含反应氧化硅(SiO_2超过5％)量高的三水铝石不能用拜耳法进行经济地处理,因为,随残渣(赤泥)会有大量的固定碱损失掉。目前,对这类铝土矿采用联合拜耳法和拜耳法残渣的石灰-碱烧结法来回收作为脱硅产品 Gibbsite containing high amounts of reactive silica (over 5% SiO 2) can not be economically treated by the Bayer process since there is a substantial amount of fixed base lost with the residue (red mud). At present, this type of bauxite is recovered as a desiliconized product by a combined lime-alkali sintering method of Bayer process and Bayer process