CN104150883A - Preparation method of alumina granulating powder - Google Patents
Preparation method of alumina granulating powder Download PDFInfo
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- CN104150883A CN104150883A CN201410308502.0A CN201410308502A CN104150883A CN 104150883 A CN104150883 A CN 104150883A CN 201410308502 A CN201410308502 A CN 201410308502A CN 104150883 A CN104150883 A CN 104150883A
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Abstract
The invention discloses a preparation method of alumina granulating powder, belonging to the technical field of ceramic. According to the method, the preferable specially-made alumina powder is used as the main raw material; sludge grain size distribution is controlled by adopting a unique ball-milling process; and the effect that granular granulating powder sprayed through a wet method is similar to dry-milling granulating powder (micro powder) in the use process can be achieved through surface modified granulating powder by adopting a composite additive. The alumina granulating powder prepared by the method disclosed by the invention is applied to hot pressure-casting and forming equipment of various factories on the market currently; and the sintered product is good in precision, non-deformable and good in polishing effect.
Description
Technical field
The present invention relates to a kind of aluminum oxide pelletizing and preparation method thereof, belong to ceramic technology field.
Background technology
Alumina-ceramic physical strength is high, hardness is large, corrosion-resistant, and raw material sources are wide, low price is widely used in fields such as filler, grinding medium, wear-resistant liner, corrosion-resistant finishess.
Aluminum oxide pelletizing is an extended industry along with the development of alumina-ceramic industry, and its market demand is very huge.Except for alumina-ceramic, be also applicable to high-grade sealing member, electron trade, textile industry, military industry, Abrasive Industry etc.Wherein for the molded aluminum oxide pelletizing market demand of Rapid dry 50000 tons/year of left and right.And manufacturer is more scattered, output is little, industry standard disunity.
At present mainly adopt centrifugal or press spray drying process to make for the molded aluminum oxide pelletizing of Rapid dry.In use there is following problem in the aluminum oxide pelletizing making like this: full particle prepared by centrifugal granulating tower is too thin, molded for Rapid dry, easily produces cracking, demixing phenomenon, and reclaimed materials causes pelletizing qualification rate too low too much simultaneously; And the pelletizing that adopts pressure type drying tower to prepare has certain hollow bead to exist, cause produced alumina article to there will be pin hole in later stage polishing process.
The pelletizing that is applicable to 20 times/min Rapid dry press forming device is different from common pelletizing, that its pelletizing is necessary for is spherical, full particle, unit weight are large, grain composition is suitable, so that in Rapid Prototyping Process because pelletizing good fluidity, tap density are large, clearance air is few and smooth moulding facilitates later stage retrofit, polishing yield rate.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, and a kind of quick dry-pressing aluminum oxide pelletizing and preparation method thereof is provided.
Principal feature of the present invention is to adopt special raw material and formula system for relying on, and adopts constant temperature ball-milling technology to improve grinding efficiency and controls grain size distribution; Adopt the centrifugal-drying plant combining of spraying to reach control pelletizing pattern and grain composition object.The aluminum oxide pelletizing of preparation is applicable to 20 times/min Rapid dry press forming device in the market, and the product of firing is easy to the complete processings such as polishing.
Technical scheme of the present invention is as follows:
A preparation method for aluminum oxide pelletizing, is characterized in that,
(1) raw material and weight part
Major ingredient: aluminum oxide powder 80-92 part, kaolin 3-15 part;
Complex sintering aids: magnesium oxide 0.5-5 part, calcium carbonate 0.5-5 part, silicon powder 0.5-5 part;
(2) aluminum oxide powder, kaolin, silicon powder and complex sintering aids are weighed respectively after together with put into intermittent ball mill constant temperature ball milling, qualified rear mistake 180 mesh sieves of fineness, obtain ceramic mud after electromagnetism deironing;
(3) adopt surge pump to squeeze in transferring cylinder step (2) ceramic mud and stir after half an hour, add 1-5% composite additive, carry out strong stirring;
(4) ceramic mud step (3) being obtained adopts the mist projection granulating tower of centrifugal-pressure combination to be dried to ceramic prilling powder, crosses 40 mesh sieves and removes the larger agglomerating particles that on tower wall, caking forms;
(5) ceramic prilling powder step (4) being obtained is by after feed bin homogenizing, and pelletizing is mixed 0.3-1 ‰ releasing agent in blender, is packaged to be a kind of dry-pressing aluminum oxide pelletizing fast.
Above-mentioned steps (5) mainly packs pelletizing into feed bin and adds micro-releasing agent.The object of feeding warehouse is to carry out batch pelletizing homogenizing and old; Mixed micro-releasing agent object is that less friction improves alloy mold access times.
Preferably, the preparation method of described aluminum oxide powder is: by moisture be 2-3% aluminium hydroxide and commercial alumina powder in high temperature rotary kiln 1380-1400 DEG C fire and form;
Described moisture is that the weight ratio of 2-3% aluminium hydroxide and commercial alumina powder is 1:3.
Above-mentioned aluminum oxide powder has larger activity, detects former footpath centralized particle diameter after ball milling, D90=5 μ m left and right, and aluminium powder is residual without mineralizer.The AL-Si-Mg-Ca quaternary formula system adopting, adopts pure solid state sintering, has ensured intensity and the toughness of product, facilitates later stage polishing to use.
Preferably, in described step (2), while adopting intermittent ball mill ball milling, adopting alumina balls masonry is grinding medium, material: ball: water=1:2-3:1; Ball mill physical dimension 3000*4500mm, rotating speed 13r/min, Ball-milling Time 25-35 hour, slurry fineness D90 < 7 μ m, slurry water is divided and is controlled at 35-55%.
Described ball-milling technology is: add the 60-70 DEG C of hot water grinding machine of directly scoring in early stage, at ball milling after two hours, formulation material and water form to be opened ball milling cover after mud and pass into hot steam second-heating to 70-80 DEG C, until ball milling finishes.Best, the easy ball milling of material of slip fluidity under the condition of high temperature, improves grinding efficiency very obvious.
Preferably, described in described step (3), composite additive is water-soluble polyvinyl alcohol: dispersion agent: starch=3:1:1.
Preferably, the rotating speed of the strong stirring described in described step (3) is 60 turn/min.
Ceramic mud carries out strong stirring (reaching 60 turn/min) and after half an hour, adds composite additive (water-soluble polyvinyl alcohol: dispersion agent: starch=3:1:1) in transferring cylinder, directly adds dispersion agent and polyvinyl alcohol to avoid causing dispersion agent, polyvinyl alcohol and starch to lose efficacy at ball mill ball milling and high temperature in transferring cylinder.Stir fast formation circulation whirlpool and reached the object that mixes, prevents mud sediment and froth breaking, do not add the additive such as glycerine, emulsifying wax at needs.
Preferably, described in described step (4) centrifugal-the mist projection granulating tower of pressure combination is: the cylindrical shell of centrifugal spray tower is increased, 1/3 place's setting pressure formula spray gun below cylindrical shell, spray tower is equipped with two and overlaps independently pulp feeding system; Described centrifugal-processing condition of the mist projection granulating tower of pressure combination are: spray gun pressure is 2-3MPa, adopts aperture 1.8mm spray sheet; Turn/min of centrifugal rotational speed 2000; Spray tower temperature suitable for reading is controlled at 350-380 DEG C, and end opening temperature is controlled at 80-100 DEG C, and powder moisture controlled is at 0.5-5%.
Adopt the pelletizing medium particle diameter of transformed mist projection granulating tower collection in 140 orders left and right, slurry is fully removed moisture and mixes through the hot blast stirring in the process of cylindrical shell inner drying, wherein centrifugal pellet is thinner full particle, be equipped with micro-pressure coarse particles, only need to cross 40 mesh sieves and remove sticky wall caking, minus mesh is all qualified pelletizing.By regulating Spray Gun Of The Pressure or centrifugal atomizing dish stock volume, adjust pelletizing pattern, solid degree and grain composition, fundamentally solve independent centrifugal or pressure-type spray tower moulding that granulation produces, product later stage polishing problem.
Step of the present invention (5) mainly packs pelletizing into feed bin and adds micro-releasing agent.The object of feeding warehouse is to carry out batch pelletizing homogenizing and old; Mixed micro-releasing agent object is that less friction improves alloy mold access times.
Preferably, described releasing agent is hard magnesium and calcium stearate mixture.
Preferably, the weight ratio of described hard magnesium and calcium stearate is 1:2.
The present invention compared with prior art, has following outstanding feature:
(1) the present invention is fired into noresidue mineralizer, oxide of high activity aluminium powder as main raw material taking the raw material mixing without mineralizer in the situation that in rotary kiln, adopt quaternary formula system and solid-phase sintering process, product has higher-strength and toughness, is difficult for collapsing limit, yield rate is high, wear-resisting and sealing property is better in the deep processing stages such as later stage polishings.
(2) to adopt the constant temperature ball-milling technology of original creation be to add the hot water grinding machine of directly scoring in early stage in the present invention, at ball milling after two hours, formulation material and water form after mud is opened ball milling cover and pass into hot steam second-heating, until slurry keeps continuous high temperature in last blowing ball mill, best, the easy ball milling of material of slip fluidity under the condition of high temperature, improves grinding efficiency very obvious.
(3) the present invention adds various composite additives in transferring cylinder, reach the object that mixes, prevents mud sediment and froth breaking by strong stirring, avoid various additives after ball milling, to lose efficacy in ball mill, finally can less or not add some additive and reach obvious effect.
(4) the present invention adopts originality thinking to carry out the combination transformation of pressure and Centrafugal spray drying tower, thereby regulate and control pelletizing exterior appearance and pelletizing performance by many kinds of parameters, fundamentally solved independent centrifugal or pressure-type spray tower moulding that granulation produces, product later stage polishing problem.Do not need to remove powder below 200 orders and improve powder qualification rate, spherical, determine that without the granule-morphology of adhesion it has better mobility, be suitable for Rapid dry molded, later stage polishing there will not be needle pore defect.
(5) features such as it is high that the aluminum oxide pelletizing that the present invention produces has yield rate, and granule-morphology is good, and applicable Rapid dry is molded; The product of firing shrinks easy to control, and limit, yield rate high are not turned black, do not collapsed to post-production.
Brief description of the drawings
Fig. 1 process flow sheet of the present invention.
Embodiment
Embodiment is only described further the present invention, but is not limited only to this, and those skilled in the art obtains other embodiment under the prerequisite of not paying creative work, all belongs to the scope of protection of the invention.
Aluminum oxide powder be by moisture be during 2-3% aluminium hydroxide and commercial alumina powder are blended in high temperature rotary kiln with 1:3 ratio 1380-1400 DEG C fire and form.Its aluminum oxide powder has larger activity, detects former footpath centralized particle diameter after ball milling, D90=5 μ m left and right, and aluminium powder is residual without mineralizer.The chemical composition of other raw materials sees the above table 1.Adopt the few high quality raw material of alkali metal content of high-quality.
The chemical constitution of other raw materials of table 1 and weight part
Embodiment 1:
(1) raw material and weight part
Major ingredient: 92 parts of aluminum oxide powders, 3 parts of kaolin;
Complex sintering aids: 3 parts, magnesium oxide, 1 part, calcium carbonate, 1 part of silicon powder;
(2) aluminum oxide powder, kaolin, silicon powder and complex sintering aids are weighed respectively after together with put into intermittent ball mill constant temperature ball milling (adopting alumina balls masonrys be grinding medium, material: ball: water=1:2.3:1), qualified rear mistake 180 mesh sieves of fineness, after electromagnetism deironing, obtain ceramic mud, ball mill physical dimension 3000*4500mm, rotating speed 13r/min, Ball-milling Time 25 hours, slurry fineness D90 < 6.8 μ m; Add 60 DEG C of hot water grinding machine of directly scoring in early stage, at ball milling, after two hours, formulation material and water pass into hot steam second-heating to 70 DEG C after forming mud, until slurry keeps continuous high temperature in last blowing ball mill.
(3) adopt surge pump to squeeze in transferring cylinder step (2) ceramic mud and stir after half an hour, add 1% composite additive (water-soluble polyvinyl alcohol: dispersion agent=3:1), carry out strong stirring.
(4) ceramic mud step (3) being obtained adopts the mist projection granulating tower of centrifugal-pressure combination to be dried to ceramic prilling powder, crosses on 40 mesh sieves removal tower walls and lumps.Its technique is: spray gun pressure is 2MPa, adopts aperture 1.8mm spray sheet; Turn/min of centrifugal rotational speed 2000; Spray tower temperature suitable for reading is controlled at 350 DEG C, and end opening temperature is controlled at 80 DEG C, and powder moisture controlled is 5%.
(5) ceramic prilling powder step (4) being obtained is by after feed bin homogenizing, and mixed 0.3 ‰ releasing agents (weight ratio of hard magnesium and calcium stearate is 1:2) are packaged to be a kind of dry-pressing aluminum oxide pelletizing fast.
Product performance detect and see the following form 2.
Embodiment 2:
(1) raw material and weight part
Major ingredient: 90 parts of aluminum oxide powders, 3 parts of kaolin;
Complex sintering aids: 3 parts, magnesium oxide, 2 parts, calcium carbonate, 2 parts of silicon powders;
(2) aluminum oxide powder, kaolin, silicon powder and complex sintering aids are weighed respectively after together with put into intermittent ball mill constant temperature ball milling (adopting alumina balls masonrys be grinding medium, material: ball: water=1:2.6:1), qualified rear mistake 180 mesh sieves of fineness, after electromagnetism deironing, obtain ceramic mud, ball mill physical dimension 3000*4500mm, rotating speed 13r/min, Ball-milling Time 26 hours, slurry fineness D90 < 6.5 μ m; Add 70 DEG C of hot water grinding machine of directly scoring in early stage, at ball milling, after two hours, formulation material and water pass into hot steam second-heating to 72 DEG C after forming mud, until slurry keeps continuous high temperature in last blowing ball mill.
(3) adopt surge pump to squeeze in transferring cylinder step (2) ceramic mud and stir after half an hour, add 2% composite additive (water-soluble polyvinyl alcohol: dispersion agent=3:1), carry out strong stirring.
(4) ceramic mud step (3) being obtained adopts the mist projection granulating tower of centrifugal-pressure combination to be dried to ceramic prilling powder, crosses on 40 mesh sieves removal tower walls and lumps.Its technique is: spray gun pressure is 2.2MPa, adopts aperture 1.8mm spray sheet; Turn/min of centrifugal rotational speed 2000; Spray tower temperature suitable for reading is controlled at 370 DEG C, and end opening temperature is controlled at 95 DEG C, and powder moisture controlled is 0.5%.
(5) ceramic prilling powder step (4) being obtained is by after feed bin homogenizing, and mixed 0.8 ‰ releasing agents (weight ratio of hard magnesium and calcium stearate is 1:2) are packaged to be a kind of dry-pressing aluminum oxide pelletizing fast.
Product performance detect and see the following form 2.
Embodiment 3:
(1) raw material and weight part
Major ingredient: 85 parts of aluminum oxide powders, 8 parts of kaolin;
Complex sintering aids: 1 part, magnesium oxide, 3 parts, calcium carbonate, 3 parts of silicon powders;
(2) aluminum oxide powder, kaolin, silicon powder and complex sintering aids are weighed respectively after together with put into intermittent ball mill constant temperature ball milling (adopting alumina balls masonrys be grinding medium, material: ball: water=1:2.9:1), qualified rear mistake 180 mesh sieves of fineness, after electromagnetism deironing, obtain ceramic mud, ball mill physical dimension 3000*4500mm, rotating speed 13r/min, Ball-milling Time 26 hours, slurry fineness D90 < 6.5 μ m; Add 65 DEG C of hot water grinding machine of directly scoring in early stage, at ball milling, after two hours, formulation material and water pass into hot steam second-heating to 80 DEG C after forming mud, until slurry keeps continuous high temperature in last blowing ball mill.
(3) adopt surge pump to squeeze in transferring cylinder step (2) ceramic mud and stir after half an hour, add 3.2% composite additive (water-soluble polyvinyl alcohol: dispersion agent=3:1), carry out strong stirring.
(4) ceramic mud step (3) being obtained adopts the mist projection granulating tower of centrifugal-pressure combination to be dried to ceramic prilling powder, crosses on 40 mesh sieves removal tower walls and lumps.Its technique is: spray gun pressure is 3MPa, adopts aperture 1.8mm spray sheet; Turn/min of centrifugal rotational speed 2000; Spray tower temperature suitable for reading is controlled at 368 DEG C, and end opening temperature is controlled at 95 DEG C, and powder moisture controlled is 1.2%.
(5) ceramic prilling powder step (4) being obtained is by after feed bin homogenizing, and mixed 0.8 ‰ releasing agents (weight ratio of hard magnesium and calcium stearate is 1:2) are packaged to be a kind of dry-pressing aluminum oxide pelletizing fast.
Product performance detect and see the following form 2.
In table 2 embodiment 1-3, product performance detect data
| ? | Pelletizing unit weight | Molding effect | Become porcelain density g/cm 3 | Contraction ratio | Polishing effect |
| Embodiment 1 | 1.16 | Without cracking, layering | 3.73 | 1.16 | Without stain, do not collapse limit |
| Embodiment 2 | 1.20 | Without cracking, layering | 3.68 | 1.16 | Without stain, do not collapse limit |
| Embodiment 3 | 1.18 | Without cracking, layering | 3.60 | 1.16 | Without stain, do not collapse limit |
Claims (9)
1. a preparation method for aluminum oxide pelletizing, is characterized in that,
(1) raw material and weight part
Major ingredient: aluminum oxide powder 80-92 part, kaolin 3-15 part;
Complex sintering aids: magnesium oxide 0.5-5 part, calcium carbonate 0.5-5 part, silicon powder 0.5-5 part;
(2) aluminum oxide powder, kaolin, silicon powder and complex sintering aids are weighed respectively after together with put into intermittent ball mill constant temperature ball milling, qualified rear mistake 180 mesh sieves of fineness, obtain ceramic mud after electromagnetism deironing;
(3) adopt surge pump to squeeze in transferring cylinder step (2) ceramic mud and stir after half an hour, add 1-5% composite additive, carry out strong stirring;
(4) ceramic mud step (3) being obtained adopts the mist projection granulating tower of centrifugal-pressure combination to be dried to ceramic prilling powder, crosses 40 mesh sieves and removes the larger agglomerating particles that on tower wall, caking forms;
(5) ceramic prilling powder step (4) being obtained is by after feed bin homogenizing, and pelletizing is mixed 0.3-1 ‰ releasing agent in blender, is packaged to be a kind of dry-pressing aluminum oxide pelletizing fast.
2. preparation method according to claim 1, is characterized in that,
The preparation method of described aluminum oxide powder is: by moisture be 2-3% aluminium hydroxide and commercial alumina powder in high temperature rotary kiln 1380-1400 DEG C fire and form;
Described moisture is that the weight ratio of 2-3% aluminium hydroxide and commercial alumina powder is 1:3.
3. preparation method according to claim 1, is characterized in that, in described step (2), while adopting intermittent ball mill ball milling, adopting alumina balls masonry is grinding medium, material: ball: water=1:2-3:1; Ball mill physical dimension 3000*4500mm, rotating speed 13r/min, Ball-milling Time 25-35 hour, slurry fineness D90 < 7 μ m, slurry water is divided and is controlled at 35-55%.
4. preparation method according to claim 3, it is characterized in that, described ball-milling technology is: add the 60-70 DEG C of hot water grinding machine of directly scoring in early stage, at ball milling after two hours, after formulation material and water formation mud, open ball milling cover and pass into hot steam second-heating to 70-80 DEG C, until ball milling finishes.
5. preparation method according to claim 1, is characterized in that, described in described step (3), composite additive is water-soluble polyvinyl alcohol: dispersion agent: starch=3:1:1.
6. preparation method according to claim 1, is characterized in that, the rotating speed of the strong stirring described in described step (3) is 60 turn/min.
7. preparation method according to claim 1, it is characterized in that, described in described step (4) centrifugal-the mist projection granulating tower of pressure combination is: the cylindrical shell of centrifugal spray tower is increased, 1/3 place's setting pressure formula spray gun below cylindrical shell, spray tower is equipped with two and overlaps independently pulp feeding system; Described centrifugal-processing condition of the mist projection granulating tower of pressure combination are: spray gun pressure is 2-3MPa, adopts aperture 1.8mm spray sheet; Turn/min of centrifugal rotational speed 2000; Spray tower temperature suitable for reading is controlled at 350-380 DEG C, and end opening temperature is controlled at 80-100 DEG C, and powder moisture controlled is at 0.5-5%.
8. preparation method according to claim 1, is characterized in that, described releasing agent is hard magnesium and calcium stearate mixture.
9. preparation method according to claim 8, is characterized in that, the weight ratio of described hard magnesium and calcium stearate is 1:2.
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| CN105367046A (en) * | 2015-11-27 | 2016-03-02 | 常熟市银洋陶瓷器件有限公司 | Preparation process suitable for high-temperature co-fired aluminium oxide ceramic granulated powder |
| CN105924140A (en) * | 2016-05-10 | 2016-09-07 | 金刚新材料股份有限公司 | Method for preparing high-pressure-resistance alumina grinding medium through roll forming |
| CN107021762A (en) * | 2017-06-01 | 2017-08-08 | 景德镇陶瓷大学 | A kind of method for improving architectural pottery non-slurry pelletizing powder mobility |
| CN107337441A (en) * | 2017-07-10 | 2017-11-10 | 河北盛平电子科技有限公司 | A kind of ceramics and its manufacture method |
| CN107415023A (en) * | 2017-09-20 | 2017-12-01 | 莫玉明 | A kind of prilling process in aluminium porcelain ball production process |
| CN108832127A (en) * | 2018-05-18 | 2018-11-16 | 宜兴市东山新型材料有限公司 | A kind of manufacturing method and application thereof of PAA dry powder |
| CN108911716A (en) * | 2018-08-15 | 2018-11-30 | 娄底市安地亚斯电子陶瓷有限公司 | A kind of auto parts and components manufacture ceramic prilling powder and preparation method thereof |
| CN111747430A (en) * | 2020-06-18 | 2020-10-09 | 山东亿莱盛新材料科技有限公司 | Method for preparing low-sodium spherical alumina powder by using centrifugal spray tower |
| CN113060746A (en) * | 2021-04-14 | 2021-07-02 | 雅安百图高新材料股份有限公司 | Preparation method of large-particle-size alumina raw material and spherical alumina product thereof |
| CN113173779A (en) * | 2021-04-29 | 2021-07-27 | 江西工陶院精细陶瓷有限公司 | Alumina filler particle, preparation method thereof and preparation method of alumina filler ball |
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| CN105367046B (en) * | 2015-11-27 | 2018-01-16 | 常熟市银洋陶瓷器件有限公司 | A kind of preparation technology for the alumina ceramic prilling powder for being suitable for high temperature co-firing |
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| CN105924140A (en) * | 2016-05-10 | 2016-09-07 | 金刚新材料股份有限公司 | Method for preparing high-pressure-resistance alumina grinding medium through roll forming |
| CN105924140B (en) * | 2016-05-10 | 2018-07-24 | 金刚新材料股份有限公司 | A kind of method that rolling molding prepares high resistance to compression aluminum oxide milling media |
| CN107021762A (en) * | 2017-06-01 | 2017-08-08 | 景德镇陶瓷大学 | A kind of method for improving architectural pottery non-slurry pelletizing powder mobility |
| CN107337441A (en) * | 2017-07-10 | 2017-11-10 | 河北盛平电子科技有限公司 | A kind of ceramics and its manufacture method |
| CN107337441B (en) * | 2017-07-10 | 2019-11-19 | 河北盛平电子科技有限公司 | A kind of ceramic and its manufacturing method |
| CN107415023A (en) * | 2017-09-20 | 2017-12-01 | 莫玉明 | A kind of prilling process in aluminium porcelain ball production process |
| CN108832127A (en) * | 2018-05-18 | 2018-11-16 | 宜兴市东山新型材料有限公司 | A kind of manufacturing method and application thereof of PAA dry powder |
| CN108911716A (en) * | 2018-08-15 | 2018-11-30 | 娄底市安地亚斯电子陶瓷有限公司 | A kind of auto parts and components manufacture ceramic prilling powder and preparation method thereof |
| CN111747430A (en) * | 2020-06-18 | 2020-10-09 | 山东亿莱盛新材料科技有限公司 | Method for preparing low-sodium spherical alumina powder by using centrifugal spray tower |
| CN113060746A (en) * | 2021-04-14 | 2021-07-02 | 雅安百图高新材料股份有限公司 | Preparation method of large-particle-size alumina raw material and spherical alumina product thereof |
| CN113173779A (en) * | 2021-04-29 | 2021-07-27 | 江西工陶院精细陶瓷有限公司 | Alumina filler particle, preparation method thereof and preparation method of alumina filler ball |
| CN114180978A (en) * | 2021-12-27 | 2022-03-15 | 晋城市三英精细材料有限公司 | Preparation method of high-temperature ceramic kiln tool and kiln tool manufactured by same |
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