防火耐火材料鑄造等用多功能鋁礬土

防火耐火材料鑄造等用多功能鋁礬土 

 礬土又稱礬土或鋁土礦，主要成分是氧化鋁，系含有雜質的水合氧化鋁，是一種土狀礦物，白色或灰白色，因含鐵而呈褐黃或淺紅色。密度2.4-2.5g/cm3，硬度1～3，不透明，質脆，極難熔化，不溶于水，能溶于****溶液，主要用于煉鋁，制耐火材料。 耐火材料行業所稱的鋁礬土通常是指煅燒后Al2O3>=48%、而含Fe2O3較低的高鋁礬土熟料。熟料為灰白淺黃及深灰色，它主要用于高鋁質耐火材料，也可用來制作電熔棕剛玉。高鋁礬土熟料是按AL2O3含量及Fe2O3、TiO2、CaO+MgO、K2O+Na2O等雜質含量和熟料體積密度與吸水等項指標來分級的。
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） 煉鋁工業--用于國防、航空、汽車、電器、化工、日常生活用品等。
（2） 精密鑄造--礬土熟料加工成細粉做成鑄模后精鑄，用于軍工、航天、通訊、儀表、機械及醫療器械部門。
（3）用于耐火制品--高鋁礬土熟料耐火度高達1780℃，化學穩定性強、物理性能良好。
（4）硅酸鋁耐火纖維--具有重量輕，耐高溫，熱穩定性好，導熱率低，熱容小和耐機械震動等優點。用于鋼鐵、有色冶金、電子、石油、化工、宇航、原子能、國防等多種工業。它是把高鋁熟料放進融化溫度約為2000～2200℃的高溫電弧爐中，經高溫熔化、高壓高速空氣或蒸汽噴吹、冷卻**成了潔白的“棉花”——硅酸鋁耐火纖維。它可壓成纖維毯、板或織成布代替冶煉、化工、玻璃等工業高溫窯爐內襯的耐火磚。消防人員可用耐火纖維布做成衣服。
（5） 以鎂砂和礬土熟料為原料，加入適當結合劑，用于澆注盛鋼桶整體桶襯效果甚佳。
（6）制造礬土水泥，研磨材料，陶瓷工業以及化學工業可制鋁的各種化合物。
(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.