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.