CN104845584A - Nonmetal grinding medium for cement grinding, and application thereof - Google Patents
Nonmetal grinding medium for cement grinding, and application thereof Download PDFInfo
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Abstract
The invention relates to the field of cement grinding, and concretely relates to a nonmetal grinding medium for cement grinding, and an application thereof. The nonmetal grinding medium for cement grinding is prepared from alumina or bauxite as a main raw material through burdening, molding and calcining; and the content of Al2O3 in the nonmetal grinding medium is 50-98wt%, the compressive strength of the medium is greater than 1000Mpa, and the Mohs hardness of the medium reaches above 7. The nonmetal grinding medium has the following advantages: 1, the power consumption of a grinding machine can be substantially reduced, so energy saving and consumption reduction are reached; 2, generation of static electricity is prevented, electrostatic adsorption is reduced, and the grinding efficiency is improved; and 3, the nonmetal grinding medium is prepared by adopting alumina as the main component, has high strength and has a micro-powder filling effect, so the quality of cement is not influenced even a small amount of particles shed and fall into the cement.
Description
Technical field
The present invention relates to cement grinding field, specifically for non-metal grinding medium and the application thereof of cement grinding.
Background technology
Cement grinding is that raw material pulverizing is mixed by the various ways such as collision, friction, rolling, extruding of a large amount of grinding mediums loaded in mill when being rotated by ball mill.Current cement grinding generally adopts metal grinding media (steel ball or steel forging), and metal grinding media has that intensity is high, the advantage of long service life, but adopts metal grinding media as cement grinding medium, has following deficiency:
One is adopt metal grinding media, can produce a large amount of electrostatic, because the cement micro-powder with electrostatic small is in a large number wrapped in around metal grinding body, reduce the collision dynamics between metal grinding body, reduce mill efficiency.Need to add grinding aid to raise the efficiency, thus add cement cost.
Two is that the proportion of metal grinding media is comparatively large, causes power consumption of the mill very large, does not reach power conservation requirement.
Non-metal grinding medium is mainly usually used in the wet grinding of ceramics powder at present, in mill, surging force is relatively little, composition simultaneously due to non-metal grinding medium is close with the composition of pottery, add the ceramics powder after pulverizing also will fire, so, even if there is a small amount of non-metal grinding medium to enter in ceramics powder, the quality of pottery also can not be affected.
But for cement ball mill, belong to dry method grinding, do not changing under grinding machine parameter, directly replace metal grinding media with non-metal grinding medium, the phenomenon that non-metal grinding medium is easy to crack, surface produces pit can be produced, abrasive dust efficiency can be reduced.So, till now, do not find a kind of suitable non-metal grinding medium, replace metal grinding media.
Priority matters:
The applying date: on 01 06th, 2015.Application number: 2015100032948.Applicant: Zhu Hui leaf is just luxuriant.Invention and created name: aluminium oxide ceramic ball is as the application of grinding medium in cement ball mill.
Summary of the invention
The object of the present invention is to provide a kind of non-metal grinding medium for cement grinding, because the proportion of non-metal grinding medium is less than metal grinding media, therefore alternative metals grinding medium in cement ball mill, and suitably coordinate grinding machine adjustment, power consumption of the mill can be made greatly to reduce, thus reach energy-saving and cost-reducing object; Can electrostatic be prevented simultaneously, reduce electrostatic adhesion, improve mill efficiency.
The present invention is realized by following measures:
The present invention relates to a kind of non-metal grinding medium for cement grinding, it is characterized in that with aluminum oxide or alumina for main raw material(s), be made by batching, shaping, calcining; Al in described non-metal grinding medium
2o
3content be 50-98wt%, ultimate compression strength is higher than 1000Mpa, and Mohs' hardness reaches more than 7.
Non-metal grinding medium described in the invention described above, in order to it improves nonferromagnetic substance, other component also containing 2-50wt%, other described component is one or more in silicon oxide, ferric oxide, magnesium oxide, calcium oxide, silicon nitride, zirconium white and nano-powder.
Non-metal grinding medium described in the invention described above, preferred scheme is, Al in described non-metal grinding medium
2o
3content be 70-98wt%, the content of other composition is 2-30wt%, and ultimate compression strength is higher than 2000Mpa, and Mohs' hardness reaches more than 8.
Non-metal grinding medium described in the invention described above is compression moulding time shaping, and during compression moulding, pressure is 40-150MPa; Temperature during calcining is 1100-1600 DEG C.Or be that rolling is shaping time shaping, temperature during calcining is 1100-1600 DEG C.
Non-metal grinding medium described in the invention described above, described non-metal grinding medium is made into spherical or forging shape (i.e. Ceramic Balls or pottery forging); The diameter of described Ceramic Balls is 15-120mm; The diameter of described pottery forging is 10-70mm, and length is 15-70mm.
The invention still further relates to the above-mentioned application of non-metal grinding medium in cement ball mill.
The above-mentioned application of non-metal grinding medium in cement ball mill, the filling ratio of non-metal grinding medium is in the scope of 20-50%.
The invention still further relates to aluminium oxide ceramic ball or pottery forging as the application of grinding medium in cement ball mill.
The above-mentioned application of non-metal grinding medium in cement ball mill, Ceramic Balls or the filling ratio of pottery forging in cement ball mill are 20-50%; Ceramic Balls or pottery forging in Al
2o
3content be 70-98wt%, the content of other compositions is 2-30wt%.
Beneficial effect of the present invention:
The first, the present invention's employing take aluminum oxide as the non-metal grinding medium of main component, in cement ball mill, because the proportion of alumina ceramic material is less than metal grinding media, significantly can reduce power consumption of the mill, thus reach energy-saving and cost-reducing.Although non-metal grinding Filled Dielectrics amount is high, with regard to comprehensive benefit, compared with employing metal grinding media, still there is good economic benefit.
The second, adopt non-metal grinding medium of the present invention, alternative metals grinding medium in cement ball mill, can prevent electrostatic, reduces electrostatic adhesion, improves mill efficiency; Under the prerequisite of identical ball mill filling ratio, power consumption of the mill reduces greatly, thus reaches energy-saving and cost-reducing object.
3rd, the present invention's employing take aluminum oxide as the non-metal grinding medium of main component, even if having a small amount of particle detachment in cement, because its intensity is high, can play the effect that micro mist is filled, can not affect cement quality.
Embodiment
The invention provides a kind of aluminium oxide ceramic ball or pottery forging as the application of grinding medium in cement ball mill, aluminium oxide ceramic ball or pottery forging with aluminum oxide or alumina for main raw material(s), add other material a small amount of, as silicon oxide, ferric oxide, magnesium oxide, calcium oxide, silicon nitride, zirconium white, nano-powder etc., obtain through steps such as batching, compacting or rolling is shaping, calcinings, Al in gained aluminium oxide ceramic ball
2o
3content be 50-98wt%, the content of other materials is 2-50wt%.
Aluminium oxide ceramic ball loads in cement ball mill according to a certain ratio as grinding medium, and according to the difference of grinding material and mill speed, filling ratio is at 20-50%.
Because the Mohs' hardness of aluminium oxide ceramic ball or pottery forging reaches more than 7, ultimate compression strength, higher than 1000Mpa, has good fragmentation and mill capacity, and can eliminate partial electrostatic absorption, reduce cohesion and so-called buffer layer, thus improve mill output and grinding effect; Because aluminium oxide ceramic ball or the ceramic proportion forged are much smaller than metal grinding ball, can not only improve mill output, the current consumption of grinding machine reduces greatly simultaneously, thus reduction energy consumption of mill, reach energy-saving and cost-reducing, improve the object of mill efficiency, produce good economic benefit.
embodiment 1
Take alumina powder as main raw material(s), grinding to 800 order, is formed into specified dimension by nodulizer rolling, is fired to 1500 degree, obtained Al
2o
3content is the aluminium oxide ceramic ball of 95wt%.The volume density of gained aluminium oxide ceramic ball is 3.8g/cm
3, ultimate compression strength is higher than 2000Mpa, and Mohs' hardness reaches more than 8.
In the cement ball mill of ф 3.2 × 13m tri-storehouse, above-mentioned obtained aluminium oxide ceramic ball is replaced the metal grinding media in the 3rd storehouse, the filling ratio with 35% calculates, and metal grinding media loading capacity is 91 tons originally, and the average current drain producing cement per ton is about 38kWh; Aluminium oxide ceramic ball is used to be 38 tons, wherein 8 tons of diameter 20mm respectively, 22 tons of diameter 30mm, 8 tons of diameter 40mm, by coordinating grinding machine manipulation, compared with metal grinding media, mill grinding efficiency is substantially identical, decrease the usage quantity of grinding aid, grinding machine is produced cement average electrical per ton power consumption and is reduced to below 33kWh simultaneously.The abrasion of aluminium oxide ceramic ball are 12 grams of/ton of cement.
embodiment 2
Take alumina powder as main raw material(s), grinding to 800 order, by pressing machine compression moulding, forming pressure is 100Mpa, and compact dimensions is the forging shape of diameter 20mm, length 25mm, is fired to 1520 degree, obtained Al
2o
3content is the alumina-ceramic forging of 92wt%.The volume density of gained alumina-ceramic forging is 4.5g/cm
3, ultimate compression strength is higher than 2100Mpa, and Mohs' hardness reaches more than 8.
In the cement ball mill of ф 3.0 × 11m bis-storehouse, by the metal grinding media in above-mentioned obtained alumina-ceramic forging replacement second storehouse, the filling ratio with 33% calculates, and metal grinding media loading capacity is 60 tons originally, and the average current drain producing cement per ton is about 38kWh; Use alumina-ceramic forging to be 35 tons, by coordinating grinding machine manipulation, compared with metal grinding media, mill grinding efficiency is substantially identical, decreases the usage quantity of grinding aid simultaneously, and grinding machine is produced cement average current drain per ton and is reduced to below 34kWh.The abrasion of alumina-ceramic forging are 10 grams of/ton of cement.
embodiment 3
Take bauxite mine as main raw material(s), grinding to 800 order, is formed into specified dimension by nodulizer rolling, is fired to 1400 degree, obtained Al
2o
3content is the aluminium oxide ceramic ball of 55wt%.The volume density of gained aluminium oxide ceramic ball is 4.4g/cm
3, ultimate compression strength is higher than 1200Mpa, and Mohs' hardness reaches more than 7.
In the cement ball mill of ф 3.8 × 13m bis-storehouse, above-mentioned obtained aluminium oxide ceramic ball is replaced the metal grinding media in the second storehouse, the filling ratio with 32% calculates, and metal grinding media loading capacity is 160 tons originally, and the average current drain of cement is about 38kWh; Above-mentioned aluminium oxide ceramic ball is used to be 90 tons, wherein 15 tons of diameter 20mm respectively, 50 tons of diameter 30mm, 25 tons of diameter 40mm, by coordinating grinding machine manipulation, compared with metal grinding media, mill grinding efficiency is substantially identical, decrease the usage quantity of grinding aid, grinding machine is produced cement average current drain per ton and is reduced to below 34.5kWh simultaneously.The abrasion of aluminium oxide ceramic ball are 19 grams of/ton of cement.
embodiment 4
Take bauxite mine as main raw material(s), grinding to 800 order, by pressing machine compression moulding, forming pressure is 120Mpa, and compact dimensions is the forging shape of diameter 25mm, length 30mm, is fired to 1450 degree, obtained Al
2o
3content is the alumina-ceramic forging of 60wt%.The volume density of gained alumina-ceramic forging is 4.3g/cm
3, ultimate compression strength is higher than 2100Mpa, and Mohs' hardness reaches more than 7.5.
In the cement ball mill of ф 3.0 × 11m bis-storehouse, by the metal grinding media in above-mentioned obtained alumina-ceramic forging replacement second storehouse, the filling ratio with 34% calculates, and metal grinding media loading capacity is 60 tons originally, and the average current drain of cement is about 38kWh; Use alumina-ceramic forging to be 38 tons, by coordinating grinding machine manipulation, compared with metal grinding media, mill grinding efficiency is substantially identical, decreases the usage quantity of grinding aid simultaneously, and grinding machine is produced cement average current drain per ton and is reduced to below 35kWh.The abrasion of alumina-ceramic forging are 16 grams of/ton of cement.
embodiment 5
Be main raw material(s) with alumina powder, add 5% zirconia powder, combined grinding to 800 order, be formed into specified dimension by nodulizer rolling, be fired to 1550 degree, obtained Al
2o
3content is the aluminium oxide ceramic ball of 95wt%.The volume density of gained aluminium oxide ceramic ball is 3.6g/cm
3, ultimate compression strength is higher than 2500Mpa, and Mohs' hardness reaches more than 9.
In the cement ball mill of ф 3.8 × 11m bis-storehouse, above-mentioned obtained aluminium oxide ceramic ball is replaced the metal grinding media in the second storehouse, the filling ratio with 32% calculates, and metal grinding media loading capacity is 160 tons originally, and the average current drain of cement is about 38kWh; Above-mentioned aluminium oxide ceramic ball is used to be 95 tons, wherein 15 tons of diameter 20mm respectively, 60 tons of diameter 25mm, 20 tons of diameter 30mm, by coordinating grinding machine manipulation, compared with metal grinding media, mill grinding efficiency is substantially identical, decrease the usage quantity of grinding aid, grinding machine is produced cement average current drain per ton and is reduced to below 34kWh simultaneously.The abrasion of aluminium oxide ceramic ball are 9 grams of/ton of cement.
embodiment 6
Be main raw material(s) with bauxite mine, add 8% silicon nitride, grinding to 800 order, by pressing machine compression moulding, forming pressure is 100Mpa, and compact dimensions is the forging shape of diameter 20mm, length 25mm, is fired to 1500 degree, obtained Al
2o
3content is the alumina-ceramic forging of 92wt%.The volume density of gained alumina-ceramic forging is 3.9g/cm
3, ultimate compression strength is higher than 2200Mpa, and Mohs' hardness reaches more than 8.5.
In the cement ball mill of ф 3.0 × 11m bis-storehouse, by the metal grinding media in above-mentioned obtained alumina-ceramic forging replacement second storehouse, the filling ratio with 34% calculates, and metal grinding media loading capacity is 60 tons originally, and the average current drain of cement is about 38kWh; Use alumina-ceramic forging to be 35 tons, by coordinating grinding machine manipulation, compared with metal grinding media, mill grinding efficiency is substantially identical, decreases the usage quantity of grinding aid simultaneously, and the average electrical power consumption of grinding machine is reduced to below 34kWh.The abrasion of alumina-ceramic forging are 10 grams of/ton of cement.
embodiment 7
Be main raw material(s) with alumina powder, add 20% iron oxide ore micro mist, grinding to 800 order, by pressing machine compression moulding, forming pressure is 100Mpa, and compact dimensions is the forging shape of diameter 25mm, length 30mm, is fired to 1400 degree, obtained Al
2o
3content is the alumina-ceramic forging of 80wt%.The volume density of gained alumina-ceramic forging is 4.7g/cm
3, ultimate compression strength is higher than 1600Mpa, and Mohs' hardness reaches more than 7.5.
In the cement ball mill of ф 3.0 × 11m bis-storehouse, by the metal grinding media in above-mentioned obtained alumina-ceramic forging replacement second storehouse, the filling ratio with 33.5% calculates, and metal grinding media loading capacity is 60 tons originally, and the average current drain of cement is about 38kWh; Use alumina-ceramic forging to be 38 tons, by coordinating grinding machine manipulation, compared with metal grinding media, mill grinding efficiency is substantially identical, decreases the usage quantity of grinding aid simultaneously, and the average electrical power consumption of grinding machine is reduced to below 34.5kWh.The abrasion of alumina-ceramic forging are 17 grams of/ton of cement.
embodiment 8
Be main raw material(s) with bauxite, add the magnesium oxide of 5% zirconium white and 3%, grinding to 800 order, by pressing machine compression moulding, forming pressure is 120Mpa, and compact dimensions is the forging shape of diameter 25mm, length 30mm, is fired to 1550 degree, obtained Al
2o
3content is the alumina-ceramic forging of 92wt%.The volume density of gained alumina-ceramic forging is 4.0g/cm
3, ultimate compression strength is higher than 2600Mpa, and Mohs' hardness reaches more than 9.
In the cement ball mill of ф 3.0 × 11m bis-storehouse, by the metal grinding media in above-mentioned obtained alumina-ceramic forging replacement second storehouse, the filling ratio with 34% calculates, and metal grinding media loading capacity is 60 tons originally, and the average current drain of cement is about 38kWh; Use alumina-ceramic forging to be 37 tons, by coordinating grinding machine manipulation, compared with metal grinding media, mill grinding efficiency is substantially identical, decreases the usage quantity of grinding aid simultaneously, and the average electrical power consumption of grinding machine is reduced to below 34kWh.The abrasion of aluminium oxide ceramic ball are 13 grams of/ton of cement.
Claims (10)
1. for a non-metal grinding medium for cement grinding, it is characterized in that with aluminum oxide or alumina for main raw material(s), be made by batching, shaping, calcining; Al in described non-metal grinding medium
2o
3content be 50-98wt%, ultimate compression strength is higher than 1000Mpa, and Mohs' hardness reaches more than 7.
2. non-metal grinding medium according to claim 1, is characterized in that, other component also containing 2-50wt%, other described component is one or more in silicon oxide, ferric oxide, magnesium oxide, calcium oxide, silicon nitride, zirconium white and nano-powder.
3. non-metal grinding medium according to claim 1 and 2, preferred scheme is, Al in described non-metal grinding medium
2o
3content be 70-98wt%, the content of other composition is 2-30wt%, and ultimate compression strength is higher than 2000Mpa, and Mohs' hardness reaches more than 8.
4. non-metal grinding medium according to claim 3, is characterized in that, is compression moulding time shaping, and during compression moulding, pressure is 40-150MPa; Temperature during calcining is 1100-1600 DEG C.
5. non-metal grinding medium according to claim 3, is characterized in that, is that rolling is shaping time shaping, and temperature during calcining is 1100-1600 DEG C.
6. non-metal grinding medium according to claim 3, is characterized in that, described non-metal grinding medium is made into spherical or forging shape (i.e. Ceramic Balls or pottery forging); The diameter of described Ceramic Balls is 15-120mm; The diameter of described pottery forging is 10-70mm, and length is 15-70mm.
7. the application of non-metal grinding medium in cement ball mill described in claim 1 or 2.
8. application according to claim 7, is characterized in that, the filling ratio of non-metal grinding medium is in the scope of 20-50%.
9. aluminium oxide ceramic ball or pottery forging are as the application of grinding medium in cement ball mill.
10. application according to claim 9, is characterized in that, Ceramic Balls or the filling ratio of pottery forging in cement ball mill are 20-50%; Ceramic Balls or pottery forging in Al
2o
3content be 70-98wt%, the content of other compositions is 2-30wt%.
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