CN103274674B - Preparation method of alumina porcelain ball for dry process ball mill - Google Patents
Preparation method of alumina porcelain ball for dry process ball mill Download PDFInfo
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- CN103274674B CN103274674B CN201310239889.4A CN201310239889A CN103274674B CN 103274674 B CN103274674 B CN 103274674B CN 201310239889 A CN201310239889 A CN 201310239889A CN 103274674 B CN103274674 B CN 103274674B
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229910052573 porcelain Inorganic materials 0.000 title abstract description 9
- 238000001035 drying Methods 0.000 title abstract 2
- 239000000843 powder Substances 0.000 claims abstract description 76
- 238000000498 ball milling Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000005245 sintering Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 12
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 12
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004927 clay Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 6
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- 238000000227 grinding Methods 0.000 claims description 28
- 239000000919 ceramic Substances 0.000 claims description 23
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 23
- 239000013078 crystal Substances 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 12
- 230000009466 transformation Effects 0.000 claims description 12
- 238000010304 firing Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 206010020843 Hyperthermia Diseases 0.000 claims description 8
- 230000036031 hyperthermia Effects 0.000 claims description 8
- 239000000454 talc Substances 0.000 claims description 7
- 235000012222 talc Nutrition 0.000 claims description 7
- 229910052623 talc Inorganic materials 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 239000003595 mist Substances 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- NWXHSRDXUJENGJ-UHFFFAOYSA-N calcium;magnesium;dioxido(oxo)silane Chemical compound [Mg+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O NWXHSRDXUJENGJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052637 diopside Inorganic materials 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 claims description 2
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 2
- 239000004327 boric acid Substances 0.000 claims description 2
- 238000001694 spray drying Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 28
- 239000004411 aluminium Substances 0.000 abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 21
- 238000005453 pelletization Methods 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
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- 238000006243 chemical reaction Methods 0.000 abstract 1
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- 230000007547 defect Effects 0.000 description 15
- 238000009837 dry grinding Methods 0.000 description 9
- 208000035874 Excoriation Diseases 0.000 description 6
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- 150000001398 aluminium Chemical class 0.000 description 5
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- 230000008602 contraction Effects 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 238000001238 wet grinding Methods 0.000 description 2
- 241000276489 Merlangius merlangus Species 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003701 mechanical milling Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 102220042174 rs141655687 Human genes 0.000 description 1
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- 238000001778 solid-state sintering Methods 0.000 description 1
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Abstract
The invention discloses a preparation method of an alumina porcelain ball for a dry process ball mill. The method adopts self-baked alumina powder as main material; alumina powder bought from Shandong Aluminium Corporation is used as auxiliary material; flint clay clinker, kaolin and complex sintering assistant are added; and the end product can be obtained after triple special ball milling, spray pelletization ball formation, and low temperature slow baking. The self-baked alumina disclosed by the invention has a conversion rate of 98%; the D90 is smaller than 3 microns; uniform and unified alumina powder is obtained through adding complex mineralizer, and is a mixture of sheet structure and column structure; ball milling is made from self-baked alumina powder and alumina powder bought from the market according to a reasonable proportion; the purpose of increasing impact resistance is achieved without using expensive raw material; through triple special ball milling process, the purposes of adjusting alumina dry ball mill microstructure, optimizing property and lowering manufacture cost are achieved; and the alumina porcelain ball has the characteristics of low abrasion, high intensity, high density, fewer inner deficiencies, good impact resistance and the like, so that the comprehensive performance is excellent.
Description
Technical field
The present invention relates to a kind of dry ball milling alumina ball preparation method, belong to new material technology field.
Background technology
Along with scientific and technical high speed development, pottery is proposed to new challenge.Alumina ball, because having the features such as hardness is high, density is large, wear-resisting, corrosion-resistant, is widely used in the industries such as construction sanitary ceramic, industrial ceramics, electronic ceramics, high-grade refractory materials, special cement, non-metallic minerals and coating, paint as grinding medium.
The visual appearance of alumina ball, physicochemical property have strict requirement (with reference to national standard JCT848.1-2010 wear-resisting alumina ball), and Chinese patent CN102491735A discloses a kind of method for producing aluminium oxide ceramic ball.Be specially: take ceramic powder by following weight ratio: 89.5%-94.5% alpha-aluminium oxide powder, 3%-6% Suzhou soil, 1.5%-2% rhombspar, 0.5%-1.5% burns talcum, 0.5-1% coarse whiting, by stirring abrading-ball mill, rolling moulding, burn till, polishing obtains aluminium oxide ceramic ball.The alpha-aluminium oxide powder transformation efficiency 96% that this invention adopts, D90=3.76 μ m through rolling moulding, burns till at 1490 DEG C of temperature of minimum temperature, can meet the requirement of wet ball grinding medium.But because the aluminium powder transformation efficiency using is on the low side, wherein 4% gamma oxidation aluminium powder crystalline phase in sintering process transforms the contraction meeting producing and produces a large amount of UNICOM's pores in preparation inside, causes interiors of products structure variation; The porcelain ball shock resistance of the moulding of rolling is simultaneously poor, and is not suitable as the grinding medium of dry method; And slurry crystal grain after simple stirring abrading-ball mill belongs to irregularly shaped, its surface produces a large amount of sharp keen corner angle, hinders sintering and compact structure, thus this patent burn till minimum temperature also at 1490 DEG C, cause manufacturing cost and the increase of kiln furnitures cost.
On the basis that alumina ball requires at wet grinding medium as the grinding medium of dry ball milling technique, except grinding media wear is had strict demand, most importantly the inner necessary defect of grinding medium is few, and shock resistance is good.For the demand of existing market, there are many patent descriptions and in alumina-ceramic, added the materials such as silicon carbide, rare earth, zirconium white, by the toughness reinforcing effect that reaches high impact properties of crystal grain, wherein the starting material of additional costliness and complicated technique increase too much production cost, be not suitable for large production application, add-on control is simultaneously bad increases the interiors of products defect directly causing, and performance directly worsens.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, and a kind of dry ball milling alumina ball preparation method is provided.The method is certainly to burn alpha-aluminium oxide powder as main raw material, be equipped with the alpha-aluminium oxide powder of outsourcing Shandong Aluminum Co., Ltd., adopting brand-new production technique is basis, under lower raw materials cost and manufacturing cost, prepare product and there is low abrasion, high strength, high-density, the features such as shock resistance is good, are suitable for the specification of quality of various industries to dry grinding medium completely, simultaneously as wet grinding media excellent product performance.
Technical scheme of the present invention is as follows: a kind of dry ball milling alumina ball preparation method, it is characterized in that,
(1) raw material and weight part
Major ingredient: certainly burn 50～70 parts of aluminum oxide powders, commercial alumina powder 30-40 part, kaolin 3-5 part, flint clay grog 2-3 part;
Complex sintering aids: diopside 0.5-5 part, talcum 0.5-5 part, rhombspar 0.5-5 part;
(2) will together with weighing respectively with complex sintering aids, burning aluminum oxide powder, commercial alumina powder, kaolin, flint clay grog add (adopting alumina balls masonry is grinding medium, in mass ratio material: ball: water=1:2-3:0.8) in intermittent ball mill to carry out wet ball grinding (slurry water point is controlled at 40-45%); Qualified rear mistake 40 mesh sieves of fineness, (this step does not need to add water to pump slurry into ball milling in horizontal sand mill with ram pump; Grinding medium adopts wear-resisting alumina microballon, in mass ratio slurry: ball=1:4, speed of mainshaft 1200-1500r/min), qualified rear mistake 180 mesh sieves of fineness are put into transfer stock tank; (employing alumina balls are grinding medium, in mass ratio slurry: ball=1:3), qualified rear mistake 180 mesh sieves of fineness, obtain ceramic mud after electromagnetism deironing to pump slurry into ball milling in intermittent ball mill with ram pump again;
(3) ceramic mud step (2) being obtained adopts centrifugal mist projection granulating tower dry, crosses 40 orders and 140 mesh sieves in double-deck roto-sifter, obtains the ceramic prilling powder between 40-140 order;
(4) ceramic prilling powder step (3) being obtained is pressed into work in-process ball base in automatic nodulizer;
(5) step (4) the work in-process ball base that obtains is adopted to the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1400～1430 DEG C with the rate of heating of 8～25 DEG C/min from room temperature burns till, insulation 8-12h, with the speed of cooling cooling of 15～30 DEG C/min, obtain dry ball milling alumina ball again.
Traditional technology and comparison of process flow of the present invention are shown in Fig. 1-Fig. 2.
Certainly the preparation method who burns aluminum oxide powder of step of the present invention (1) is: gamma-alumina powder adds the composite mineralizer of its quality 2-3 ‰, and (component of described composite mineralizer and weight ratio thereof are, aluminum fluoride: boric acid: ammonium chloride=1:0.7:0.5) pack in silicon carbide sagger and fire and form at the hyperthermia tunnel Kiln top layer of firing work in-process ball base, firing temperature 1400-1430 DEG C.Prepared aluminum oxide transformation efficiency > 98%, former crystal grain footpath D90 < 3 μ m, belong to column and sheet and mix crystalline structure, and wherein column accounts for 60 ± 5%, sheet 40 ± 5%(is shown in Fig. 6).The commercial alumina powder of step of the present invention (1) is produced by Shandong Aluminium Industry Co., Ltd, its transformation efficiency > 98%, and former crystal grain footpath D90 < 3.5 μ m, are sheet structure (see figure 3).Use the little aluminium powder in higher, the former crystal grain of transformation efficiency footpath can reduce the subsurface defect causing in contraction process, improve grinding efficiency simultaneously.Various aluminium powder performance comparison are in table 1, and surface structure is shown in Fig. 3-6.
Table 1 aluminium powder performance comparison
Wherein Wei Qiao aluminium powder transformation efficiency 98%, but the former grain fineness number of aluminium powder is partially thick, difficult levigate; A kind of aluminium powder fineness in Australia is very thin, but transformation efficiency 94% is on the low side, slurry poor performance.By considering performance and the technology controlling and process difficulty or ease situation of various aluminium powders, the present invention adopts from burning aluminium powder and Shandong Aluminum Co., Ltd. aluminium powder as raw material.
First group of processing parameter of intermittent type ball milling of step of the present invention (2) is: physical dimension 3000*4500mm, rotating speed 13r/min, Ball-milling Time 15 hours, slurry water is divided and is controlled at 40-45%, after slurry fineness D90≤10 μ m(slurry fineness is qualified, after 40 mesh sieves, removes little ballstone and do not grind thin thick material); Horizontal sand mill processing parameter: physical dimension 1600*1000*1700mm, cylinder barrel volume 30L, the rotating speed requiring in speed of mainshaft 0-1500r/min(the present invention is 1200-1300r/min), production capacity 0.5-1.2T/h, after slurry fineness D90≤2.5 μ m(slurry fineness is qualified, after 180 mesh sieves, removes little ballstone and do not grind thin thick material); Second group of processing parameter of intermittent type ball milling is: physical dimension 3000*4500mm, and rotating speed 13r/min, Ball-milling Time 15 hours, after 180 mesh sieves, removes little ballstone and does not grind thin thick material after slurry fineness D90≤2.2 μ m(slurry fineness is qualified).Formulation material is prepared into thicker, to have mobility mud by the intermittent type ball milling object in early stage; Then entering horizontal sand mill ball milling can obtain than stirring the mud that mill is thinner, mud grain surface is sufficiently oily equally, have a lot of defects, in sintering process, crystal grain is in conjunction with fine and close not, and the product of direct production occurs defects i.e.cracks in long-time mechanical milling process during as grinding medium; In order to repair grain surface, homogenizing fineness of grain ball milling in intermittent ball mill again, to improve dry grinding ball performance.
The Centrafugal spray drying tower top temperature of step of the present invention (3) is 450-750 DEG C, end opening temperature 80-120 DEG C, powder moisture controlled is at 1-3%, and the present invention crosses dual sieve 40-140 order and obtains the defect problem that intermediate particle solution particle causes, and work in-process breakage rate declines 2% simultaneously; The pelletizing of pressure-type spray tower belongs to hollow or apple shape, has a large amount of UNICOM's gas hole defects in work in-process inside, and discomfort is fit to do dry grinding ball.
The hyperthermia tunnel Kiln top layer dress of step of the present invention (5) is from burning aluminum oxide powder, and bottom dress work in-process ball base, takes low temperature to be incubated for a long time firing process.Its object reaches aluminium powder aspect and reaches that former crystalline substance is little, transformation efficiency is high, transformation efficiency is even; Product aspect reaches the object of abundant exhaust, structure grain refining, densification.
Described flint clay grog is light-burned grog (temperature is 900-1100 DEG C), and principal feature is: foreign matter content is few, sintering easily generates mullite phase, improves ultimate compression strength; Kaolin contributes to work in-process moulding.
The present invention adds the composite sintering agent being made up of diopside, talcum and rhombspar in formula, reaches the object that reduces firing temperature by solid state sintering.
The present invention compared with prior art, has following outstanding feature:
(1) aluminium powder that certainly burns of the present invention has 98% transformation efficiency, D90 < 3 μ m, main feature obtains evenly by adding composite mineralizer, unified aluminum oxide powder, and this aluminium powder is that sheet structure and columnar structure mix, wherein column accounts for 60 ± 5%, sheet 40 ± 5%; By certainly burning the commercially available aluminium powder rational proportion of aluminium powder and outsourcing ball milling, avoid using expensive raw material to reach the object that improves resistance to impact shock.
(2) the present invention is by the special balls grinding process of three ball millings, adjusts the object that the microtexture of alumina dry abrading-ball reaches Optimal performance, reduces costs from starting with by improving the factor such as sand mill grinding efficiency, finishing slurry grain surface defect, reaching.
(3) powder process operation of the present invention is creationary has added a double-deck roto-sifter, obtains 40-140 object powder particle compacting work in-process, and work in-process breakage rate declines 2%, and in the situation that other conditions are identical, the finished product of system improves 5% through Performance Detection resistance to compression.
(4) aluminum oxide dry grinding porcelain ball of the present invention has the features such as abrasion are low, intensity is high, density is high, subsurface defect is few, shock resistance is good (aluminum oxide dry grinding porcelain ball equivalent abrasion≤0.015 ‰, secondary abrasion≤0.003 ‰, reach>=350KN/ of φ 30 resistance to compressions, reach>=3.70g/cm of density
3, mill rear surface compact structure zero defect), excellent combination property, meets various industries completely to the requirement of dry grinding mass of medium.
Brief description of the drawings
Fig. 1 is traditional technology route, and 1a, 1b and 1c represent 3 kinds of different operational paths; How above three kinds of traditional technology routes have only been considered, problem levigate slurry, not consider more careful slurry crystal grain appearance problem, also just there is no corresponding solution; All take extensive technological measure in the stage of dusting, do not take into full account the impact of powder particle level (crossing thick or meticulous) on product performance simultaneously.
Fig. 2 is operational path of the present invention; It takes the horizontal sand mill ball milling slurry stage of difficult mill that grinding efficiency is higher, first group of object of intermittent ball mill worn into slurry by raw material ball and facilitated sand mill ball milling, second group of object of intermittent ball mill is to revise slurry grain surface defect, so that more easy-sintering obtains fine and close crystalline structure; Particle is optimized and is chosen by double-deck roto-sifter in the stage of dusting, so that particle is more tightly packed, acceleration of sintering, reduces subsurface defect simultaneously.
Fig. 3 is commercially available mountain aluminium (being produced by the Shandong Aluminium Industry Co., Ltd) electromicroscopic photograph that the present invention uses, and this aluminium powder structure is sheet as can be seen from the picture, and crystal grain is below 3.5 microns;
Fig. 4 is Wei Qiao aluminium powder electromicroscopic photograph, and this aluminium powder fineness is inhomogeneous as can be seen from the picture, and crystal grain maximum is 5.4 microns of left and right;
Fig. 5 is Australia's powder electromicroscopic photograph, and this aluminium powder is columnar structure as can be seen from the picture, and crystal grain is 2.4 microns of left and right;
Fig. 6 is that this aluminium powder crystal formation is sheet and column mixed type as can be seen from the picture from burning aluminium powder electromicroscopic photograph, and fineness of grain is below 3 microns.
Embodiment
Embodiment is only described further the present invention, but is not limited only to this.As shown in table 1 from the performance index of burning aluminum oxide powder and outsourcing commercial alumina powder, the chemical composition of other raw materials is in table 2.
The chemical constitution of other raw materials of table 2 and weight part
Embodiment 1:
(1) raw material and weight part
Major ingredient: certainly burn 52 parts of aluminum oxide powders, 37 parts, commercial alumina powder, 3 parts of kaolin, 3 parts, flint clay grog;
Complex sintering aids: 2 parts of diopsides, 1.5 parts, talcum, 1.5 parts of rhombspars;
(2) will be from burning aluminum oxide powder, commercial alumina powder, kaolin, flint clay grog and complex sintering aids are put into intermittent ball mill ball milling 15h, slurry fineness is 10 μ m, moisture controlled is 43%, adopting alumina balls masonry is grinding medium, material in mass ratio: ball: water=1:3:0.8, cross after 40 mesh sieves, pump slurry into ball milling in horizontal sand mill with ram pump, speed of mainshaft 1200r/min, slurry fineness is 2.5 μ m, grinding medium adopts wear-resisting alumina microballon, slurry: ball=1:4 in mass ratio, cross 180 mesh sieves and put into transfer stock tank, ball milling 15h in pumping slurry into intermittent ball mill with ram pump, slurry fineness is 2.2 μ m, employing alumina balls are grinding medium, slurry: ball=1:3 in mass ratio, cross 180 mesh sieves, after electromagnetism deironing, obtain ceramic mud.
(3) ceramic mud step (2) being obtained adopts centrifugal mist projection granulating tower dry, crosses 40 orders and 140 mesh sieves in double-deck roto-sifter, obtains the pelletizing between 40-140 order, and tower top temperature is 550 DEG C, 90 DEG C of end opening temperature, and pelletizing moisture controlled is 3%.
(4) ceramic prilling powder step (3) being obtained is pressed into work in-process ball base in automatic nodulizer.
(5) step (4) the work in-process ball base that obtains is adopted to the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1400～1410 DEG C with the rate of heating of 8～25 DEG C/min from room temperature burns till, insulation 12h, then lower the temperature with the speed of cooling of 15～30 DEG C/min, aluminum oxide dry grinding porcelain ball obtained.
Product performance are in table 3.
Embodiment 2:
(1) raw material and weight part
Major ingredient: certainly burn 60 parts of aluminum oxide powders, 30 parts, commercial alumina powder, 3 parts of kaolin, 3 parts, flint clay grog;
Complex sintering aids: 2 parts of diopsides, 1.5 parts, talcum, 1.5 parts of rhombspars;
(2) will be from burning aluminum oxide powder, commercial alumina powder, kaolin, flint clay grog and complex sintering aids are put into intermittent ball mill ball milling 15h, slurry fineness is 9 μ m, moisture controlled is 43%, adopting alumina balls masonry is grinding medium, material in mass ratio: ball: water=1:2.8:0.8, cross after 40 mesh sieves, pump slurry into ball milling in horizontal sand mill with ram pump, the speed of mainshaft is 1250r/min, slurry fineness is 2.3 μ m, grinding medium adopts wear-resisting alumina microballon, slurry: ball=1:4 in mass ratio, cross 180 mesh sieves and put into transfer stock tank, ball milling 15h in pumping slurry into intermittent ball mill with ram pump, slurry fineness is 2.1 μ m, employing alumina balls are grinding medium, slurry: ball=1:3 in mass ratio, cross 180 mesh sieves, after electromagnetism deironing, obtain ceramic mud.
(3) ceramic mud step (2) being obtained adopts centrifugal mist projection granulating tower dry, crosses 40 orders and 140 mesh sieves in double-deck roto-sifter, obtains the pelletizing between 40-140 order, and tower top temperature is 550 DEG C, 95 DEG C of end opening temperature, and pelletizing moisture controlled is 2%.
(4) ceramic prilling powder step (3) being obtained is pressed into work in-process ball base in automatic nodulizer.
(5) step (4) the work in-process ball base that obtains is adopted to the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1400～1430 DEG C with the rate of heating of 8～25 DEG C/min from room temperature burns till, insulation 10h, then lower the temperature with the speed of cooling of 15～30 DEG C/min, aluminum oxide dry grinding porcelain ball obtained.
Product performance are in table 3.
Embodiment 3:
(1) raw material and weight part
Major ingredient: certainly burn 54 parts of aluminum oxide powders, 34 parts of aluminum oxide powders, 4 parts of kaolin, 2 parts of flint claies;
Complex sintering aids: 3 parts of diopsides, 2 parts, talcum, 1 part of rhombspar;
(2) will be from burning aluminum oxide powder, commercial alumina powder, kaolin, flint clay and complex sintering aids are put into intermittent ball mill ball milling 15h, slurry fineness is 8 μ m, moisture controlled is 43%, adopting alumina balls masonry is grinding medium, material in mass ratio: ball: water=1:2.5:0.8, cross after 40 mesh sieves, pump slurry into ball milling in horizontal sand mill with ram pump, speed of mainshaft 1230r/min, slurry fineness is 2.3 μ m, grinding medium adopts wear-resisting alumina microballon, slurry: ball=1:4 in mass ratio, cross 180 mesh sieves and put into transfer stock tank, ball milling 15h in pumping slurry into intermittent ball mill with ram pump, slurry fineness is 1.9 μ m, employing alumina balls are grinding medium, slurry: ball=1:3 in mass ratio, cross 180 mesh sieves, after electromagnetism deironing, obtain ceramic mud.
(3) ceramic mud step (2) being obtained adopts centrifugal mist projection granulating tower dry, in double-deck roto-sifter, cross 40 orders and 140 mesh sieves, obtain the pelletizing between 40-140 order, tower top temperature is 540 DEG C, 100 DEG C of end opening temperature, pelletizing moisture controlled is 1%.
(4) ceramic prilling powder step (3) being obtained is pressed into work in-process ball base in automatic nodulizer.
(5) step (4) the work in-process ball base that obtains is adopted to the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1405～1415 DEG C with the rate of heating of 8～25 DEG C/min from room temperature burns till, insulation 12h, then lower the temperature with the speed of cooling of 15～30 DEG C/min, aluminum oxide dry grinding porcelain ball obtained.Product performance are in table 3.
The performance index of table 3 embodiment 1-3 product
| ? | Equivalent abrasion ‰ | Secondary abrasion ‰ | Proportion g/cm 3 | Resistance to compression KN | Outward appearance after mill |
| Embodiment 1 | 0.012 | 0.002 | 3.72 | 400 | Zero defect |
| Embodiment 2 | 0.015 | 0.003 | 3.73 | 360 | Zero defect |
| Embodiment 3 | 0.011 | 0.003 | 3.78 | 390 | Zero defect |
Claims (7)
1. a dry ball milling alumina ball preparation method, is characterized in that,
(1) raw material and weight part
Major ingredient: certainly burn 50～70 parts of aluminum oxide powders, commercial alumina powder 30-40 part, kaolin 3-5 part, flint clay grog 2-3 part;
Complex sintering aids: diopside 0.5-5 part, talcum 0.5-5 part, rhombspar 0.5-5 part;
The described transformation efficiency > 98% from burning aluminum oxide powder, former crystal grain footpath D90 < 3 μ m, belong to column and sheet and mix crystalline structure, and wherein column accounts for 60 ± 5%, sheet 40 ± 5%;
The transformation efficiency > 98% of described commercial alumina powder, former crystal grain footpath D90 < 3.5 μ m, are sheet structure;
(2) will add together with weighing respectively with complex sintering aids and in intermittent ball mill, carry out wet ball grinding from burning aluminum oxide powder, commercial alumina powder, kaolin, flint clay grog, slurry water be divided and is controlled at 40-45%; Be milled to and cross 40 mesh sieves after the μ m of slurry fineness D90≤10, slurry is pumped into ball milling in horizontal sand mill with ram pump, be milled to and cross 180 mesh sieves after the μ m of slurry fineness D90≤2.5 and put into transfer stock tank; With ram pump, slurry is pumped into ball milling in intermittent ball mill again, be milled to slurry fineness D90≤2.2 μ m and cross 180 mesh sieves, after electromagnetism deironing, obtain ceramic mud;
(3) ceramic mud step (2) being obtained adopts centrifugal mist projection granulating tower dry, crosses 40 orders and 140 mesh sieves in double-deck roto-sifter, obtains the ceramic prilling powder between 40-140 order;
(4) ceramic prilling powder step (3) being obtained is pressed into work in-process ball base in automatic nodulizer;
(5) step (4) gained work in-process ball base is adopted to the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1400～1430 DEG C with the rate of heating of 8～25 DEG C/min from room temperature burns till, insulation 8-12h, then lower the temperature with the speed of cooling of 15～30 DEG C/min, dry ball milling alumina ball obtained.
2. a kind of dry ball milling alumina ball preparation method as claimed in claim 1, it is characterized in that, describedly from burning the preparation method of aluminum oxide powder be: the composite mineralizer that gamma-alumina powder adds its quality 2-3 ‰ packs in silicon carbide sagger to be fired and form at the hyperthermia tunnel Kiln top layer of firing work in-process ball base, firing temperature 1400-1430 DEG C; The component of described composite mineralizer and weight ratio thereof be, aluminum fluoride: boric acid: ammonium chloride=1:0.7:0.5.
3. a kind of dry ball milling alumina ball preparation method as claimed in claim 1, it is characterized in that, when described the 1st employing intermittent ball mill ball milling, adopting alumina balls masonry is grinding medium, material in mass ratio: ball: water=1:2-3:0.8, ball mill physical dimension 3000*4500mm, drum's speed of rotation 13r/min, Ball-milling Time 15 hours.
4. a kind of dry ball milling alumina ball preparation method as claimed in claim 1, is characterized in that, described horizontal sand mill grinding medium adopts wear-resisting alumina microballon, in mass ratio slurry: ball=1:4, speed of mainshaft 1200-1500r/min.
5. a kind of dry ball milling alumina ball preparation method as claimed in claim 4, is characterized in that, described horizontal sand mill physical dimension 1600*1000*1700mm, cylinder barrel volume 30L, production capacity 0.5-1.2T/h.
6. a kind of dry ball milling alumina ball preparation method as claimed in claim 1, it is characterized in that, when described the 2nd employing intermittent ball mill ball milling, employing alumina balls are grinding medium, slurry: ball=1:3 in mass ratio, ball mill physical dimension 3000*4500mm, drum's speed of rotation 13r/min, Ball-milling Time 15 hours.
7. a kind of dry ball milling alumina ball preparation method as claimed in claim 1, is characterized in that, described Centrafugal spray drying tower top temperature is 450-750 DEG C, end opening temperature 80-120 DEG C, and powder moisture controlled is at 1-3%.
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