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type of product: |
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White Corundum,
sizing F22 – F220 |
ABRASIVE GRAINS OF WHITE CORUNDUM
sizing F22 – F220
1. White Corundum is
produced by fusing of clean Al2O3 in electrical arc
furnace. After crushed it and milled it on ball mills, arised
corundum grains are several times magnetized and sieved according to the sizes.
2. Chemical compound:
- is made at grain F40
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guaranteed analysis |
typical analysis |
| Al2O3 |
99,20 % min. |
99,50 % |
| Fe2O3 |
0,12 % max. |
0,07 % |
| SiO2 |
0,10 % max. |
0,056 % |
| CaO |
0,10 % max. |
slight |
| Na2O |
0,28 % max. |
0,21 % |
| loss by ignition |
0,20 % max. |
0,15 % |
3. Physical poperties:
3.1. Magnetic
separation
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F22 – F90 |
F100 – F150 |
F180 – F220 |
| magnetic separation |
0,10 % max. |
0,20 % max. |
0,20 % max. |
| metal particulares |
0,001 % max. |
0,002 % max. |
0,008 % max. |
3.2. Bulk density
| granulation |
g/dm3 min. |
granulation |
g/dm3 min. |
| F22 |
1710 |
F70 |
1590 |
| F24 |
1710 |
F80 |
1570 |
| F30 |
1700 |
F90 |
1530 |
| F36 |
1680 |
F100 |
1510 |
| F40 |
1680 |
F120 |
1500 |
| F46 |
1660 |
F150 |
1480 |
| F54 |
1660 |
F180 |
1460 |
| F60 |
1640 |
F220 |
1440 |
3.3. Granulation
Granulation compound of grains 99 A I
b F22 to F 220 has to meet requirements FEPA standard
42-D-1984. After agreement there is also a possibility to supply grainmixtures
in framework of technological possibilities.
3.4. Colour – white.
4. Usage:
a) production of white even colour grinding tools and
instruments with ceramic, resinous, magnesite, shellac and rubber binder
b) production of refractory blocks, bricks, cements, ceramic pouches,
catalyzers and compacting mixtures
c) dishing up in free form, drum, vibrating - removal of fraies
d) special blasting of different materials and products
e) production of filters and diffusion nozzles
f) grinding and lappeding of materials with free grains
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WHAT TO GRIND? |
| Hardness |
Material |
| 1 |
talc |
| 2 |
rock-salt |
| 3 |
calcite |
| 4 |
fluorite |
| 5 |
apatite |
| 6 |
feldspar |
| 7 |
flint |
| 8 |
topaz |
| 9 |
corundum |
| 9,5-10 |
silicon carbide |
| 10 |
diamond |
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THE HARDNESS
SCALE of MOHSOV
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HARDNESS Mohs |
| Material |
Hardness |
| Tin |
1,8 |
| Graphite |
1,2 |
| Aluminium |
2,9 |
| Chromium |
9 |
| Cobalt |
5,5 |
| Silicon |
7 |
| Copper |
3 |
| Brass |
3,5-4 |
| Marble |
3-4 |
| Nickel |
3,8 |
| Steel |
5-8,5 |
| Lead |
1,5 |
| Wax 0°C |
0,2 |
| Zinc |
2,5 |
| Gold |
2,5 |
| Iron |
4,5 |
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METALLURGY |
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Silicon
carbide is used in foundry in various forms and its usage has been
known for many years. In the United States of America was
established ... more
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