煅烧氧化铝是白色无定形粉末，密度3.9-4.0g/cm3，熔点2050℃、沸点2980℃，不溶于水，为两性氧化物，能溶于无机酸和碱性溶液中，主要有α型和γ型两种变体，工业上可从铝土矿中获取。
氧化铝粉可用于：剖析试剂、有机溶剂的脱水、吸附剂、有机反响催化剂、研磨剂、抛光剂、冶炼铝的质料、耐火材料。
α型氧化铝不溶于水和酸，工业上也称铝氧，是制金属铝的根本质料；也用于制各种耐火砖、耐火坩埚、耐火管、耐高温试验仪器；还可作研磨剂、阻燃剂、填充料等；高纯的α型氧化铝仍是出产人工刚玉、人工红宝石和蓝宝石的质料；还用于出产现代大规模集成电路的板基。
γ型氧化铝是氢氧化铝在140-150℃的低温环境下脱水制得，工业上也叫活性氧化铝、铝胶。γ型氧化铝不溶于水，能溶于强酸或强碱溶液，将它加热至1200℃就全部转化为α型氧化铝。工业品常为无色或微带粉红的圆柱型颗粒，耐压性好。在石油炼制和石油化工中是常用的吸附剂、催化剂和催化剂载体；在工业上是变压器油、透平油的脱酸剂，还用于色层剖析；在试验室是中性强枯燥剂，其枯燥才能不亚于五氧化二磷，使用后在175℃以下加热6-8h还能再生重复使用。
Calcined alumina is white amorphous powder with density of 3.9-4.0g/cm3, melting point of 2050 ℃, boiling point of 2980 ℃, insoluble in water, amphoteric oxide, soluble in inorganic acid and alkaline solution, mainly composed of α Type and γ It can be obtained from bauxite in industry.
Aluminum oxide powder can be used for: analysis reagent, dehydration of organic solvent, adsorbent, organic reaction catalyst, abrasive, polishing agent, aluminum smelting material and refractory.
α Alumina is insoluble in water and acid. It is also called aluminum oxide in industry and is the basic material for making metal aluminum; It is also used for making all kinds of refractory bricks, refractory crucibles, refractory pipes and high temperature resistance test instruments; It can also be used as abrasives, flame retardants, fillers, etc; High purity α Al 2O 3 is still used to produce artificial corundum, ruby and sapphire; It is also used to produce modern large scale integrated circuit board.
γ Type a alumina is prepared by dehydration of aluminum hydroxide at 140-150 ℃ in low temperature environment. It is also called active alumina and aluminum glue in industry. γ Alumina is insoluble in water, but soluble in strong acid or alkali solution. When it is heated to 1200 ℃, it is completely converted into alumina α Type alumina. Industrial products are usually colorless or pinkish cylindrical particles with good pressure resistance. It is commonly used as adsorbent, catalyst and catalyst carrier in petroleum refining and petrochemical industry; In industry, it is a deacidification agent for transformer oil and turbine oil, and also used for chromatographic analysis; In the laboratory is a neutral strong boring agent, its boring ability is no less than phosphorus pentoxide, after use at 175 ℃ heating for 6-8h can be recycled.
客服1