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- WhatsApp:+86 15201419716
- Telephone:+86 15201419716
- Company Address:Zhongjing Industrial Park, Ciyao Town, Tai'an City, Shandong Province China
PRODUCTS
Product Properties
Aluminum oxide, commonly known as bauxite, has the chemical formula Al₂O₃. It is a white powder that is refractory and insoluble in water. Its melting point is 2015 °C, its boiling point is 2980 °C, its relative density is 4.0, and its Mohs hardness is 8.8. It has different crystal forms, mainly two variants, α and γ. Alumina can be obtained by heating and dehydrating aluminum hydroxide. The α-form of aluminum oxide existing in nature is called corundum. Its hardness is second only to that of diamond. A small amount of impurities mixed in can give corundum various colors, and it is called gemstone. For example, ruby (containing a small amount of Cr³⁺) and sapphire (containing Ti³⁺ and Fe²⁺, Fe³⁺). Now, gemstones can be manufactured by the method of artificial crystallization of molten aluminum oxide.
Quality index
| Item | Calcined Alumina | Uncalcined Alumina |
| Appearance | White power | White power |
| Al2O3（%） | ≥99.5 | ≥98.5 |
| SiO2（%） | ≤0.1 | ≤0.02 |
| Fe2O3 （%） | ≤0.04 | ≤0.02 |
| Na2O（%） | 0.10-0.30 | ≤0.50 |
| L.O.I（%） | ≤0.2 | ≤1.0 |
α-Al2O3（%） | ≥94 | |
| Particle size (D50) | 4-6 | |
| Others（%） |
Application
Packing
50kg/bag;1500kg/bag