Various types of high-alumina segments Yangquan Zhengyuan supply

 Bauxite Summary: bauxite (aluminous soil; bauxite), also known as alumina or bauxite, the main ingredient is alumina, alumina hydrate system containing impurities, is a earthy minerals. White or gray, because iron and brownish yellow or reddish. Density 3.9 ~ 4g / cm3, hardness 1-3, opaque, brittle. Extremely difficult to melt. Insoluble in water, soluble in sulfuric acid, sodium hydroxide solution. Mainly used for aluminum smelting, manufacture refractories. Refractory bauxite industry usually refers to the alleged calcined Al2O3> = 48%, while containing less Fe2O3 bauxite, bauxite clinker is calcined bauxite. Light yellow and dark gray for the gray clinker, which is mainly used for high alumina refractories, also be used to make fused corundum. Bauxite division level criteria: high bauxite is by AL2O3 content and Fe2O3, TiO2, Ca O + Mg O, K2O + Na2O and other impurities and clinker bulk density and water absorption and other indexes to classification. Bauxite species, levels: (1) raw alumina, which alumina raw ore (natural sedimentary rocks). (2) cooked bauxite, the raw bauxite after calcination (1200 ~ 1700 ℃) called cooked bauxite. After bauxite calcination, its physical and chemical properties change as follows: 1, the appearance of the original gray, dark gray, gray and yellow, gray, red, yellow and other colors into white, beige, brown, red, blue, and blue with the aluminum content increased and deepened. The original earthy luster becomes corundum oil sheen or gloss, sometimes slight surface melting rock or crack; 2, alumina content increased from 11 to 13 percent, increasing the amount of micro other impurities; 3, the volume is reduced about 23%; 4, loss on ignition of about 14.5%; 5, by a stone or a water-in-water aluminum aluminum - kaolinite type, into artificial corundum, mullite and a small amount of glass phase; 6, the hardness increased from 1 to 3 to 8 or more; 7, the bulk density was increased from about 2.5g / cm3 to 2.8 ~ 3g / cm3 or more; 8, crystal water, structure of water, all the water overflow attachment; 9, the structure consists of sparse, loose, soft becomes dense hard; 10, lower water absorption; slag resistance, alkali resistance enhancement; 12. strength increase; 13. reduce permeability; 14. gasification rate reduction; 15. volatile components, flammable components, soil odor completely disappeared; 16. refractoriness over 1780 ℃. (3) cooked bauxite calcination kiln according to different divided into: ① furnace cooked bauxite (SHAFT KILN BAUXITE); ② cooked converter alumina (ROTARY KILN BAUXITE); ③ down draft kiln bauxite (ROUND KILN BAUXITE). (4) different uses cooked bauxite divided into: ① refractory grade bauxite; ② abrasive grade bauxite; ③ welding grade bauxite. Bauxite test indicators: (1) high-alumina (containing more than Al2O385%) requires inspection items: Al2O3: refractory grade 85 to 87% above the level of 86% grinding, welding and above 87%; SiO2: refractory grade 6 to 7% or less, grinding stage 5 to 6%; Fe2O3: refractory grade 1.6 to 2% or less, wear-level of 2% or less; TiO2: refractory grade 3.5 to 4% or less, grinding stage 4 to 4.5% or less; K2O + Na2O + CaO + MgO: refractory grade 0.5 to 1% or less, grinding stage 0.5 to 1% or less. Welding grade bauxite and some also require inspection phosphorus, sulfur, manganese and other projects. BD (bulk density): refractory grade 3.10 ~ 3.20g / cm3 or more, ground level, welding is not required to examine the project level. L.O.I (loss on ignition): of 0.3% or less. Size: according to buyers' requirements to develop, usually there is a natural block, 100mm, 50mm, 25mm, 10mm, 5mm, 3mm, 1mm like. Moisture: generally between 0.5 to 1.5 percent, exceeding the tare or other terms. (2) General alumina (containing more than Al2O380%) requirements for test items: refractory grade: not less than Al2O3: 80%; Fe2O3: not more than 2%; BD: not less than 2.8g / cm3; particle size and moisture according to buyer requirements to develop . In addition, the size of the contract signed for the fines, generally require between 100 to 200 mesh through rate of 85% to 90%. (3) bauxite requires inspection items: Al2O3: not less than 80%; Fe2O3: 4 ~ 10%; TiO2: not more than 4%; SiO2: not more than 7%, particle size: according to buyer requirements to develop. (4) testing requirements raw bauxite project:  Al2O3: 70 ~ 73%; Fe2O3: about 1.5%; TiO2: not more than 4%; SiO2: not more than 6%; loss on ignition: 14 ~ 15%; K2O + Na2O + CaO + MgO = 0.5 ~ 1%. Yangquan Zhengyuan Refractories Co., Ltd. located in the famous township refractory materials - Yangquan, Shanxi. Local rich bauxite, is one of China's largest production base of refractories. Founded in 1995, the fixed assets of 16 million yuan, the annual output of 20,000 tons. Companies with advanced automated production equipment, gas sintering technology and perfect after-sale service in the industry counterparts enjoyed a high reputation, and relevant units as energy saving model enterprise. The company's main products are high alumina bricks, high alumina insulating bricks, high aluminum semi-insulating bricks, clay bricks, clay insulation bricks, insulation bricks diatomite, perlite insulation tiles and other specifications of various monolithic refractories; castable, ramming mixes unshaped refractory hot fill material, plastic, spray paint, fire-resistant mud, 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 Japan and South Korea to Europe. We adhere to honesty, quality products, perfect service, cross-world friends.