CN105036164A - Production method of superfine spherical alumina - Google Patents
Production method of superfine spherical alumina Download PDFInfo
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- CN105036164A CN105036164A CN201510342507.XA CN201510342507A CN105036164A CN 105036164 A CN105036164 A CN 105036164A CN 201510342507 A CN201510342507 A CN 201510342507A CN 105036164 A CN105036164 A CN 105036164A
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Abstract
The invention belongs to the preparation field of functional materials of metal oxide powder, particularly relates to a production method of superfine spherical alumina, and provides a novel production method of high temperature gasification to solve the problems of complex manufacturing technology, high cost and high difficulty in technological parameter of the conventional spherical alumina production method at home and abroad. The production method provided by the invention comprises the following steps: a raw material is selected from alumina, aluminum hydroxide and aluminum, and is sent to a gasifier for high-temperature gasification; the gasified material is cooled with a quencher; the cooled material is collected through a bag dust collector and a multistage static electricity dust collector, so as to obtain the superfine spherical alumina powder. The superfine spherical alumina powder obtained according to the method has the advantages that the purity and the quality are high; the particle diameters of the spherical alumina powder can reach D50 0.4 [mu]m and D30 0.1 [mu]m. The method has the advantages that no waste gas, waste water, or solid waste is exhausted during the production process, the investment is low, and the out-put is high, so that the method can be applied to large-scale industrial production.
Description
Technical field
The invention belongs to metal-oxide powder functional materials preparation field, be specifically related to a kind of production method of superfine spherical aluminum oxide.
Background technology
At present, conventional alumina powder jointed be obtain through the inorganic salts thermolysis of Mechanical Crushing or aluminium, these methods are not easy to obtain spherical alumina powder jointed.
The major function of ball-aluminium oxide is heat conduction, for radiator element, heat-radiating substrate weighting agent (MC substrate), Heat sink grease, semiconductor packages resin weighting agent and organosilicon heat radiation binding agent and mixture weighting agent.Secondly also for porcelain filter, refractory materials.Superfine spherical aluminum oxide has high fillibility, the feature of high thermoconductivity and low abradability, in the high-tech area such as microelectronics, aerospace industry, has very wide application prospect.
Ball-aluminium oxide powder surface can be low, rational size distribution, and spherical rate is high, has good grain composition relation, fills number especially greatly, is especially applicable to producing the exigent product of thermal conductivity.Because its outward appearance is spherical, the abrasion of equipment are reduced greatly, can for the higher equipment use of precision, and the work-ing life of extension device, be applicable to various engineering heat-conducting plastic system, all kinds of heat conduction joint sealant, meticulous polishing system, all kinds of rubbery system, silica gel system, epoxy systems.
Corrosion-resistant, high temperature resistant, high rigidity, the high strength that have due to superfine spherical aluminum oxide, resistance to wear, anti-oxidant, good insulating and the superperformance such as surface-area is large, be widely used in high-tech areas such as metallurgy, chemical industry, electronics, national defence, space flight and nuclear industry, the demand annual growth of domestic and international market to ultra-fine alumina constantly increases, and studying new production technology has very important meaning.The ball-aluminium oxide of domestic procurement mainly comes from Japan, Korea S, and the ball-aluminium oxide price of import is high, and the haul-cycle time is long.At present, the method preparing ultra-fine alumina is a lot, is mainly divided into solid phase method, vapor phase process, liquid phase method according to reaction principle.But often kind of method has himself limitation and shortcoming.Solid phase method complex process, alkoxide is expensive, and very difficult preparation is less than the small-particle of 100nm, and particle crystal formation is undesirable.Vapor phase process production efficiency is low, and processing parameter is difficult to control, and device is huge, complex structure, apparatus expensive, and the collection of powder is difficult.In wet chemistry method, agglomeration traits is a difficult problem so far, although many investigators explore out numerous reductions or avoid the solution of reunion, also all there is the limitation of self.
The present invention is in line with economical and practical, and the principle of large suitability for industrialized production, try hard to break through traditional production technology and production method, develop a kind of new production technology, to realize low cost, high yield, mass-producing, produces high-quality superfine spherical aluminum oxide.
Summary of the invention
Producing Problems existing for solving above-mentioned ball-aluminium oxide, the invention provides a kind of novel laser radiation high-temperature gasification production method.Granularity is little, the uniform superfine spherical aluminum oxide of pattern to adopt the method to produce, and invests little, and cost is low, and output is high, can be used for large-scale production.
Technical scheme
The invention provides a kind of production method of superfine spherical aluminum oxide.The method adopts laser as energy, utilizes the high-density power radiation of laser, makes aluminum oxide, the mode of aluminium hydroxide or aluminum feedstock steam raising produces superfine spherical aluminum oxide, specifically comprise the following steps:
Step (1): any one selecting high purity aluminium oxide, high purity aluminium hydroxide or rafifinal is raw material.
Step (2): raw material is delivered in vapourizing furnace and gasify on platform, with the laser direct radiation raw material that laser generator produces, under the high-density power radiation effect of laser, raw material absorbs energy and reaches boiling temperature rapidly, steam raising generates aluminium oxide gas, raw material its reaction process different is different, wherein:
A. aluminum oxide absorbs energy, and direct gasification generates aluminium oxide gas;
B. aluminium hydroxide decomposes becomes aluminum oxide and water, and at high temperature gasifies rapidly, generates aluminium oxide gas;
C. aluminium absorbs energy gasification, at high temperature reacts with the oxygen in air, generates aluminium oxide gas.
Step (3): aluminium oxide gas is sucked expander fast and cools under the effect of induced draft fan, condenses into spherical particle in hot environment.
Step (4): gather dust through bag collection, multistage electrostatic, obtains micron order, Subnano-class and nano-level sphere alumina powder jointed.
In technique scheme, the described cooling of step (3) adopts water-cooled to add air-cooledly to add low temperature liquid nitrogen mode, and aluminium oxide gas by water-cooled, air-cooling chamber and liquid nitrogen chamber, makes aluminium oxide gas cool rapidly under induced draft fan effect.Air-cooled air used will carry out filtering in order to avoid brought into by impurity.
Technique scheme adopts laser radiation high temp. gasification production high-quality ultrafine ball-aluminium oxide.Any one of raw material choose high purity aluminium oxide, high purity aluminium hydroxide or rafifinal, through the technological process such as continuous feeding, laser radiation gasification, low temperature liquid nitrogen strengthening cooling, multistage collection, is continuous flow procedure.Raw material Stimulated Light in vapourizing furnace on gasification platform is high-power, high-energy, high-density radiation, within the extremely short time, temperature sharply raises, radiation center temperature reaches 5,000 more and spends, and makes the violent steam raising of aluminum oxide (or make aluminium hydroxide resolve into aluminum oxide and gasify; Aluminium is gasified and is oxidized), generate aluminium oxide gas.Enter expander afterwards, in quick process of cooling, condense into spheroidal particle.Again through bagroom, one-level electrostatic precipitator, secondary electrostatic dust-precipitator, obtain micron order, Subnano-class and nano-level sphere alumina powder jointed, particle diameter D500.4um, D300.1um.
Laser radiation gasification provides heat source non-contact, makes raw material ensure high purity, and not by the pollution of other impurity, ultrahigh-temperature pneumatolysis also can make other impurity gasification removing in raw material simultaneously, plays purification effect.The ball-aluminium oxide produced thus can reach the requirement of high purity, high quality material.
Present invention process process required equipment mainly comprises laser generator, vapourizing furnace, expander, bagroom, electrostatic precipitator etc.; degassifying stove is outside specific equipment; all the other are conventional equipment; production technique is simple; consume energy low, pollution-free, efficiency is high; invest moderate, be applicable to large-scale industrial and produce.
Beneficial effect
The present invention utilizes laser radiation high temp. gasification can produce high purity, superfine spherical aluminum oxide; particle diameter reaches micron order, Subnano-class and nano level; production technique is simple; production process is discharged without waste gas, waste water, solid waste; do not cause environmental pollution; energy consumption is low, and output is high, can be used for large-scale industrial and produce.
Embodiment
Below in conjunction with non-limiting example, the present invention is further described.
Embodiment 1: select high-purity alpha-alumina to be raw material, is delivered in vapourizing furnace on gasification platform, through the laser radiation heating that laser generator produces, makes aluminum oxide reach rapidly boiling temperature steam raising, generates aluminium oxide gas.Aluminium oxide gas enters expander and cools rapidly under induced draft fan effect, makes gaseous oxidation aluminium condense into spherical particle.Again successively through bagroom, one-level electrostatic precipitator, secondary electrostatic dust-precipitator, obtain micron order, Subnano-class and nano-level sphere alumina powder jointed.
Embodiment 2: select high-purity hydrogen aluminum oxide to be raw material, be delivered in vapourizing furnace on gasification platform, through the laser radiation heating that laser generator produces, make aluminium hydroxide resolve into aluminum oxide and water, and make aluminum oxide reach rapidly boiling temperature steam raising, generate aluminium oxide gas.Aluminium oxide gas enters expander and cools rapidly under induced draft fan effect, makes gaseous oxidation aluminium condense into spherical particle.Again successively through bagroom, one-level electrostatic precipitator, secondary electrostatic dust-precipitator, obtain micron order, Subnano-class and nano-level sphere alumina powder jointed.
Embodiment 3: select raffinal to be raw material, is delivered in vapourizing furnace on gasification platform, through the laser radiation heating that laser generator produces, makes aluminium reach rapidly boiling temperature steam raising, at high temperature reacts with the oxygen in air simultaneously, generate aluminium oxide gas.Aluminium oxide gas enters expander and cools rapidly under induced draft fan effect, makes gaseous oxidation aluminium condense into spherical particle.Again successively through bagroom, one-level electrostatic precipitator, secondary electrostatic dust-precipitator, obtain micron order, Subnano-class and nano-level sphere alumina powder jointed.
Claims (3)
1. the production method of a superfine spherical aluminum oxide, it is characterized in that: adopt laser as energy, utilize the high-density power radiation of laser, make aluminum oxide, the mode of aluminium hydroxide or aluminum feedstock steam raising produces superfine spherical aluminum oxide, specifically comprise the following steps:
Step (1): any one selecting high purity aluminium oxide, high purity aluminium hydroxide or rafifinal is raw material;
Step (2): raw material is delivered in vapourizing furnace and gasify on platform, with the laser direct radiation raw material that laser generator produces, under the high-density power radiation effect of laser, raw material absorbs energy and reaches boiling temperature rapidly, steam raising generates aluminium oxide gas, raw material its reaction process different is different, wherein:
A. aluminum oxide absorbs energy, and direct gasification generates aluminium oxide gas;
B. aluminium hydroxide decomposes becomes aluminum oxide and water, and at high temperature gasifies rapidly, generates aluminium oxide gas;
C. aluminium absorbs energy gasification, at high temperature reacts with the oxygen in air, generates aluminium oxide gas;
Step (3): aluminium oxide gas is sucked expander fast and cools under the effect of induced draft fan, condenses into spherical particle in hot environment;
Step (4): gather dust through bag collection, multistage electrostatic, obtains micron order, Subnano-class and nano-level sphere alumina powder jointed.
2. the production method of superfine spherical aluminum oxide according to claim 1, it is characterized in that: the described cooling of step (3) adopts water-cooled to add air-cooledly to add low temperature liquid nitrogen mode, aluminium oxide gas by water-cooled, air-cooling chamber and liquid nitrogen chamber, makes aluminium oxide gas cool rapidly under induced draft fan effect.Air-cooled air used will carry out filtering in order to avoid brought into by impurity.
3. the production method of superfine spherical aluminum oxide according to claim 1, is characterized in that: the method equipment used comprises laser generator, vapourizing furnace, expander, bagroom, electrostatic precipitator.
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| CN201510342507.XA CN105036164A (en) | 2015-06-13 | 2015-06-13 | Production method of superfine spherical alumina |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108598453A (en) * | 2018-03-29 | 2018-09-28 | 天水佳吉化工有限公司 | A kind of production method of nanometer of submicron spherical silica flour |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6395101A (en) * | 1986-10-13 | 1988-04-26 | Nkk Corp | Production of ultrafine particle |
-
2015
- 2015-06-13 CN CN201510342507.XA patent/CN105036164A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6395101A (en) * | 1986-10-13 | 1988-04-26 | Nkk Corp | Production of ultrafine particle |
Non-Patent Citations (2)
| Title |
|---|
| 尹良果: "纳米α-氧化铝的制备及其改性", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
| 李岩等: "纳米氧化铝的制备及其改性研究", 《黑龙江科学》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108598453A (en) * | 2018-03-29 | 2018-09-28 | 天水佳吉化工有限公司 | A kind of production method of nanometer of submicron spherical silica flour |
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Inventor after: Liu Peijia Inventor after: Liu Yinna Inventor after: Wang Hongbo Inventor after: Liu Liang Inventor before: Liu Yinna Inventor before: Liu Peijia Inventor before: Wang Hongbo Inventor before: Liu Liang |
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