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在同时处理霞石和高岭土生产氧化鋁时,为了提高氧化鋁的提取率和减少試剂的用量,事先用含150～170克/升Na_2O的循环碱液在90～95℃下,对高岭土进行处理。
In order to increase the extraction rate of alumina and reduce the amount of reagents when alumina is processed simultaneously with nepheline and kaolin, kaolin is previously treated with a circulating alkali solution containing 150 to 170 g / L of Na 2 O at 90 to 95 ° C .