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Aluminum Sulfate
Aluminum sulfate is a commonly used industrial chemical.
It is known as filter alum. The compound of aluminium, sulfur, and oxygen is often a dry, crystalline, powdery substance that becomes slimy when wet and is not combustible.
Aluminum Sulfate is a water-soluble, odourless, white crystalline compound with the chemical formula Al2(SO4)3 and CAS 10043-01-3.
It has a sweet, mildly astringent taste and is insoluble in ethanol. It may burn, but it will not ignite.
Other names of Aluminum sulfate are: Aluminum Sulphate, Cake Alum, Filter Alum, Papermaker’s Alum, Alunogenite, aluminum salt.
It is soluble in water and is mainly used as a coagulating/flocculating agent in the purification of drinking water and waste water treatment plants, and also in paper manufacturing.
Aluminum Sulphate is rarely, if ever, encountered as the anhydrous salt. It forms a number of different hydrates, of which the octa decahydrate Al2(SO4)3•18H2O is one of the most common types.
Both forms are soluble in water, noncombustible, and nontoxic.
The tetra octahydrate Al2(SO4)3•14H2O (Alum) is commercially the best quality of Aluminum Sulphate in terms of effectiveness which has the average w/w ratio of Al2O3, of 17% – compared to 14% in octa decahydrate composition.
Alum is commercially available in solid (kibbled, crushed, or powder) and liquid (50% w/w solution) forms.
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