Introduction of high calcined bauxite bauxite is. Before brick bauxite calcined generally required to obtain a clinker, that is barren of material. In this material as an ingredient in the aggregate, can ensure a stable product size and dimensions accurate. China's bauxite, mostly D-K type, during calcination subject to decomposition dehydration, and severe secondary mullitization polycrystalline sintered three phases. (See bauxite) calcined mineral composition according to the ratio of the different materials in the formation of corundum Al2O3 and SiO2, mullite and glass phase. Bauxite is gray, yellow and dark gray. High bauxite is mainly used to produce high alumina refractories, can also be used to produce fused corundum. The two main factors that influence high sintered bauxite is mullitization and liquid secondary role. The former depends on Al2O3 / SiO2 ratio, sintering obstructive role; the latter play a role in promoting the sintering. In addition, Fe2O3 and TiO2 enter solid corundum and mullite lattice phase reaction, but also play a supporting role in the promotion of sintering. In 1200 ~ 1400 ℃, secondary mullite cause expansion, the main role is to hinder sintering; above 1400 ℃, secondary mullitization reaction is substantially complete, the liquid phase to promote the dissolution-precipitation process of the crystal grains, resulting in densification, At this time, the main role of promoting the sintering. Ⅱ grade bauxite Al2O3 / SiO2 ratio is close to 2.55, just a mullite composition region, generating secondary mullite maximum amount of stone, the hardest sintering. High alumina sintering temperature levels are as follows: grade for 1600 ~ 1700 ℃, I level is 1500 ~ 1600 ℃, Ⅱ level is 1600 ~ 1700 ℃, Ⅲ level is 1500 ~ 1550 ℃. Calcined bauxite usually kiln, vertical kiln, there is also down draft kiln calcination. About Us Yangquan positive element Refractories Co., Ltd. located in the famous village of refractories - Yangquan. Local rich bauxite, is one of China's largest production base of refractories. Founded in 1995, 16 million yuan in fixed assets, the annual output of 20,000 tons. The company's advanced automated production equipment, gas sintering process and improve the service in the industry counterparts enjoyed a high reputation, and was awarded the units of energy saving pacesetter companies. Our main products are high alumina bricks, high alumina insulating bricks, high alumina semi-insulating bricks, clay, clay insulation bricks, insulation bricks diatomite, perlite insulation tiles and other specifications of various monolithic refractories; castable, ramming unshaped refractories hot fill material, plastic, spray paint, refractory mortar, such as different grades; bauxite (raw material, clinker, aggregates, powder), homogenized material, silica, quartz, feldspar different levels of fire-resistant materials. Enterprise products sold throughout the country and exported to Europe, America, Japan and Korea. We adhere to honesty, quality products, perfect service, cross-world friends.