CN103274674A - 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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- CN103274674A CN103274674A CN2013102398894A CN201310239889A CN103274674A CN 103274674 A CN103274674 A CN 103274674A CN 2013102398894 A CN2013102398894 A CN 2013102398894A CN 201310239889 A CN201310239889 A CN 201310239889A CN 103274674 A CN103274674 A CN 103274674A
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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 the high speed development of science and technology, new challenge has been proposed pottery.Alumina ball is widely used in industries such as construction sanitary ceramic, industrial ceramics, electronic ceramics, high-grade refractory materials, special cement, non-metallic minerals and coating, paint because having characteristics such as hardness height, density be big, wear-resisting, corrosion-resistant 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 alumina-ceramic ball production method.Be specially: take by weighing ceramic powder by following weight ratio: the 89.5%-94.5% alpha-aluminium oxide powder, 3%-6% Suzhou soil, the 1.5%-2% rhombspar, 0.5%-1.5% burns talcum, the 0.5-1% coarse whiting is by stirring abrading-ball mill, rolling moulding, burn till, polishing and obtain the alumina-ceramic ball.The alpha-aluminium oxide powder transformation efficiency 96% that this invention is adopted, D90=3.76 μ m through the rolling moulding, burns till under 1490 ℃ of temperature of minimum temperature, can satisfy the requirement of wet ball grinding medium.But because the aluminium powder transformation efficiency that uses is on the low side, wherein the contraction meeting that the crystalline phase conversion produces in sintering process of 4% gamma oxidation aluminium powder causes product internal structure variation preparing inner a large amount of UNICOM's pore that produces; The porcelain ball shock resistance of the moulding of rolling simultaneously is poor, and is not suitable as the grinding medium of dry method; And the slurry crystal grain behind the simple stirring abrading-ball mill belongs to irregularly shaped, and its surface produces a large amount of sharp keen corner angle, hinders sintering and compact structureization, thus this patent burn till minimum temperature also at 1490 ℃, cause the increase of manufacturing cost and kiln furnitures cost.
Alumina ball is used as the grinding medium of dry ball milling technology on the basis that wet grinding medium requires, and except grinding media wear is had the strict demand, most importantly the inner necessary defective of grinding medium is few, and shock resistance is good.Demand at existing market, many patent descriptions have been arranged in alumina-ceramic, added materials such as silicon carbide, rare earth, zirconium white, by the toughness reinforcing effect that reaches high impact properties of crystal grain, wherein adding expensive starting material and complicated technology increases too much production cost, be not suitable for big production application, the bad product subsurface defect that will directly cause of add-on control simultaneously increases, 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.This method is main raw material to burn alpha-aluminium oxide powder certainly, be equipped with the alpha-aluminium oxide powder of outsourcing Shandong Aluminum, adopting brand-new production technique is the basis, under lower raw materials cost and manufacturing cost, prepare product and have low abrasion, high strength, high-density, characteristics such as shock resistance is good are suitable for various industries fully to the specification of quality of dry grinding medium, simultaneously as the 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: burn 50～70 parts of aluminum oxide powders, commercial alumina powder 30-40 part certainly, 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 burn certainly aluminum oxide powder, commercial alumina powder, kaolin, flint clay grog and complex sintering aids respectively weighing add together in the intermittent ball mill that (adopting the alumina balls masonry is grinding medium, and by the mass ratio material: ball: water=1:2-3:0.8) carries out wet ball grinding (the slurry moisture controlled is at 40-45%); 40 mesh sieves are crossed in the qualified back of fineness, and (this step does not need to add water to pump slurry into ball milling in the horizontal sand mill with ram pump; Grinding medium adopts the wear-resisting alumina microballon, presses the mass ratio slurry: ball=1:4, speed of mainshaft 1200-1500r/min), the qualified back of fineness is crossed 180 mesh sieves and is put into the transfer stock tank; (the employing alumina balls are grinding medium, press the mass ratio slurry: ball=1:3), 180 mesh sieves are crossed in the qualified back of fineness, obtain ceramic mud after the electromagnetism deironing to pump slurry into ball milling in the intermittent ball mill with ram pump again;
(3) ceramic mud that step (2) is obtained adopts centrifugal mist projection granulating tower drying, crosses 40 orders and 140 mesh sieves in double-deck roto-sifter, obtains the ceramic prilling powder between the 40-140 order;
(4) ceramic prilling powder that step (3) is obtained is being pressed into work in-process ball base in the nodulizer automatically;
(5) the resultant work in-process ball of step (4) base is adopted the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1400～1430 ℃ with the rate of heating of 8～25 ℃/min from room temperature burns till, insulation 8-12h, with the speed of cooling cooling of 15～30 ℃/min, obtain the dry ball milling alumina ball again.
Fig. 1-Fig. 2 is seen in traditional technology and technical process of the present invention contrast.
Certainly the preparation method who burns aluminum oxide powder of step of the present invention (1) is: the 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) is packed in the silicon carbide sagger to fire at the hyperthermia tunnel Kiln top layer of firing work in-process ball base and is formed firing temperature 1400-1430 ℃.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%(sees 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 the sheet structure (see figure 3).Use the little aluminium powder in transformation efficiency higher, former crystal grain footpath can reduce the subsurface defect that causes in the contraction process, improve grinding efficiency simultaneously.Various aluminium powder performance comparison see Table 1, and surface structure is seen Fig. 3-6.
Table 1 aluminium powder performance comparison
Wei Qiao aluminium powder transformation efficiency 98% wherein, but the former grain fineness number of aluminium powder is thick partially, difficult levigate; A kind of aluminium powder fineness in Australia is very thin, but transformation efficiency 94% is on the low side, the slurry poor performance.By performance and the technology controlling and process difficulty or ease situation of taking all factors into consideration various aluminium powders, the present invention adopts from burning aluminium powder and Shandong Aluminum aluminium powder as raw material.
First group of processing parameter of the intermittent type ball milling of step of the present invention (2) is: physical dimension 3000*4500mm, rotating speed 13r/min, 15 hours ball milling time, the slurry moisture controlled is at 40-45%, the qualified back of slurry fineness D90≤10 μ m(slurry fineness is removed little ballstone and is not ground thin thick material after 40 mesh sieves); Horizontal sand mill processing parameter: physical dimension 1600*1000*1700mm, cylinder barrel volume 30L, the rotating speed that requires among speed of mainshaft 0-1500r/min(the present invention is 1200-1300r/min), production capacity 0.5-1.2T/h, the qualified back of slurry fineness D90≤2.5 μ m(slurry fineness is removed little ballstone and is not ground thin thick material after 180 mesh sieves); Second group of processing parameter of intermittent type ball milling is: physical dimension 3000*4500mm, and rotating speed 13r/min, 15 hours ball milling time, the qualified back of slurry fineness D90≤2.2 μ m(slurry fineness is removed little ballstone and is not ground thin thick material after 180 mesh sieves).The intermittent type ball milling purpose in early stage is prepared into mud thicker, that have flowability with formulation material; Entering the horizontal sand mill ball milling then can obtain than stirring the thinner mud of mill, the mud grain surface is not sufficiently oily equally, have a lot of defectives, crystal grain is in conjunction with fine and close inadequately in sintering process, and defectives such as crackle appear during as grinding medium in the product of direct production in the long-time mechanical milling process; In order to repair grain surface, homogenizing fineness of grain ball milling in intermittent ball mill again, in order to improve dry grinding ball performance.
The centrifugal spraying drying cat head temperature of step of the present invention (3) is 450-750 ℃, 80-120 ℃ of end opening temperature, the 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 the work in-process breakage rate descends 2% simultaneously; The granulation powder of pressure-type spray tower belongs to hollow or the apple shape, has a large amount of UNICOM's gas hole defects in work in-process inside, and discomfort is fit to do the 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 firing process for a long time.Its purpose reaches the aluminium powder aspect and reaches that former crystalline substance is little, transformation efficiency is high, transformation efficiency is even; The product aspect reaches the purpose of abundant exhaust, structure grain refining, densification.
Described flint clay grog is light-burned grog (temperature is 900-1100 ℃), and principal feature is: foreign matter content is few, sintering easily generates the mullite phase, improves ultimate compression strength; Kaolin helps the work in-process moulding.
The present invention adds the composite sintering agent that is made of diopside, talcum and rhombspar in prescription, reach the purpose that reduces firing temperature by solid state sintering.
The present invention has following outstanding feature compared with prior art:
It is (1) of the present invention that burning aluminium powder has 98% transformation efficiency certainly, D90＜3 μ m, and main characteristics obtain evenly by adding composite mineralizer, unified aluminum oxide powder, and this aluminium powder is that sheet structure and columnar structure mix, and wherein column accounts for 60 ± 5%, sheet 40 ± 5%; By burning the commercially available aluminium powder rational proportion of aluminium powder and outsourcing ball milling certainly, avoided using expensive raw material to reach the purpose that improves resistance to impact shock.
(2) the present invention, reaches the microtexture of adjusting the alumina dry abrading-ball and reaches the purpose of optimizing performance, reducing cost from starting with by improving factors such as sand mill grinding efficiency, finishing slurry grain surface defective by the special ball-milling technology of three ball millings.
(3) powder process operation of the present invention is creationary has added a double-deck roto-sifter, obtains 40-140 purpose powder particle compacting work in-process, and the work in-process breakage rate descends 2%, and under the identical situation of other conditions, the finished product of system improves 5% through the Performance Detection resistance to compression.
(4) aluminum oxide dry grinding porcelain ball of the present invention has characteristics 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 ‰, φ 30 resistance to compressions reach 〉=350KN/, and density reaches 〉=3.70g/cm
3, mill rear surface compact structure zero defect), excellent combination property satisfies various industries fully to the requirement of dry grinding mass of medium.
Description of drawings
Fig. 1 is the traditional technology route, and 1a, 1b represent 3 kinds of different operational paths with 1c; More than three kinds of traditional technology routes how only to have considered the levigate problem of slurry is not considered more careful slurry crystal grain appearance problem also just do not have corresponding solution; Simultaneously all take extensive technological measure in the stage of dusting, do not take into full account powder particle level (crossing thick or meticulous) to the influence of product performance.
Fig. 2 is operational path of the present invention; It takes the higher horizontal sand mill ball milling slurry of grinding efficiency stage of difficult mill, first group of purpose of intermittent ball mill worn into slurry with raw material ball and made things convenient for the sand mill ball milling, second group of purpose of intermittent ball mill is to revise slurry grain surface defective, so that more easy-sintering obtains fine and close crystalline structure; Particle is optimized by double-deck roto-sifter in the stage of dusting simultaneously and chooses, so that particle is more tightly packed, acceleration of sintering reduces subsurface defect.
The commercially available mountain aluminium that Fig. 3 uses for the present invention (being produced by Shandong Aluminium Industry Co., Ltd) electromicroscopic photograph, this aluminium powder structure is sheet as can be seen from the picture, 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 the crystal grain maximum is about 5.4 microns;
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 about 2.4 microns;
Fig. 6 is for burning the aluminium powder electromicroscopic photograph certainly, and this aluminium powder crystal formation is sheet and column mixed type as can be seen from the picture, and fineness of grain is below 3 microns.
Embodiment
Embodiment is, and the present invention only is described further, 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 ingredients of other raw materials sees 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: burn 52 parts of aluminum oxide powders certainly, 37 parts in commercial alumina powder, 3 parts of kaolin, 3 parts in flint clay grog;
Complex sintering aids: 2 parts of diopsides, 1.5 parts in talcum, 1.5 parts of rhombspars;
(2) will burn aluminum oxide powder certainly, the commercial alumina powder, kaolin, flint clay grog and complex sintering aids are put into intermittent ball mill ball milling 15h, the slurry fineness is 10 μ m, moisture controlled is 43%, adopting the alumina balls masonry is grinding medium, press the mass ratio material: ball: water=1:3:0.8, after crossing 40 mesh sieves, pump slurry into ball milling in the horizontal sand mill with ram pump, speed of mainshaft 1200r/min, the slurry fineness is 2.5 μ m, grinding medium adopts the wear-resisting alumina microballon, press mass ratio slurry: ball=1:4, cross 180 mesh sieves and put into the transfer stock tank, pumping slurry into ball milling 15h in the intermittent ball mill with ram pump, the slurry fineness is 2.2 μ m, the employing alumina balls are grinding medium, press mass ratio slurry: ball=1:3, cross 180 mesh sieves, obtain ceramic mud after the electromagnetism deironing.
(3) ceramic mud that step (2) is obtained adopts centrifugal mist projection granulating tower drying, crosses 40 orders and 140 mesh sieves in double-deck roto-sifter, obtains the granulation powder between the 40-140 order, and tower top temperature is 550 ℃, 90 ℃ of end opening temperature, and granulation powder moisture controlled is 3%.
(4) ceramic prilling powder that step (3) is obtained is being pressed into work in-process ball base in the nodulizer automatically.
(5) the resultant work in-process ball of step (4) base is adopted the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1400～1410 ℃ with the rate of heating of 8～25 ℃/min from room temperature burns till, insulation 12h again with the speed of cooling cooling of 15～30 ℃/min, obtains aluminum oxide dry grinding porcelain ball.
Product performance see Table 3.
Embodiment 2:
(1) raw material and weight part
Major ingredient: burn 60 parts of aluminum oxide powders certainly, 30 parts in commercial alumina powder, 3 parts of kaolin, 3 parts in flint clay grog;
Complex sintering aids: 2 parts of diopsides, 1.5 parts in talcum, 1.5 parts of rhombspars;
(2) will burn aluminum oxide powder certainly, the commercial alumina powder, kaolin, flint clay grog and complex sintering aids are put into intermittent ball mill ball milling 15h, the slurry fineness is 9 μ m, moisture controlled is 43%, adopting the alumina balls masonry is grinding medium, press the mass ratio material: ball: water=1:2.8:0.8, after crossing 40 mesh sieves, pump slurry into ball milling in the horizontal sand mill with ram pump, the speed of mainshaft is 1250r/min, and the slurry fineness is 2.3 μ m, and grinding medium adopts the wear-resisting alumina microballon, press mass ratio slurry: ball=1:4, cross 180 mesh sieves and put into the transfer stock tank, pumping slurry into ball milling 15h in the intermittent ball mill with ram pump, the slurry fineness is 2.1 μ m, the employing alumina balls are grinding medium, press mass ratio slurry: ball=1:3, cross 180 mesh sieves, obtain ceramic mud after the electromagnetism deironing.
(3) ceramic mud that step (2) is obtained adopts centrifugal mist projection granulating tower drying, crosses 40 orders and 140 mesh sieves in double-deck roto-sifter, obtains the granulation powder between the 40-140 order, and tower top temperature is 550 ℃, 95 ℃ of end opening temperature, and granulation powder moisture controlled is 2%.
(4) ceramic prilling powder that step (3) is obtained is being pressed into work in-process ball base in the nodulizer automatically.
(5) the resultant work in-process ball of step (4) base is adopted the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1400～1430 ℃ with the rate of heating of 8～25 ℃/min from room temperature burns till, insulation 10h again with the speed of cooling cooling of 15～30 ℃/min, obtains aluminum oxide dry grinding porcelain ball.
Product performance see Table 3.
Embodiment 3:
(1) raw material and weight part
Major ingredient: burn 54 parts of aluminum oxide powders certainly, 34 parts of aluminum oxide powders, 4 parts of kaolin, 2 parts of flint claies;
Complex sintering aids: 3 parts of diopsides, 2 parts in talcum, 1 part of rhombspar;
(2) will burn aluminum oxide powder certainly, the commercial alumina powder, kaolin, flint clay and complex sintering aids are put into intermittent ball mill ball milling 15h, the slurry fineness is 8 μ m, moisture controlled is 43%, adopting the alumina balls masonry is grinding medium, press the mass ratio material: ball: water=1:2.5:0.8, after crossing 40 mesh sieves, pump slurry into ball milling in the horizontal sand mill with ram pump, speed of mainshaft 1230r/min, the slurry fineness is 2.3 μ m, grinding medium adopts the wear-resisting alumina microballon, press mass ratio slurry: ball=1:4, cross 180 mesh sieves and put into the transfer stock tank, pumping slurry into ball milling 15h in the intermittent ball mill with ram pump, the slurry fineness is 1.9 μ m, the employing alumina balls are grinding medium, press mass ratio slurry: ball=1:3, cross 180 mesh sieves, obtain ceramic mud after the electromagnetism deironing.
(3) ceramic mud that step (2) is obtained adopts centrifugal mist projection granulating tower drying, cross 40 orders and 140 mesh sieves in double-deck roto-sifter, obtain the granulation powder between the 40-140 order, tower top temperature is 540 ℃, 100 ℃ of end opening temperature, granulation powder moisture controlled is 1%.
(4) ceramic prilling powder that step (3) is obtained is being pressed into work in-process ball base in the nodulizer automatically.
(5) the resultant work in-process ball of step (4) base is adopted the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1405～1415 ℃ with the rate of heating of 8～25 ℃/min from room temperature burns till, insulation 12h again with the speed of cooling cooling of 15～30 ℃/min, obtains aluminum oxide dry grinding porcelain ball.Product performance see Table 3.
The performance index of table 3 embodiment 1-3 product
| ? | Equivalent abrasion ‰ | Secondary abrasion ‰ | Proportion g/cm 3 | Resistance to compression KN | Mill back outward appearance |
| 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 (8)
1. a dry ball milling alumina ball preparation method is characterized in that,
(1) raw material and weight part
Major ingredient: burn 50～70 parts of aluminum oxide powders, commercial alumina powder 30-40 part certainly, 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;
Described from transformation efficiency＞98% that burns 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%;
(2) will burn certainly aluminum oxide powder, commercial alumina powder, kaolin, flint clay grog and complex sintering aids respectively weighing add together and carry out wet ball grinding in the intermittent ball mill, the slurry moisture controlled is at 40-45%; Ball milling is crossed 40 mesh sieves to slurry fineness D90≤10 μ m, with ram pump slurry is pumped into ball milling in the horizontal sand mill, and ball milling is crossed 180 mesh sieves to slurry fineness D90≤2.5 μ m and put into the transfer stock tank; With ram pump slurry is pumped into ball milling in the intermittent ball mill again, ball milling is crossed 180 mesh sieves, is obtained ceramic mud after the electromagnetism deironing to slurry fineness D90≤2.2 μ m;
(3) ceramic mud that step (2) is obtained adopts centrifugal mist projection granulating tower drying, crosses 40 orders and 140 mesh sieves in double-deck roto-sifter, obtains the ceramic prilling powder between the 40-140 order;
(4) ceramic prilling powder that step (3) is obtained is being pressed into work in-process ball base in the nodulizer automatically;
(5) step (4) gained work in-process ball base is adopted the slow firing technique of low temperature at hyperthermia tunnel Kiln, being warming up to 1400～1430 ℃ with the rate of heating of 8～25 ℃/min from room temperature burns till, insulation 8-12h with the speed of cooling cooling of 15～30 ℃/min, obtains the dry ball milling alumina ball again.
2. a kind of dry ball milling alumina ball preparation method as claimed in claim 1 is characterized in that, the transformation efficiency of described commercial alumina powder＞98%, and former crystal grain footpath D90＜3.5 μ m are sheet structure.
3. a kind of dry ball milling alumina ball preparation method as claimed in claim 1 or 2, it is characterized in that, describedly from the preparation method who burns aluminum oxide powder be: the composite mineralizer that the gamma-alumina powder adds its quality 2-3 ‰ is packed in the silicon carbide sagger to fire at the hyperthermia tunnel Kiln top layer of firing work in-process ball base and is formed firing temperature 1400-1430 ℃; The component of described composite mineralizer and weight ratio thereof are aluminum fluoride: boric acid: ammonium chloride=1:0.7:0.5.
4. a kind of dry ball milling alumina ball preparation method as claimed in claim 1 or 2, it is characterized in that, described when adopting the intermittent ball mill ball milling the 1st time, adopting the alumina balls masonry is grinding medium, press the mass ratio material: ball: water=1:2-3:0.8, ball mill physical dimension 3000*4500mm, drum's speed of rotation 13r/min, 15 hours ball milling time.
5. a kind of dry ball milling alumina ball preparation method as claimed in claim 1 or 2 is characterized in that, described horizontal sand mill grinding medium adopts the wear-resisting alumina microballon, presses the mass ratio slurry: ball=1:4, speed of mainshaft 1200-1500r/min.
6. a kind of dry ball milling alumina ball preparation method as claimed in claim 5 is characterized in that, described horizontal sand mill physical dimension 1600*1000*1700mm, cylinder barrel volume 30L, production capacity 0.5-1.2T/h.
7. a kind of dry ball milling alumina ball preparation method as claimed in claim 1 or 2, it is characterized in that, described when adopting the intermittent ball mill ball milling the 2nd time, the employing alumina balls are grinding medium, press mass ratio slurry: ball=1:3, ball mill physical dimension 3000*4500mm, drum's speed of rotation 13r/min, 15 hours ball milling time.
8. a kind of dry ball milling alumina ball preparation method as claimed in claim 1 or 2 is characterized in that, described centrifugal spraying drying cat head temperature is 450-750 ℃, 80-120 ℃ of end opening temperature, and the powder moisture controlled is at 1-3%.
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