The alumina calcium hydrate was abtained by procipitation of Al 2O 3 in the Bayer liquor with Ca(OH) 2. The precipitate was then separated and the circulation efficiency was improved for the Bayer process.

• 用石灰乳沉淀工业拜尔法种分母液中的Al2 O3 ,得到水合铝酸钙等 ,将其分离并加以利用 ,可以提高拜尔法的循环效率。