以各种铝土矿用拜耳法生产氧化铝的工厂，尤其是采用美国设计的焙烧炉的氧化铝厂，如ＳａｎＣｉｐｔｉｎ（Ｌｕｇｏ，西班牙）厂，在生产冶金用氧化铝的同时；也产出一定数量的氧化铝微粉。若不将其分离出来而直接用于电解，将会给电解操作过程带来麻烦。本文叙述了用Ａｌ＿ｚＯ＿３微粉（≤４３μｍ）制取高价值的耐火材料和陶瓷制品，如莫来石和不同Ｎａ＿２Ｏ含量的特种氧化铝。 Alumina plants produced by Bayer process with various bauxites, especially alumina plants using US-designed roaster, such as the San Ciptin (Lugo, Spain) plant, produce metallurgical alumina while also producing certain The amount of alumina powder. If you do not separate it and used directly for electrolysis, will bring trouble to the electrolysis process. This article describes the use of Al_zO_3 fine powder (≤43μm) to prepare high value refractory and ceramic products such as mullite and special alumina with different content of Na_2O.