CN102070165A - High temperature production process of alpha-aluminum oxide - Google Patents
High temperature production process of alpha-aluminum oxide Download PDFInfo
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- CN102070165A CN102070165A CN2010105760883A CN201010576088A CN102070165A CN 102070165 A CN102070165 A CN 102070165A CN 2010105760883 A CN2010105760883 A CN 2010105760883A CN 201010576088 A CN201010576088 A CN 201010576088A CN 102070165 A CN102070165 A CN 102070165A
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- aluminum oxide
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- alumina
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Abstract
The invention discloses a high temperature production process of alpha-aluminum oxide, belongs to the production field of refractory material and aims to solve the problems that in the preparation of industrial alpha-aluminum oxide that the cost is high and energy is not saved. The process comprises the following production steps: grinding aluminum oxide, sending the grinded aluminum oxide to a ball forming mill to roll and prepare pellets, and placing the dried pellets in a shaft kiln to prepare alpha-aluminum oxide. By utilizing the process to prepare alpha-aluminum oxide, energy can be reduced by more than 50% and the yield can be increased by more than five times. The production process of the invention uses the ultrahigh temperature shaft kiln for calcination, thus the product purity is higher than that adopting the relatively traditional process; and by adopting the process, human input can be effectively saved.
Description
Technical field
The invention belongs to the refractory materials production field, especially a kind of processing method of high temperature production Alpha-alumina.
Background technology
Alpha-alumina, crystal formation are the α type.Its thermotolerance is strong, good moldability, crystalline phase is stable, hardness is high, dimensional stability good, the strengthening and toughening that can be widely used in products such as various plastics, rubber, pottery, refractory materials, the wear resisting property that particularly improves ceramic compactness, smooth finish, cold and hot fatigability, fracture toughness property, creep-resistant property and macromolecular material product is particularly remarkable.
At present, the industrial method for preparing Alpha-alumina mainly is to be packed in one by one the saggar by aluminum oxide powder, push in tunnel furnace, pushed bat kiln, shuttle kiln or the down-draft kiln step then to fire and form, but there are the following problems for this technology:
1, because used saggar space is less, and stowage capacity is limited, and about 0.2 ton aluminium powder can only be loaded in every cubic metre of space, and saggar itself also occupies the more space of firing, thereby it is very difficult further to improve output in limited kiln body space.
2, saggar chilling and shock heating in producing sintering procedure very easily damages, and not only increases the cost of changing saggar, and is easy to generate " kiln collapses ", causes stopping production the normal operation that influence is produced.
3, because being loaded into, aluminum oxide powder enters high-temperature firing in the kiln in the saggar, need discharging after firing and reload virgin material, this process workload is big, labour intensity is high, the saggar temperature is reduced to low temperature by high temperature, when firing, the aluminum oxide of packing into once more aluminium powder also need heat saggar once more, phenomenon is serious " to eat fire ", and it is more to consume energy.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the invention provides a kind of processing method of high temperature production Alpha-alumina, this processing method can effectively solve cost height and problem of energy saving in the industrial Alpha-alumina preparation.
The technical scheme that technical solution problem of the present invention is taked is: a kind of processing method of high temperature production Alpha-alumina, production stage comprises: aluminum oxide is levigate, send into the pellet that nodulizer is rolled onto after pellet, the oven dry and put into shaft furnace and calcine, make Alpha-alumina.
Detailed step comprises:
1) at first choose aluminum oxide more than 98%, with ball mill or other grinding machine with aluminum oxide levigate be the 80-400 order;
2) be that the water of alumina weight 10-40% mixes with the aluminum oxide powder after levigate and weight, send into nodulizer and be rolled onto the pellet that diameter is 10-60mm;
3) pellet is ventilated be dried, the pellet water content is reduced to below 0.3%;
4) pellet after will drying is put into shaft furnace and is calcined, and calcining temperature is controlled at more than 1300 ℃, and calcination time is 1-6h;
5) after calcining finishes, the cooling of in shaft furnace, ventilating, can be in shaft furnace discharge port upper end 1.5 meters blast inlet place ventilate, when temperature is reduced to below 75 ℃, kiln discharge;
6) with crusher with material ball crushing, with ball mill or other grinding machine that it is levigate, sieve out the Alpha-alumina of different meshes.
Used ball mill is selected conical ball mill or enamel ball mill for use in above-mentioned steps (1) and the step (6), and the ball mill barrel rotating speed is 10-40r/min.Nodulizer used in the step (2) adopts dribbling balling machine, and the rotating speed of dribbling balling machine is 12-20r/min, and the dish inclination angle is 35-45 °, and inlet amount is 8-10t/h.
The invention has the beneficial effects as follows: the present invention with respect to traditional technology, has tangible energy-saving and production-increase advantage by aluminum oxide powder rolling balling-up is calcined, and shows
1, do not use saggar, avoided saggar in sintering procedure, to damage, reduced cost, and avoid taking place because of the phenomenon that generation " kiln collapses " causes stopping production.
2, do not use saggar, saved the space of firing that saggar itself occupies, the raw material loadings obviously improves, further improve output.
3, do not use saggar, avoided the saggar phenomenon of " eating fire ", power consumption obviously reduces.
Test shows: utilize the prepared Alpha-alumina of the present invention can be energy-conservation more than 50%, volume increase be more than 5 times, and the present invention adopts the shaft furnace of ultrahigh-temperature to calcine, and traditional technology makes product purity higher relatively, utilizes this method also can effectively save human input.
Embodiment
Embodiment one:
1) at first choose aluminum oxide more than 98%, with ball mill or other grinding machine with aluminum oxide levigate be that ball mill is selected conical ball mill for use more than 80 orders, the ball mill barrel rotating speed is 35r/min;
2) be that the water of alumina weight 10% mixes with the aluminum oxide powder after levigate and weight, send into nodulizer and be rolled onto the pellet that diameter is 10mm, it is the dribbling balling machine of QP25 that nodulizer adopts model, the rotating speed of dribbling balling machine is 12r/min, the dish inclination angle is 35-45 °, and inlet amount is 8-10t/h.
3) pellet is ventilated be dried, the pellet water content is reduced to below 0.3%, also can utilize shaft furnace tail gas that it is dried;
4) dried pellet is put into shaft furnace and calcine, calcining temperature is controlled at 1600 ℃, and calcination time is 1-6h;
5) after calcining finishes, the cooling of in shaft furnace, ventilating, 1.5 meters blast inlet place ventilates in shaft furnace discharge port upper end, when treating that temperature is reduced to below 75 ℃, kiln discharge;
6) with crusher with material ball crushing, with ball mill or other grinding machine that it is levigate, sieve out the Alpha-alumina of different meshes, ball mill can be selected conical ball mill for use, the ball mill barrel rotating speed is 40r/min.
Embodiment two:
1) at first choose aluminum oxide more than 98%, with ball mill or other grinding machine with aluminum oxide levigate be 400 orders, ball mill is selected the enamel ball mill for use, the ball mill barrel rotating speed is 35r/min;
2) be that the water of alumina weight 25% mixes with the aluminum oxide powder after levigate and weight, send into that nodulizer is molten makes the pellet that diameter is 60mm, nodulizer adopts dribbling balling machine, and the rotating speed of dribbling balling machine is 20r/min, the dish inclination angle is 35-45 °, and inlet amount is 8-10t/h.
3) pellet is ventilated be dried, the pellet water content is reduced to below 0.3%, also can utilize shaft furnace tail gas that it is dried;
4) dried pellet is put into shaft furnace and calcine, calcining temperature is controlled at 1800 ℃, and calcination time is 1-6h;
5) after calcining finishes, the cooling of in shaft furnace, ventilating, 1.5 meters blast inlet place ventilates in shaft furnace discharge port upper end, when treating that temperature is reduced to below 75 ℃, kiln discharge;
6) with crusher with material ball crushing, with ball mill or other grinding machine that it is levigate, sieve out the Alpha-alumina of different meshes, ball mill can be selected the enamel ball mill for use, the ball mill barrel rotating speed is 40r/min.
Embodiment three:
1) at first choose aluminum oxide more than 98%, with ball mill or other grinding machine with aluminum oxide levigate be 300 orders, ball mill is selected conical ball mill for use, the ball mill barrel rotating speed is 38r/min;
2) be that the water of alumina weight 10-40% mixes with the aluminum oxide powder after levigate and weight, send into that nodulizer is molten makes the pellet that diameter is 50mm, nodulizer adopts dribbling balling machine, and the rotating speed of dribbling balling machine is 20r/min, the dish inclination angle is 35-45 °, and inlet amount is 8-10t/h.
3) pellet is ventilated be dried, the pellet water content is reduced to below 0.3%, also can utilize shaft furnace tail gas that it is dried;
4) dried pellet is put into shaft furnace and calcine, calcining temperature is controlled at more than 1300 ℃, and calcination time is 1-4h;
5) after calcining finishes, the cooling of in shaft furnace, ventilating, 1.5 meters blast inlet place ventilates in shaft furnace discharge port upper end, when treating that temperature is reduced to below 75 ℃, kiln discharge;
6) with crusher with material ball crushing, with ball mill or other grinding machine that it is levigate, sieve out the Alpha-alumina of different meshes, ball mill can be selected the enamel ball mill for use, the ball mill barrel rotating speed is 15r/min.
Claims (4)
1. the processing method of a high temperature production Alpha-alumina is characterized in that, production stage comprises: aluminum oxide is levigate, and send into the pellet that nodulizer is rolled onto after pellet, the oven dry and put into shaft furnace and calcine, make Alpha-alumina.
2. the processing method of high temperature production Alpha-alumina according to claim 1 is characterized in that, production stage comprises:
1) at first choose aluminum oxide more than 98%, with ball mill or other grinding machine with aluminum oxide levigate be the 80-400 order;
2) be that the water of alumina weight 10-40% mixes with the aluminum oxide powder after levigate and weight, send into nodulizer and be rolled onto the pellet that diameter is 10-60mm;
3) pellet is ventilated be dried, the pellet water content is reduced to below 0.3%;
4) pellet after will drying is put into shaft furnace and is calcined, and calcining temperature is controlled at more than 1300 ℃, and calcination time is 1-6h;
5) after calcining finishes, the cooling of in shaft furnace, ventilating, can be in shaft furnace discharge port upper end 1.5 meters blast inlet place ventilate, when temperature is reduced to below 75 ℃, kiln discharge;
6) with crusher with material ball crushing, with ball mill or other grinding machine that it is levigate, sieve out the Alpha-alumina of different meshes.
3. the processing method of high temperature production Alpha-alumina according to claim 2 is characterized in that, used ball mill is selected conical ball mill or enamel ball mill for use in step (1) and the step (6), and the ball mill barrel rotating speed is 10-40r/min.
4. the processing method of high temperature production Alpha-alumina according to claim 2 is characterized in that, nodulizer used in the step (2) adopts dribbling balling machine, and the rotating speed of dribbling balling machine is 12-20r/min, and the dish inclination angle is 35-45 °, and inlet amount is 8-10t/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105760883A CN102070165A (en) | 2010-12-07 | 2010-12-07 | High temperature production process of alpha-aluminum oxide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105760883A CN102070165A (en) | 2010-12-07 | 2010-12-07 | High temperature production process of alpha-aluminum oxide |
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| CN102070165A true CN102070165A (en) | 2011-05-25 |
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| CN2010105760883A Pending CN102070165A (en) | 2010-12-07 | 2010-12-07 | High temperature production process of alpha-aluminum oxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109835929A (en) * | 2019-04-15 | 2019-06-04 | 郑州鑫发材料科技有限公司 | A method of flaky alpha-alumina powder is prepared with saggar calcining |
| CN110372018A (en) * | 2019-07-31 | 2019-10-25 | 中国环境科学研究院 | A method of inactivation aluminum oxide and preparation method thereof, the short chain chlorinated paraffin of qualitative quantitative analysis |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189475A (en) * | 1997-12-16 | 1998-08-05 | 武汉工业大学 | Process for mfg. non-lumps submicron alpha-Al2O3 powder and microlitic corundum ball |
| CN1919737A (en) * | 2005-08-26 | 2007-02-28 | 大连路明纳米材料有限公司 | Method of preparing good dispersion and high-purity ultra-fine alpha-Al2O3 |
| CN101085706A (en) * | 2006-06-08 | 2007-12-12 | 汉中秦元新材料有限公司 | Method for producing sintering plate-like corundum by ultra-high temperature shaft kiln |
-
2010
- 2010-12-07 CN CN2010105760883A patent/CN102070165A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189475A (en) * | 1997-12-16 | 1998-08-05 | 武汉工业大学 | Process for mfg. non-lumps submicron alpha-Al2O3 powder and microlitic corundum ball |
| CN1919737A (en) * | 2005-08-26 | 2007-02-28 | 大连路明纳米材料有限公司 | Method of preparing good dispersion and high-purity ultra-fine alpha-Al2O3 |
| CN101085706A (en) * | 2006-06-08 | 2007-12-12 | 汉中秦元新材料有限公司 | Method for producing sintering plate-like corundum by ultra-high temperature shaft kiln |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109835929A (en) * | 2019-04-15 | 2019-06-04 | 郑州鑫发材料科技有限公司 | A method of flaky alpha-alumina powder is prepared with saggar calcining |
| CN109835929B (en) * | 2019-04-15 | 2021-03-23 | 郑州鑫发材料科技有限公司 | Method for preparing flaky alpha-alumina powder by sagger calcination |
| CN110372018A (en) * | 2019-07-31 | 2019-10-25 | 中国环境科学研究院 | A method of inactivation aluminum oxide and preparation method thereof, the short chain chlorinated paraffin of qualitative quantitative analysis |
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Address after: 256216, Ming County town, Binzhou City, Shandong province Zouping Economic Development Zone Applicant after: Jingang New Materials Co., Ltd. Address before: 256216, Ming County town, Binzhou City, Shandong province Zouping Economic Development Zone Applicant before: Zouping Jingang New Material Co., Ltd. |
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Application publication date: 20110525 |