Molecular Formula | Al2H2O4 |
Molar Mass | 119.976556 |
What is bauxite | alumina is mainly composed of hydrated alumina, which is an aluminum ore. Often because of containing iron oxide and yellow. Alumina is an important refractory material, widely used in the metallurgical industry. Refractory industry, the bauxite is usually referred to after calcination Al2O3 is greater than or equal to 48%, and low Fe2O3 containing bauxite, high bauxite clinker is Calcined Bauxite. High alumina bauxite clinker is based on the content of Al2O3 and Fe2O3, TiO2, CaO, MgO, K2O, Na2O and other impurities and clinker volume density and water absorption and other indicators to grade. Potassium, sodium, iron, calcium, silicon, magnesium, titanium and other elements are harmful impurities, affecting the quality of alumina refractory. Due to the presence of these elements, the refractory material is reduced in refractoriness and is not resistant to corrosion. The main minerals of bauxite clinker are aluminite and High Alumina Silica. The content of boehmite increases with the increase of the ratio of alumina to silica. The secondary minerals are rutile, unlesiderite, etc. Sometimes also contains a small amount of pomite and diconite. According to the high bauxite containing three aluminum, the general can be divided into 3 grade 5, its content and color are: More than 85% soil gray or dark gray of Grade I 75-85% soil gray or dark gray of Grade I 65-75% White Gray of Grade II 50-65% cyan Gray of Grade III the grade four bauxite clinker with 50% or less cyan belongs to sedimentary deposits, it is divided into soil-derived and stone vein minerals. The Earth-born ore, the top of which is covered with hard red clay, with a thick soil layer of limestone, is called "Grain Ginger Stone". The ore body is produced in layers, with a relatively large area, which can reach several Li long along the direction. The thickness of the ore body is generally 3-4 m, and the thickness of the ore body is more than 7-9 M. The material is pure and the structure is hard and dense. The vein ore is covered by limestone, with a relatively small area, with a socket-like output, generally ranging from several tens of meters to several tens of meters, sometimes mixed with limestone, with a layer of fine red glue in the middle, the material is coarse and less pure. |
Main purpose | (1) aluminum smelting industry. For national defense, aviation, automotive, electrical, chemical, daily living supplies. (2) precision casting. The bauxite clinker is processed into fine powder to be cast and then precision cast. Used in military, aerospace, communications, instrumentation, machinery and medical devices sector. (3) for refractory products. High alumina bauxite clinker refractoriness up to 1780 ℃, chemical stability, good physical properties. (4) aluminosilicate refractory fiber. It has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, small heat capacity and mechanical vibration resistance. Used in iron and steel, nonferrous metallurgy, electronics, petroleum, chemical, aerospace, atomic energy, national defense and other industries. It is the high-aluminum clinker into the melting temperature of about 2000~2200 ℃ in the high-temperature electric arc furnace, high-temperature melting, high-pressure high-speed air or steam blowing, cooling, became a white "cotton"-aluminum silicate refractory fiber. It can be pressed into a fiber blanket, board or woven fabric instead of smelting, chemical, glass and other industrial high-temperature kiln lining refractory bricks. Fire-fighting personnel can use fire-resistant fiber cloth to make clothes. (5) with magnesia and bauxite as raw materials, adding appropriate Binder, the effect of the whole barrel lining for pouring steel barrel is very good. (6) the manufacture of alumina cement, abrasive materials, ceramic industry and chemical industry can produce a variety of compounds of aluminum. |
difference between raw bauxite and cooked bauxite | the raw materials are kaolinite and aluminite, and the clinker is mullite. Bauxite clinker, referred to as high-alumina material, and a variety of high-alumina bricks made from its clinker, is widely used as a refractory or anti-corrosion material in the metallurgical industry and other industries, especially the top of the electric furnace, blast furnace and hot blast stove. The fire resistance effect is very significant, and the performance is better than that of ordinary clay refractory brick. |