What is Alumina?
Alumina. Chemical formula Al2O3. The ionic crystalline compound is used for refractory materials.

Diaspore and bauxite are used as raw materials to make industrial alumina. Al2O3 with high purity is prepared by a chemical method. Al2O3 contains many isomorphous crystalline forms. Currently, there are over 10 different types of crystals. They have different properties. At temperatures above 1300 deg C, they are almost completely transformed into a - Al2O3.

Modified alumina of ultra high purity with rare earths

Shanghai Jiaotong University has put in operation the pilot project of rare Earth modified high-purity sapphires, independently developed and researched by its R&D group. For the first time, alumina high purity products with 5N purity (greater than 99.999%) were produced on this production line. The high-purity product is the top-end of the aluminum industry, and it's the primary raw material for artificial sapphire. The new project is a replacement for the lack of a high-purity international aluminum preparation technology. It will also complete the entire line in the industrial chain for high-purity Aluminum and artificial sapphire.

The R&D team in China has created the first ultra-high purity aluminum purification technology and equipment that is protected by complete intellectual property rights. Professor Zhang Wei is the team leader. He said that this new technology combines the purification of high-purity aluminium with a new material preparation process for rare earth. The addition of rare Earth not only improves the toughness but also the color brightness and hardness. Now that the technology has improved greatly, it is possible to produce 5N ultrahigh-purity and 6N ultrahigh-purity ingots.
According to the current understanding, high-purity aluminium hydrolysate with a purity of at least 5N is used as the primary raw material in producing single-chip sapphire-LED substrates. Sapphire is the substrate of choice for more than 90 percent of LED manufacturers worldwide. High-purity Alumina is also widely utilized in the manufacture of lithium battery separators materials, high end phosphors catalysts and semiconductor ceramics.

Pan Tianlong said that this new product wasn't available on the marketplace. Our ultra high purity aluminum ingots close the gap in production technology. The aluminum industry is our upstream. Chain, downstream the artificial sapphire chain. First time, this product connects these two industrial chains seamlessly. Next, we'll gradually move products onto mobile phone screens, high-end camera lenses, and ceramic targets. And many other production uses."

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