防火耐火材料铸造等用多功能铝矾土

防火耐火材料铸造等用多功能铝矾土 

 矾土又称矾土或铝土矿，主要成分是氧化铝，系含有杂质的水合氧化铝，是一种土状矿物，白色或灰白色，因含铁而呈褐黄或浅红色。密度2.4-2.5g/cm3，硬度1～3，不透明，质脆，极难熔化，不溶于水，能溶于****溶液，主要用于炼铝，制耐火材料。 耐火材料行业所称的铝矾土通常是指煅烧后Al2O3>=48%、而含Fe2O3较低的高铝矾土熟料。熟料为灰白浅黄及深灰色，它主要用于高铝质耐火材料，也可用来制作电熔棕刚玉。高铝矾土熟料是按AL2O3含量及Fe2O3、TiO2、CaO+MgO、K2O+Na2O等杂质含量和熟料体积密度与吸水等项指标来分级的。
Bauxite,the main component is alumina, system containing impurities of hydrated alumina, a kind of earthy minerals, white or grey, due to iron and brownish yellow or light red. The density of 2.4-2.5g/cm3, hardness 1 ~ 3, opaque, crisp, very difficult to melt, insoluble in water, soluble in sulfuric acid, sodium hydroxide solution, mainly used in aluminum smelting, refractory material. Bauxite refractories industry called usually refers to the calcined Al2O3> =48%, and Fe2O3 containing low bauxite clinker. Clinker as gray yellow and dark gray, it is mainly used for high aluminum refractory material, also can be used for making fused corundum. High alumina bauxite is according to the AL2O3 content and Fe2O3, TiO2, CaO+MgO, K2O+Na2O and other impurity content and bulk density and water absorption of clinker and other items to grading.

（1） 炼铝工业--用于国防、航空、汽车、电器、化工、日常生活用品等。
（2） 精密铸造--矾土熟料加工成细粉做成铸模后精铸，用于军工、航天、通讯、仪表、机械及医疗器械部门。
（3）用于耐火制品--高铝矾土熟料耐火度高达1780℃，化学稳定性强、物理性能良好。
（4）硅酸铝耐火纤维--具有重量轻，耐高温，热稳定性好，导热率低，热容小和耐机械震动等优点。用于钢铁、有色冶金、电子、石油、化工、宇航、原子能、国防等多种工业。它是把高铝熟料放进融化温度约为2000～2200℃的高温电弧炉中，经高温熔化、高压高速空气或蒸汽喷吹、冷却**成了洁白的“棉花”——硅酸铝耐火纤维。它可压成纤维毯、板或织成布代替冶炼、化工、玻璃等工业高温窑炉内衬的耐火砖。消防人员可用耐火纤维布做成衣服。
（5） 以镁砂和矾土熟料为原料，加入适当结合剂，用于浇注盛钢桶整体桶衬效果甚佳。
（6）制造矾土水泥，研磨材料，陶瓷工业以及化学工业可制铝的各种化合物。
(1)aluminum industry - for defense, aerospace, automotive, electrical, chemical, and other daily necessities.
(2) Casting - bauxite processed into powder after casting mold made for military, aerospace, communications, instrumentation, mechanical and medical device sectors.
(3) for refractory products - high bauxite refractoriness up to 1780 ℃, chemical stability, good physical properties.
(4) aluminosilicate refractory fibers - light weight, high temperature resistance, good thermal stability, low thermal conductivity, heat capacity of small and resistance to mechanical vibration and so on. For iron and steel, non-ferrous metallurgy, electronics, petroleum, chemical, aerospace, nuclear, defense and other industries. It is put into the high alumina clinker melting temperature of about 2000 ~ 2200 ℃ high temperature electric arc furnaces, high temperature melting, high pressure high velocity air or steam blowing, cooling, became white "cotton" - aluminum silicate refractory fibers. It can be pressed into fiber blanket, sheet or woven into cloth instead of smelting, chemicals, glass and other industrial high-temperature furnace refractory lining. Firefighters made available refractory fiber cloth clothes.
(5) to magnesite and bauxite as raw material, adding an appropriate binder, for pouring ladle lining the overall effect is very good barrel.
(6) producing alumina cement, abrasive materials, various compounds ceramic industry and chemical industry can be made of aluminum soil.