white carborundum
TRANSCRIPT
![Page 1: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/1.jpg)
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.
![Page 2: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/2.jpg)
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
![Page 3: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/3.jpg)
Tilting Furnace
![Page 4: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/4.jpg)
Fixed Furnace
![Page 5: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/5.jpg)
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
![Page 6: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/6.jpg)
• Nature Cooling Breaking
![Page 7: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/7.jpg)
First Crushing
• Jaw Crusher
![Page 8: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/8.jpg)
Fine Crushing
• Twin Roller
![Page 9: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/9.jpg)
Fine Crushing
• Ball Mill
![Page 10: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/10.jpg)
Sieving
Screening equipment: Coarse Fraction, magnetic seperation, sieving the needed size
![Page 11: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/11.jpg)
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
![Page 12: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/12.jpg)
Water Effusion
![Page 13: White Carborundum](https://reader036.vdocument.in/reader036/viewer/2022062503/5876b9221a28abad1a8b66fd/html5/thumbnails/13.jpg)
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.