铝是地壳中最常见的一种金属元素。自然界中,铝以铝矾土、冰晶石、尖晶石、正长石、白云母、霞石、明矾石和其它复合铝硅酸盐或膨润土形式存在,从不以金属形式存在。1985年,全世界铝矾土开采量为7630万吨,铝金属产量为1500万吨。由于铝耐腐蚀、质轻、导热性能好等优点,故广泛用于建筑材料、炊具、颜料、涂料、火箭燃 Aluminum is the most common type of metal in the crust. In nature, aluminum is present in the form of bauxite, cryolite, spinel, orthoclase, muscovite, nepheline, alunite and other complex aluminosilicates or bentonites and never exists in metallic form. In 1985, the world’s bauxite mining 76.3 million tons, aluminum metal production of 15 million tons. Because of aluminum corrosion-resistant, light weight, good thermal conductivity, it is widely used in building materials, cooking utensils, paint, paint, rocket burning