Cheap Alumina Abrasive Manufacturers Australia

After loading the aluminium oxide abrasive grit above firing bowl into the tunnel kiln for secondary calcination, the process is as follows: temperature rise zone 200-1250 ℃, calcination for 4-6 hours; heat preservation zone 1250-1280 ℃, calcination for 2-4 hours; cooling zone 1280-100 ℃, 9-11 hours, exit kiln cooling to normal temperature, screening and packaging to obtain the finished fused aluminum oxide product.

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Before calcination, the crystal image of brown fused alumina is columnar, coarse and short. The production process adopts the following technical scheme: including the following steps: put the brown corundum abrasive 16 × 1-240 × 3 into silicon carbide burners respectively according to the particle size, enter the tunnel kiln for calcination, and the black synthetic corundum calcination temperature is from 200-800 ℃ for 2-4 hours, then push the kiln car out of the tunnel kiln for natural cooling to normal temperature.

(cheap alumina abrasive manufacturers australia)Enter the aluminium oxide blasting grit abrasive blower dry cleaner for screening, and re install the silicon carbide burners for burning; In the second step, the heat preservation belt is calcined at 1250-1280 ℃ for 3 hours. In the second step, the cooling belt is 1280-100 ℃ for 10 hours. The above calcined corundum abrasives have the following characteristics: the toughness and sharpness of the abrasives have been greatly improved; the artificial corundum calcined abrasives are loose and do not form plates.

brown aluminum oxide is produced by reduction of Calcined Bauxite in an electric arc furnace. In the first step, the calcination temperature is from 200 to 800 ℃ for 3 hours. In the second step, the temperature rise zone is 200-1250 ℃, and the roasting time is 5 hours. so as to completely eliminate the internal stress and dark cracks caused by quenching and mechanical crushing in the production process of corundum; After calcination, the width of aluminum oxide blasting abrasive crystal image becomes narrower and the shape of slender column.(cheap alumina abrasive manufacturers australia)

Specifically, the grinding ratio of? The dark crack before calcination of corundum is repaired, the fiber density is enhanced and the wear resistance is improved. The calcined brown corundum produced by this process can improve the abrasives' hydrophilicity, cleanliness, wear resistance and sharpness by 50%. Type consolidated grinding tool is increased by 50-70% compared with that before calcination, synthetic corundum price from 1:10 to 1:15; the cutting efficiency of resin slice is increased by 30-40%.

(cheap alumina abrasive manufacturers australia)The process can be widely used in the brown aluminium oxide of consolidated abrasives, coated abrasives and ceramic abrasives, especially the resin bonded abrasives, with the grinding performance improved by 50-70%. How to make brown corundum meet such requirements, we must first understand how the impurities in the aluminum oxide abrasive blasting grit chemical composition can improve or reduce its quality. Coke and coal are two carbon sources commonly used as reducers. 

It is formed by the addition of organic diisocyanate or polyisocyanate with a 150 grit aluminum oxide compound of two or more light groups. In smelting process, excessive impurities (iron oxide, silica and titanium oxide) in Calcined Bauxite are reduced to metal. The reduction process of impurities to metals is as follows: Fe2O3 + 3C → 2Fe + CO → SiO2 + 2C → Si + 2CO → TiO2 + 2C → Ti + 2CO. The excess iron added in the furnace charge and the reduced 100 grit aluminum oxide blast media metal impurities form ferrosilicon alloy.(cheap alumina abrasive manufacturers australia)