有限公司 | Airflow powder grinding device and method for sintered neodymium iron boron (NdFeB) permanent magnet material |
-
2012
- 2012-10-11 CN CN201210386966.4A patent/CN103721818B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4602743A (en) * | 1983-10-20 | 1986-07-29 | Alpine Aktiengesellschaft | Fluidized bed jet mill |
| CN2558457Y (en) * | 2002-07-16 | 2003-07-02 | 董中天 | Air-current powder mill for powdering Nd-Fe-B permanent-magnet material |
| CN1443606A (en) * | 2003-04-18 | 2003-09-24 | 宁波韵升（集团）股份有限公司 | Preumatic mill |
| CN102021471A (en) * | 2009-09-17 | 2011-04-20 | 中国科学院宁波材料技术与工程研究所 | Preparation method for neodymium iron boron permanent magnet material |
| CN102728841A (en) * | 2012-07-10 | 2012-10-17 | 交城县融和磁材有限公司 | Airflow powder grinding device and method for sintered neodymium iron boron (NdFeB) permanent magnet material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103721818B (en) | 2015-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103137281B (en) | Bonding La (Fe, Si)13Base magnetothermal effect material and its production and use | |
| CN104261811B (en) | A kind of high-performance permanent-magnet ferrite and manufacture method thereof | |
| CN104876563B (en) | A kind of ferrite NULL | |
| CN102617118B (en) | Method for preparing high-purity tabular corundum with low energy consumption | |
| TWI636016B (en) | Methods of fabricating modified iron oxide powder and fabricating ferrite magnet | |
| CN102728841B (en) | Airflow powder grinding device and method for sintered neodymium iron boron (NdFeB) permanent magnet material | |
| CN108395220A (en) | A kind of preparation method of the wear-resisting diphase ceramic material of aluminium oxide-zirconium oxide | |
| CN107316727A (en) | A kind of sintered NdFeB preparation method | |
| CN110372403A (en) | A kind of preparation method using phosphorus tailing preparation hydration-resisting type magnesite-dolomite refractories | |
| CN102352241A (en) | High-strength ceramic proppant and preparation method thereof | |
| CN105060863A (en) | Formulation and technology of medium-high-alumina ceramic balls | |
| CN102360909A (en) | Preparation method for neodymium iron boron magnet | |
| CN113223802B (en) | High-temperature-resistant neodymium-iron-boron magnet and preparation method thereof | |
| CN103721818A (en) | Method used for reducing temperature of grinding chamber of fluidization air-stream mill | |
| CN106783123A (en) | The low-temperature melt producing method of NdFeB material | |
| CN102031063B (en) | Rare earth polishing powder and production method thereof | |
| Dong et al. | Design and large magnetostriction of Tb0. 34Dy0. 56Pr0. 1Fe1. 9/epoxy composite containing near-spherical single-crystal particles | |
| KR20170062504A (en) | Ferrite powder for bonded magnet, production method therefor, and ferrite bonded magnet | |
| CN106116532B (en) | A kind of preparation method of antiwear alumina ceramic ball | |
| CN107573055A (en) | The processing method of magneto magnetic material | |
| CN102021471A (en) | Preparation method for neodymium iron boron permanent magnet material | |
| TWI686356B (en) | Method of fabricating modified ferrite magnetic powder and ferrite magnet | |
| CN102674418A (en) | Method for preparing high-purity alumina particles | |
| CN107651954A (en) | The processing method of permanent ferrite prefiring material | |
| CN110937888A (en) | High-performance permanent magnetic ferrite material with secondary pre-sintering of powder and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A Method for Reducing the Temperature of the Grinding Chamber of Fluidized Air Flow Mill Effective date of registration: 20230717 Granted publication date: 20151202 Pledgee: China CITIC Bank Co.,Ltd. Taiyuan Branch Pledgor: SINO MAGNETICS TECHNOLOGY Co.,Ltd. Registration number: Y2023140000039 |