CN105924140B - A kind of method that rolling molding prepares high resistance to compression aluminum oxide milling media - Google Patents
A kind of method that rolling molding prepares high resistance to compression aluminum oxide milling media Download PDFInfo
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Abstract
The invention discloses a kind of rollings to be molded the method for preparing high resistance to compression aluminum oxide milling media, is particularly suitable for preparing the dry grinding ball for 13mm~30mm that dry grinding field uses.It is A pelletizings that the present invention, which is spray-dried directly obtains conventional alumina pelletizing first,；The ultra-fine dust collection powder collected from dust-precipitator when conventional pelletizing A is B pelletizings；By adding a large amount of PVA, and improves spray drying temperature and obtain C pelletizings；By three, rolling, sieving in sugar coating machine by a certain percentage, is made the semi-finished product ball base of 10 20mm of diameter；Semi-finished product ball base is rolled onto always 13 30mm target semi-finished product using crushed material A again；It finally dries, be fired into finished product.The mode that this method is compounded by using the pelletizing of different characteristics, similar ball base when obtaining with isostatic pressing make wherein to contain certain stomata, reduce the crackle that thermal shock generates when being burnt into cooling, and play the role of activeness and quietness.
Description
Technical field
The present invention relates to a kind of rollings to be molded the method for preparing high resistance to compression aluminum oxide milling media, belongs to ceramic material technology
Field.
Background technology
Aluminum oxide milling media is lacked from impact between material and aluminium oxide ballstone due to directly impacting in process of lapping
Buffer stage and eventually lead to broken ball, it is scaling-off, cracking, deformation etc. symptoms.Above-mentioned various defect problems will lead to grinding efficiency meeting
It is lower and lower, largely reduce the service life of aluminium oxide ballstone, while the impurity largely fallen causes grinding charge
Material destroys contact scar.When the compression strength of alumina balls is low, the above problem is especially prominent.
The compression strength that the mill ball of isostatic pressing has mill ball more molding than rolling much higher.Such as diameter 30mm
Mill ball, resistance to compression made of isostatic pressed are more than 280KN, and rolling is molding is then less than 50KN.But isostatic pressing process is complicated,
Equipment investment is high, and especially for the dry grinding ball of diameter 13mm~30mm, large-scale production critical constraints, efficiency is low, production
Product are of high cost.And it is limited with mill ball compression strength prepared by traditional rolling molding mode, it can not also be applied in dry grinding field.Through
Research, the main reason for causing rolling ball compression strength low are rolling balls during rolling, and hollow pelletizing rounded grain is broken
Broken, refinement, semi-finished product density is high, and product is excessively fine and close after being burnt into, the micro-crack source generally existing that firing cooling procedure generates,
Crackle easily extends after stress, and shock resistance is deteriorated, intensity is low, is also easy to the problems such as wind crystalline substance bursts and blisters occur.
Invention content
The present invention overcomes above-mentioned the deficiencies in the prior art, provides a kind of rolling molding and prepare high resistance to compression alumina lap
The method of medium is particularly suitable for preparing the dry grinding ball for 13mm~30mm that dry grinding field uses.This method passes through
By the way of the pelletizing compounding of different characteristics, similar ball base when obtaining with isostatic pressing makes wherein to contain centainly
Stomata, the crackle that thermal shock generates when reducing firing cooling, and play the role of activeness and quietness.
To achieve the goals above, the present invention includes A, B, C pelletizing three parts for the rolling ball powder of compounding.
A pelletizings are that spray drying directly obtains conventional alumina pelletizing, and pelletizing hardness is low, which is beaten powder
Machine, which crushes to destroy, forms powder, and the entirely chief component of rolling ball.
C pelletizings are that spray drying directly obtains superhard aluminium oxide pelletizing, and case hardness is big, inner hollow, is rolling
It is unlikely to be broken during system, to the introducing portion stomata in rolling ball base, hardening can be modified by this part surface simultaneously
High rigidity pelletizing ball-billet shape in the process formed chock effect, as shown in Fig. 2, to reduce point of rolling ball base
Layer.
B pelletizings are the ultra-fine dust collection powder (and false particle) collected from dust-precipitator when preparing conventional pelletizing A, the granulation
Powder avoids constantly growing up during the rolling of ball base, and cushioning effect can be effectively performed, superhard pelletizing C is prevented to be destroyed.
High rigidity pelletizing is and to improve spray drying temperature realization by adding a large amount of PVA (polyvinyl alcohol).Usually
For the PVA no more than 0.3% to be not added with or added in the molding pelletizing slurry of rolling.To obtain high rigidity pelletizing, Wo Menxian
Add 1.2~2.5% PVA (part PVA it is previously prepared at 10% aqueous solution), it is hard using what is generated after polymeric hardener
Shell improves pelletizing case hardness, improves resistant to breakage ability when it is knocked.On the other hand, spray drying temperature is also to close
Key, the too high organic matter decomposed metamorphic of temperature, temperature is very low, and the drying of PVA components is inadequate, and the degree of polymerization is not achieved, pelletizing hardness
Not enough.
Technical scheme is as follows：A kind of method that rolling molding prepares high resistance to compression aluminum oxide milling media, it is special
Sign is to include the following steps：
(1) raw material and parts by weight
Major ingredient 1#：80-92 parts of 1# alumina powders, 3-15 parts of kaolin；
Auxiliary material 1#：0.5-5 parts of calcium carbonate, 0.5-5 parts of talcum, 0.5-5 parts of silicon powder；
Doping material 2#：80-92 parts of 2# alumina powders, 3-15 parts of kaolin；
Auxiliary material 2#：0.5-5 parts of nano-calcium carbonate (i.e. nanometer grade calcium carbonate), 0.5-5 parts of nanoscale talcum, nanometer spodumene
0.5-5 parts；
Additive：1.2~2.5 parts of polyvinyl alcohol, 0-5 parts of glycerine, 0-2 parts of oleic acid, 0-2 parts of paraffin；
(2) intermittent ball milling is put into togerther after weighing 1# alumina powders, kaolin and the auxiliary material 1# in major ingredient 1# respectively
Wet ball grinding is to 6 μm of D90 ＜ in machine；180 mesh sieve is crossed after fineness qualification and is put into transfer stock tank, then pumps slurry into two with slush pump
It carries out being milled to 4 μm of D90 ＜ in secondary intermittent ball mill；220 mesh sieve is crossed after fineness qualification, electromagnetism obtains ceramic mud after removing iron
1#；
(3) the ceramic mud 1# that step (2) obtains is dried to ceramic prilling powder using press spray granulation tower, then
By obtaining crushed material A (A pelletizings) for use after crushing, the reclaimed materials B (B pelletizings) for being collected simultaneously cyclone dust removal is for use；
(4) doping is expected to be added in horizontal sand mill after 2# alumina powders, kaolin and auxiliary material 2# in 2# are weighed respectively
Ball milling carries out quasi-nano and is finely ground to 0.5 μm of D90 ＜, and fineness qualification adds compound additive and continues ball milling 2-10 hours
Afterwards, blowing crosses 220 mesh sieve, and electromagnetism obtains ceramic mud 2# after removing iron；
(5) the ceramic mud 2# that step (4) obtains doping pelletizing 2# is dried to using press spray granulation tower to wait for
With；
(6) the doping pelletizing 2# that step (5) obtains was subjected to 220 mesh sieve, and obtained 220 mesh and sieves doping granulation below
Powder C (C pelletizings)；
(7) the doping pelletizing C for being obtained the obtained crushed material A of step (3), reclaimed materials B and step (6) is by with subscript
Standard of short duration mixing in bipyramid blender obtains pelletizing D；In mass ratio, crushed material A：Reclaimed materials B：Adulterate pelletizing C=1:
0.05-0.2：0.01-0.03；
(8) the pelletizing D for obtaining step (7) rolling, sieving in sugar coating machine, is made the semi-finished product of diameter 10-20mm
Ball base；Semi-finished product ball base is rolled onto always 13-30mm target semi-finished product using crushed material A again；
(9) it and then dries, be fired into finished product；Specially：By target semi-finished product ball base obtained by step (8) in 60~
At a temperature of 150 DEG C after dry 46~50h, the target semi-finished product ball base after drying is burnt into work slowly in hyperthermia tunnel Kiln using low temperature
Skill keeps the temperature 8-12h, then with 15~30 with the heating speed of 8~25 DEG C/min from room temperature to 1400~1430 DEG C of firings
DEG C/cooling of the cooling velocity of min, obtain the molding dry ball milling alumina balls of rolling.
The preparation method of 1# alumina powders is in step (1) of the present invention：It is added in aluminium hydroxide (water content 2-3%)
(component and its weight ratio of the composite mineralizer are boric acid to the composite mineralizer of quality 1-10 ‰：Ammonium chloride：Magnesia：Nitre
Sour ammonium=1：0.5：0.3：0.3) it is fired in 1300-1480 DEG C of temperature in rotary kiln.α in prepared 1# alumina powders
Inversion of phases rate accounts for 89-93% (remaining is γ-phase alumina), and former crystal size D90 is about 4.0 μm (3.0~5.0 μm), belongs to piece
Shape crystalline structure, if market has the aluminium powder for meeting conditions above that can also use.
The preparation method of 2# alumina powders is in step (1) of the present invention：γ-phase alumina is directly loadable into saggar in tunnel
It is fired in kiln, firing temperature is 1280-1420 DEG C, and soaking time is 4-20 hours.α inversion of phases in prepared 2# alumina powders
Rate accounts for 70-93% (remaining is γ-phase alumina), and former crystal size D90 is about 1.5 μm (1.0~2.0 μm), belongs to granular crystal form
Structure.
A ball milling uses alumina balls masonry for abrasive media in step (2) of the present invention, expects in mass ratio：Ball：Water=
1：2-3：1.Ball-milling Time 25-35 hours, 6 μm of slurry fineness D90 ＜ (are sieved after 180 mesh after slurry fineness qualification, are removed
Small ballstone and do not grind thin rough material), slurry water sub-control system is in 35-55%.
Secondary ball milling abrasive media uses wear-resisting alumina microballon, slurry in step (2) of the present invention：Ball=1：2.5-3.It is secondary
Ball-milling Time 25-35 hours, 4 μm of slurry fineness D90 ＜ (are sieved after 220 mesh after slurry fineness qualification, are removed small ballstone and do not grind
Levigate rough material), slurry water sub-control system is in 32-40%.
Abrasive media uses wear-resisting alumina microballon in step (4) of the present invention, by quality material：Ball：Water=1：2-3：1.Slurry
Expect that fineness control (sieves after 220 mesh after slurry fineness qualification in D90 ＜, removes small ballstone and do not grind thin thick object for 0.5 μm
Material).
The tower top temperature of the press spray granulation tower of step (3) of the present invention is 450-550 DEG C, lower mouth temperature 80-100
DEG C, powder moisture is controlled in 0.5-5%.Beat powder using what common pulverizer be granulated powder particles, particle size without
It is required that.
The press spray granulation tower and step (3) of step (5) of the present invention are general, and index tower top temperature is 500-900 DEG C,
Lower mouth temperature is 100-120 DEG C, and moisture controls between 0.3-2%.
In step (7) mixed process of the present invention, the size according to product is needed to be finely adjusted section, rolling size is kept to get over
Greatly, the bigger principle of the ratio of doping pelletizing C；Any other additive need not be added during mixed powder simultaneously, keep mixed
The powder time is 10-15 minutes or so.
When the following semi-finished product ballstone of step (8) rolling 10-20mm of the present invention, it is only necessary to be sieved to seed, together
The quick rolling globulations of Shi Jinhang, need not polish；When continuing rolling to target semi-finished product using crushed material A, at any time with trip
Mark calliper semi-finished product ball base size, ensure to complete during rolling 2 sievings (1, take the dish out of the pot before be sieved, 2, repeated
Sieve)；In order to delay the consistency of semi-finished product, during rolling plus a defective material stand-by period is less than 60s；Excessively complete sieve before taking the dish out of the pot
Target semi-finished product 20-260s polishings are carried out in pot.
On the one hand alumina ceramic grinding ball considers that its abrasion wants small as the application in dry grinding field, on the other hand also to pursue
Compression strength is big, and shock resistance is good.After preparing formulation material using wet ball grinding, spray tower granulation, generally broken pelletizing or
The direct rolling molding of the not broken pelletizing of person, pelletizing is broken during rolling, adds water posterior synechia, collides with each other and grow up simultaneously
Densification, the semi-finished product density resulted in is excessively fine and close, fire product when due to interiors of products stress concentration (or other aspect
The reason of) product lower compressive strength, shock resistance variation, wind crystalline substance is led to problems such as to burst and blister.Using isostatic pressed at
Due to largely retaining a little aluminium oxide pelletizing pattern, Shao Liangqi inside semi-finished product prepared by type (half isostatic pressing)
Hole is conducive to improve its thermal shock resistance, so rolling is molded the alumina ball prepared than isostatic pressing (half isostatic pressing)
Compression strength is much lower, how to improve the compression strength that rolling molding prepares product, and preparation uses straight in dry grinding field
The alumina ceramic grinding ball of diameter 13mm~30mm will be as the research emphasis of this patent.
The major ingredient 1# and auxiliary material 1# is when preparing pelletizing, the most conventional process route of use, cost of material and system
Standby at low cost, prepared crushed material A and reclaimed materials B intensity is very low.
Doping material 2#, auxiliary material 2# and the compound additive has the characteristics that when preparing pelletizing：1, by adding
Powder particles are granulated through the heat setting formation high rigidity of spray drying tower after increasing weight northylen alcohol, doping material pelletizing is made to use
It can not be all crushed by the collision of semi-finished product ballstone in the process, finally the member-retaining portion pelletizing pattern in semi-finished product, especially
It is to retain its hollow-core construction, so as to introduce a small amount of stomata in semi-finished product.2, the doping material pelletizing hardened during rolling
Chock effect gradually, successively is effectively formed in growth process in semi-finished product, and the semi-finished product of rolling can be effectively prevent to be layered, reached
The effect of semi-finished product enhancing is arrived.
The polyvinyl alcohol model is 1799, with directly being melted using hot steam after 10% aqueous solution, is made at high temperature
Grain can be only achieved the case-hardened purpose of pelletizing.It is common to be unable to reach the hard of pelletizing by the way of agitating and heating thawing
Change intensity.
The present invention adds the micro composite sintering agent being made of spodumene, talcum and calcium carbonate in formula, belongs to conventional
Sintering aid.
The nano-calcium carbonate grain size that the present invention adds in formula is 70-700 nanometers, and nano-talc grain size is received for 50-700
Rice, nanometer spodumene grain size are 50-700 nanometers.
The present invention compared with prior art, has following outstanding feature：
(1) present invention prepares the aluminum oxide milling media with specific dimensions using rolling moulding process, can be applied to
Dry grinding field, preparation process are convenient for mass production, production cost low.
(2) the doping pelletizing for using surface to be modified hardening forms chock effect in semi-finished product, can effectively prevent rolling
The semi-finished product of system are layered, and have achieved the effect that semi-finished product enhance, prevent transport, loading of kiln process it is broken.
(3) retain part pelletizing pattern in semi-finished product, complete not being connected to of Dispersed precipitate, tiny stomata, reach buffering
The effect that external force and external force absorb.
(4) aluminum oxide milling media prepared by the present invention has the characteristics that abrasion are low, intensity is high, is suitble to dry grinding, general
Logical ball 13mm compression strength is about 8KN, and mill ball 13mm compression strength ＞ 30KN of the present invention, it is 0.03 ‰ to wear away, and is applicable in completely
Various dry grinding industries use.
Description of the drawings
Fig. 1 is the process flow chart of the present invention；
Fig. 2 is the section schematic diagram of rolling mill ball.
Specific implementation mode
Embodiment is only described further the present invention, but is not limited only to this, and those skilled in the art is not paying wound
The property made obtains other embodiment under the premise of working, and belongs to the scope of protection of the invention.
The preparation method of 1# alumina powders is：The grandidierite of its quality 3 ‰ is added in aluminium hydroxide (water content 2.7%)
(component and its weight ratio of the composite mineralizer are boric acid to agent：Ammonium chloride：Magnesia：Ammonium nitrate=1：0.5：0.3：
0.3) it is fired in 1450 DEG C of temperature in rotary kiln.α inversion of phases rates account for 93% (remaining are in prepared 1# alumina powders
γ-phase alumina), former crystal size D90 is about 4.0 μm, belongs to sheet crystalline structure, if there is the aluminium for meeting conditions above in market
Powder can also use.
The preparation method of 2# alumina powders is：γ-phase alumina of Shandong producer is directly loadable into saggar in tunnel oven
Middle firing, firing temperature are 1360 DEG C, and soaking time is 16 hours.α inversion of phases rates account for 88% in prepared 2# alumina powders
(remaining is γ-phase alumina), former crystal size D90 is about 1.5 μm, belongs to granular crystalline structure.
The chemical composition and parts by weight of other raw materials are as shown in table 1.
The chemical composition and parts by weight of 1 other raw materials of table
The intermittent milling parameters that the present invention uses for：Appearance and size 3000*4500mm, rotating speed 13r/min.
The horizontal sand mill technological parameter that the present invention uses for：Cylinder barrel volume 30L, speed of mainshaft 200-1500r/min, production
It can 0.5-1.2T/h.
Embodiment 1：
(1) raw material and parts by weight
Major ingredient 1#：88 parts of 1# alumina powders, 10 parts of kaolin；
Auxiliary material 1#：0.5 part of calcium carbonate, 0.5 part of talcum, 1 part of silicon powder；
Doping material 2#：88 parts of 2# alumina powders, 10 parts of kaolin；
Auxiliary material 2#：0.5 part of nano-calcium carbonate, 0.5 part of nanoscale talcum, 1 part of nanometer spodumene；
Additive：1.2 parts of polyvinyl alcohol, 0.5 part of glycerine, 0.2 part of oleic acid, 0.2 part of paraffin；
(2) intermittent ball milling is put into togerther after weighing 1# alumina powders, kaolin and the auxiliary material 1# in major ingredient 1# respectively
Wet ball grinding (uses alumina balls masonry for abrasive media, expects in machine：Ball：Water=1：2.5：1), a Ball-milling Time 35 is small
When, D90=5.5 μm of slurry fineness crosses 180 mesh sieve after fineness qualification and is put into transfer stock tank, then pumps slurry into two with slush pump
Ball milling is carried out in secondary intermittent ball mill, and (abrasive media uses wear-resisting alumina microballon, slurry：Ball=1：3), the secondary ball milling time
25 hours, D90=4 μm of slurry fineness crossed 220 mesh sieve after fineness qualification, and electromagnetism obtains ceramic mud 1# after removing iron；
(3) the ceramic mud 1# that step (2) obtains ceramic prilling powder is dried to using press spray granulation tower to pass through
Acquisition crushed material A is for use after crushing, and the reclaimed materials B for being collected simultaneously cyclone dust removal is for use；The tower top temperature of pressure spray drying tower
Degree is 550 DEG C, and lower 100 DEG C of mouth temperature, powder moisture is controlled 0.5%.It carries out being granulated powder particles using common pulverizer
Play powder, particle size no requirement (NR).
(4) doping is expected to be added in horizontal sand mill after 2# alumina powders, kaolin and auxiliary material 2# in 2# are weighed respectively
(abrasive media uses wear-resisting alumina microballon to ball milling, by quality material：Ball：Water=1：2.5：1, speed of mainshaft 400r/min, production capacity
0.5T/h, slurry fineness control at D90=0.5 μm) carry out quasi-nano fine gtinding, fineness qualification add compound additive after
For continuous ball milling after 3 hours, blowing crosses 220 mesh sieve, and electromagnetism obtains ceramic mud 2# after removing iron；
(5) the ceramic mud 2# that step (4) obtains doping pelletizing 2# is dried to using press spray granulation tower to wait for
With；Tower top temperature is 900 DEG C, and lower mouth temperature is 120 DEG C, and moisture is controlled 0.3%.
(6) the auxiliary material pelletizing 2# that step (5) obtains was subjected to 220 mesh sieve, and obtained 220 mesh and sieves doping granulation below
Powder C.
(7) the doping pelletizing C for being obtained the obtained crushed material A of step (3), reclaimed materials B and step (6) is by with subscript
Standard of short duration mixing in bipyramid blender obtains pelletizing D.Crushed material A：Reclaimed materials B：Adulterate pelletizing C=1:0.12：0.01,
The mixed powder time is 10 minutes or so.
(8) the pelletizing D for obtaining step (7) rolling, sieving in sugar coating machine, is made the semi-finished product ball of diameter 10mm
Base；10mm semi-finished product ball bases are being used into crushed material A rolling 13mm targets semi-finished product always.
(9) after by target semi-finished product ball base obtained by step (8) with dry 50h at a temperature of 60 DEG C, by the target after drying
Semi-finished product ball base uses the slow firing technique of low temperature in hyperthermia tunnel Kiln, with the heating speed of 10 DEG C/min from room temperature to 1400
DEG C firing, is kept the temperature 8h, then cooled down with the cooling velocity of 15 DEG C/min, obtains the molding dry ball milling alumina balls of rolling.Production
Moral character can be shown in Table 2.
Embodiment 2：
(1) raw material and parts by weight
Major ingredient 1#：89 parts of 1# alumina powders, 8 parts of kaolin；
Auxiliary material 1#：1.5 parts of calcium carbonate, 0.5 part of talcum, 1 part of silicon powder；
Doping material 2#：89 parts of 2# alumina powders, 9.5 parts of kaolin；
Auxiliary material 2#：0.5 part of nano-calcium carbonate, 0.5 part of nanoscale talcum, 0.5 part of nanometer spodumene；
Additive：2.0 parts of polyvinyl alcohol, 1.2 parts of glycerine, 0.7 part of oleic acid, 0.3 part of paraffin；
(2) intermittent ball milling is put into togerther after weighing 1# alumina powders, kaolin and the auxiliary material 1# in major ingredient 1# respectively
Wet ball grinding (uses alumina balls masonry for abrasive media, expects in machine：Ball：Water=1：2.7：1), a Ball-milling Time 32 is small
When, D90=5.2 μm of slurry fineness crosses 180 mesh sieve after fineness qualification and is put into transfer stock tank, then pumps slurry into two with slush pump
Ball milling is carried out in secondary intermittent ball mill, and (abrasive media uses wear-resisting alumina microballon, slurry：Ball=1：3), the secondary ball milling time
28 hours, D90=3.6 μm of slurry fineness crossed 220 mesh sieve after fineness qualification, and electromagnetism obtains ceramic mud 1# after removing iron；
(3) the ceramic mud 1# that step (2) obtains ceramic prilling powder is dried to using press spray granulation tower to pass through
Acquisition crushed material A is for use after crushing, and the reclaimed materials B for being collected simultaneously cyclone dust removal is for use；The tower top temperature of pressure spray drying tower
Degree is 520 DEG C, and lower 97 DEG C of mouth temperature, powder moisture is controlled 0.6%.It carries out being granulated beating for powder particles using common pulverizer
Powder, particle size no requirement (NR).
(4) doping is expected to be added in horizontal sand mill after 2# alumina powders, kaolin and auxiliary material 2# in 2# are weighed respectively
(abrasive media uses wear-resisting alumina microballon to ball milling, by quality material：Ball：Water=1：2.6：1, speed of mainshaft 700r/min, production capacity
0.6T/h, slurry fineness control at D90=0.2 μm) carry out quasi-nano fine gtinding, fineness qualification add compound additive after
For continuous ball milling after 5 hours, blowing crosses 220 mesh sieve, and electromagnetism obtains ceramic mud 2# after removing iron；
(5) the ceramic mud 2# that step (4) obtains doping pelletizing 2# is dried to using press spray granulation tower to wait for
With；Tower top temperature is 870 DEG C, and lower mouth temperature is 106 DEG C, and moisture is controlled 0.5%.
(6) the auxiliary material pelletizing 2# that step (5) obtains was subjected to 220 mesh sieve, and obtained 220 mesh and sieves doping granulation below
Powder C.
(7) the doping pelletizing C for being obtained the obtained crushed material A of step (3), reclaimed materials B and step (6) is by with subscript
Standard of short duration mixing in bipyramid blender obtains pelletizing D.Crushed material A：Reclaimed materials B：Adulterate pelletizing C=1:0.07：
0.028, it is 13 minutes or so to mix the powder time.
(8) the pelletizing D for obtaining step (7) rolling, sieving in sugar coating machine, is made the semi-finished product ball of diameter 15mm
Base；15mm semi-finished product ball bases are being used into crushed material A rolling 17mm targets semi-finished product always.
(9) after by target semi-finished product ball base obtained by step (8) with dry 46h at a temperature of 65 DEG C, by the target after drying
Semi-finished product ball base uses the slow firing technique of low temperature in hyperthermia tunnel Kiln, with the heating speed of 12 DEG C/min from room temperature to 1430
DEG C firing, is kept the temperature 8h, then cooled down with the cooling velocity of 17 DEG C/min, obtains the molding dry ball milling alumina balls of rolling.Production
Moral character can be shown in Table 2.
Embodiment 3：
(1) raw material and parts by weight
Major ingredient 1#：90 parts of 1# alumina powders, 7 parts of kaolin；
Auxiliary material 1#：1 part of calcium carbonate, 1 part of talcum, 1 part of silicon powder；
Doping material 2#：85 parts of 2# alumina powders, 12 parts of kaolin；
Auxiliary material 2#：1 part of nano-calcium carbonate, 0.5 part of nanoscale talcum, 1.5 parts of nanometer spodumene；
Additive：2.5 parts of polyvinyl alcohol, 1.5 parts of glycerine, 1.2 parts of oleic acid, 0.3 part of paraffin；
(2) intermittent ball milling is put into togerther after weighing 1# alumina powders, kaolin and the auxiliary material 1# in major ingredient 1# respectively
Wet ball grinding (uses alumina balls masonry for abrasive media, expects in machine：Ball：Water=1：3：1), Ball-milling Time 30 hours,
D90=4.8 μm of slurry fineness crosses 180 mesh sieve after fineness qualification and is put into transfer stock tank, then pumps slurry into secondary with slush pump
Ball milling is carried out in formula of having a rest ball mill, and (abrasive media uses wear-resisting alumina microballon, slurry：Ball=1：3), the secondary ball milling time 26 is small
When, D90=3.2 μm of slurry fineness crosses 220 mesh sieve after fineness qualification, and electromagnetism obtains ceramic mud 1# after removing iron；
(3) the ceramic mud 1# that step (2) obtains ceramic prilling powder is dried to using press spray granulation tower to pass through
Acquisition crushed material A is for use after crushing, and the reclaimed materials B for being collected simultaneously cyclone dust removal is for use；The tower top temperature of pressure spray drying tower
Degree is 510 DEG C, and lower 93 DEG C of mouth temperature, powder moisture is controlled 0.9%.It carries out being granulated beating for powder particles using common pulverizer
Powder, particle size no requirement (NR).
(4) doping is expected to be added in horizontal sand mill after 2# alumina powders, kaolin and auxiliary material 2# in 2# are weighed respectively
(abrasive media uses wear-resisting alumina microballon to ball milling, by quality material：Ball：Water=1：2.8：1, speed of mainshaft 600r/min, production capacity
0.5T/h, slurry fineness are controlled at D90=0.08 μm) quasi-nano fine gtinding is carried out, fineness qualification adds compound additive
Continue ball milling after 10 hours, blowing crosses 220 mesh sieve, and electromagnetism obtains ceramic mud 2# after removing iron；
(5) the ceramic mud 2# that step (4) obtains doping pelletizing 2# is dried to using press spray granulation tower to wait for
With；Tower top temperature is 790 DEG C, and lower mouth temperature is 110 DEG C, and moisture is controlled 0.4%.
(6) the auxiliary material pelletizing 2# that step (5) obtains was subjected to 220 mesh sieve, and obtained 220 mesh and sieves doping granulation below
Powder C.
(7) the doping pelletizing C for being obtained the obtained crushed material A of step (3), reclaimed materials B and step (6) is by with subscript
Standard of short duration mixing in bipyramid blender obtains pelletizing D.Crushed material A：Reclaimed materials B：Adulterate pelletizing C=1:0.2：0.02,
The mixed powder time is 11 minutes or so.
(8) the pelletizing D for obtaining step (7) rolling, sieving in sugar coating machine, is made the semi-finished product ball of diameter 13mm
Base；13mm semi-finished product ball bases are being used into crushed material A rolling 15mm targets semi-finished product always.
(9) after by target semi-finished product ball base obtained by step (8) with dry 48h at a temperature of 70 DEG C, by the target after drying
Semi-finished product ball base uses the slow firing technique of low temperature in hyperthermia tunnel Kiln, with the heating speed of 16 DEG C/min from room temperature to 1420
DEG C firing, is kept the temperature 9h, then cooled down with the cooling velocity of 16 DEG C/min, obtains the molding dry ball milling alumina balls of rolling.Production
Moral character can be shown in Table 2.
The performance indicator of 2 embodiment 1-3 products of table
| Equivalent abrasion ‰ | Resistance to compression KN | Quality after dry grinding | |
| Embodiment 1 | 0.03 | ＞ 30 | Without broken ball |
| Embodiment 2 | 0.027 | ＞ 40 | Without broken ball |
| Embodiment 3 | 0.029 | ＞ 38 | Without broken ball |
Claims (6)
1. a kind of rolling is molded the method for preparing high resistance to compression aluminum oxide milling media, characterized in that include the following steps：
(1) raw material and parts by weight
Major ingredient 1#：80-92 parts of 1# alumina powders, 3-15 parts of kaolin；
Auxiliary material 1#：0.5-5 parts of calcium carbonate, 0.5-5 parts of talcum, 0.5-5 parts of silicon powder；
Doping material 2#：80-92 parts of 2# alumina powders, 3-15 parts of kaolin；
Auxiliary material 2#：0.5-5 parts of nano-calcium carbonate, 0.5-5 parts of nanoscale talcum, 0.5-5 parts of nanometer spodumene；
Additive：1.2~2.5 parts of polyvinyl alcohol, 0-5 parts of glycerine, 0-2 parts of oleic acid, 0-2 parts of paraffin；
α inversion of phases rates account for 89-93% in the 1# alumina powders, and former crystal size D90 is 3.0~5.0 μm, belongs to sheet crystal form knot
Structure；
α inversion of phases rates account for 70-93% in the 2# alumina powders, and former crystal size D90 is 1.0~2.0 μm, belongs to granular crystal form knot
Structure；
The polyvinyl alcohol using when be added to the water by 10% mass ratio, then directly melted using hot steam；
(2) it is put into togerther in intermittent ball mill after weighing 1# alumina powders, kaolin and the auxiliary material 1# in major ingredient 1# respectively
Wet ball grinding is to 6 μm of D90 ＜；180 mesh sieve is crossed after fineness qualification and is put into transfer stock tank, then pumps slurry into secondary with slush pump
It carries out being milled to 4 μm of D90 ＜ in formula of having a rest ball mill；220 mesh sieve is crossed after fineness qualification, electromagnetism obtains ceramic mud 1# after removing iron；
(3) the ceramic mud 1# that step (2) obtains is dried to ceramic prilling powder using press spray granulation tower, then passed through
Acquisition crushed material A is for use as A pelletizings after crushing, and the reclaimed materials B for being collected simultaneously cyclone dust removal is for use as B pelletizings；
(4) it is added in horizontal sand mill and carries out after weighing 2# alumina powders, kaolin and the auxiliary material 2# in doping material 2# respectively
Quasi-nano is finely milled to 0.5 μm of D90 ＜, and addition additive continues ball milling 2-10 hours after fineness qualification, and blowing crosses 220 mesh
Sieve, electromagnetism obtain ceramic mud 2# after removing iron；
(5) that ceramic mud 2# that step (4) obtains is dried to doping pelletizing 2# using press spray granulation tower is for use；Institute
The tower top temperature for stating press spray granulation tower is 500-900 DEG C；
(6) the doping pelletizing 2# that step (5) obtains was subjected to 220 mesh sieve, and obtained 220 mesh and sieves doping pelletizing C below,
As C pelletizings；The C pelletizings are added with 1.2~2.5% polyvinyl alcohol；
(7) the C pelletizings that the obtained A pelletizings of step (3), B pelletizings and step (6) are obtained are mixed by following standard and is obtained
Obtain pelletizing D；In mass ratio, A pelletizings：B pelletizings：Pelletizing=1 C:0.05-0.2：0.01-0.03；
(8) the pelletizing D for obtaining step (7) rolling, sieving in sugar coating machine, is made the semi-finished product ball base of diameter 10-20mm；
Semi-finished product ball base is rolled onto always 13-30mm target semi-finished product using A pelletizings again；
(9) it and then dries, be fired into finished product.
2. a kind of rolling as described in claim 1 is molded the method for preparing high resistance to compression aluminum oxide milling media, characterized in that institute
Stating step (9) is specially：By target semi-finished product ball base obtained by step (8) at a temperature of 60~150 DEG C after dry 46~50h,
Target semi-finished product ball base after drying is used into the slow firing technique of low temperature in hyperthermia tunnel Kiln, with the heating speed of 8~25 DEG C/min
Degree is kept the temperature 8-12h, then cooled down with the cooling velocity of 15~30 DEG C/min, obtained from room temperature to 1400~1430 DEG C of firings
Product.
3. a kind of rolling as claimed in claim 1 or 2 is molded the method for preparing high resistance to compression aluminum oxide milling media, feature
It is that a ball milling uses alumina balls masonry for abrasive media in the step (2), expects in mass ratio：Ball：Water=1：2-3：1；
Ball-milling Time 25-35 hours, 6 μm of slurry fineness D90 ＜, slurry water sub-control system is in 35-55%.
4. a kind of rolling as claimed in claim 1 or 2 is molded the method for preparing high resistance to compression aluminum oxide milling media, feature
It is that secondary ball milling abrasive media uses wear-resisting alumina microballon, slurry in the step (2)：Ball=1：2.5-3；When secondary ball milling
Between 25-35 hours, 4 μm of slurry fineness D90 ＜, slurry water sub-control system is in 32-40%.
5. a kind of rolling as claimed in claim 1 or 2 is molded the method for preparing high resistance to compression aluminum oxide milling media, feature
It is that abrasive media uses wear-resisting alumina microballon in the step (4), by quality material：Ball：Water=1：2-3：1.
6. a kind of rolling as claimed in claim 1 or 2 is molded the method for preparing high resistance to compression aluminum oxide milling media, feature
It is that the tower top temperature of the press spray granulation tower of the step (3) is 450-550 DEG C, lower 80-100 DEG C of mouth temperature, powder water
Sub-control system is in 0.5-5%；Mouth temperature is 100-120 DEG C under the press spray granulation tower of the step (5), and moisture control exists
Between 0.3-2%.
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| CN108203295A (en) * | 2017-11-01 | 2018-06-26 | 山东安瑞达新材料有限公司 | Cement mill ball prepared using flint clay tailing as raw material and preparation method thereof |
| CN109761586A (en) * | 2019-03-06 | 2019-05-17 | 娄底市安地亚斯电子陶瓷有限公司 | A kind of preparation method of power battery connector ceramic material |
| CN110451962B (en) * | 2019-08-23 | 2022-06-21 | 内蒙古科技大学 | Submillimeter-level zirconia ceramic ball and preparation method thereof |
| CN111116183A (en) * | 2019-12-31 | 2020-05-08 | 青海圣诺光电科技有限公司 | Preparation method of alumina ceramic grinding ball |
| CN112486128B (en) * | 2020-12-07 | 2021-12-03 | 东莞市琅菱机械有限公司 | Powder raw material manufacturing control method and system based on MES system |
| CN113735571A (en) * | 2021-09-14 | 2021-12-03 | 中材高新材料股份有限公司 | Grinding medium and preparation method thereof |
| CN117735962B (en) * | 2023-12-21 | 2024-06-11 | 宁波国锋新材料科技有限公司 | Alumina grinding medium and preparation method thereof |
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