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ammonia aluminium oxide, also known as alum, is an aluminium compound with the chemical formula Al(OH)3. It is a white solid which is soluble in water and alcohol. It has a low melting point, high hardness, and excellent corrosion resistance. It is the primary ingredient in glass manufacture, and is used for abrasives and gems such as rubies and sapphires, which get their distinctive colour from trace impurities like iron.
It is commonly found in aluminium smelters and alloy production, as well as being an ingredient in various pharmaceutical products and cosmetics. It is approved by the European Union (Eu) as an antacid drug and against hyperphosphataemia, and the Food and Drug Administration of the United States (FDA) permits it as an indirect food additive. It is used under a variety of brand names such as Alamag(r), Maalox(r), Alternagel(r) and Dialume(r). It is an inert dust with low toxicity, although when inhaled it can cause irritation to the respiratory tract and eyes.
The present invention relates to a process for preparing aluminium oxide, which utilizes ammonia decomposition of an alum liquor to obtain a granular alumina product. This method includes mixing grog, crushing and grinding it, adding ammonia, decomposition of the alum liquor, obtaining aluminium hydroxide, roasting granular alumina to obtain aluminium oxide. The method has the advantage of avoiding waste material and reducing processing time. Moreover, the process can be done by simple operation and equipment. The invented method can provide a simple, effective and economical process for preparing aluminium oxide.