公开(公告)号：US4477427A

公开(公告)日：1984-10-16

申请号：US440260

申请日：1982-11-09

申请人： Jozsef Matyasi ,  Gyorgy Kaptay ,  Laszlo Zsembery ,  Bela Kokeny ,  Jozsef T. Toth ,  Maria Toth Nee Homostrei ,  Imre Penzes

发明人： Jozsef Matyasi ,  Gyorgy Kaptay ,  Laszlo Zsembery ,  Bela Kokeny ,  Jozsef T. Toth ,  Maria Toth Nee Homostrei ,  Imre Penzes

IPC分类号： C01F7/44 ,  C04B35/111 ,  C01F7/30 ,  C01F7/02

CPC分类号： C04B35/111 ,  C01F7/442

摘要： Process for the preparation of alkali-poor .alpha.-alumina for ceramic purposes. Technical grade aluminum hydroxide is activated and calcinated in the presence of a mineralizing mixture comprising halides and boron compounds. The process further comprises activating aluminum hydroxide at a temperature of 500-600 degrees C., washing the activated product with alkali-free water containing calcium ions and having a conductivity not exceeding 70 .mu.S/cm until the alkali content expressed in Na.sub.2 O becomes lower than 0.15% by weight, adding 0.4-0.7% by weight of a mineralizing mixture to the washed product, and calcinating the same at a temperature of 1200-1350 degrees C.

摘要翻译： 用于制备用于陶瓷目的的贫碱α-氧化铝的方法。 在含卤化物和硼化合物的矿化混合物存在下，将工业级氢氧化铝活化并煅烧。 该方法还包括在500-600℃的温度下活化氢氧化铝，用含有钙离子的不含碱的水洗涤活性产物，导电率不超过70μS/ cm，直到Na 2 O表达的碱含量变低 0.15重量％以上，向洗涤后的制品中添加0.4〜0.7重量％的矿化混合物，并在1200-1350℃的温度下煅烧。