white carborundum
Post on 15-Apr-2017
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White Fused Alumina
White corundum is produced from alumina by melting in the electric arc furnace.Color : whiteMohs hardness: 9Crystal shape :trigonal system, Chemical component :Al2O3 > 99%, Little amount of Sio2, Fe2O3, Na2O.
Main application: abrasives, refractories, polishing, sandblasting purp
oses.
Smelting
There are two ways of smelting method:Fixed FurnaceTilting Furnace
color Smelting time
Hardness
Fixed Furnace
white short good
Tilting Furnace
white but dark
long better
Tilting Furnace
Fixed Furnace
Manufacturing of grains
Grain size:
F standard F4-F220 P12-P220
Section sand: 0-1mm, 1-3mm,3-5mm, 5-8mm
Finer: 200#,325#
White corundum block → coarse crushing → ball mill or roller machine (the grain shape
depends on the manufacturing technique, the ball mill better than roller machine)→magnetic
separation →screening particle size (vibration sieve) → sampling test particle size distribution
→bagging finished products
• Nature Cooling Breaking
First Crushing
• Jaw Crusher
Fine Crushing
• Twin Roller
Fine Crushing
• Ball Mill
Sieving
Screening equipment: Coarse Fraction, magnetic seperation, sieving the needed size
Micropowder
Micro Size: F230-F1200, P240-P2500, JIS240-JIS8000, W63-W5
Method: White fused aluminum oxide fines→ball mill→air segment→acid-alkali
washing→water washing→select the particle size( water effusion)→ stoving
→loosen→finshed micopowder
Water Effusion
Introduction of method on selecting micropowder
• Principle of water effusion:Hydraulic impulse
• The lower the hydraulic pressure is, the finer the size will be. Accordingly the higher the hydraulic pressure is, the coarser the size will be.
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