针对我国高品位铝土矿资源紧缺的现状,提出了钙化—碳化法利用中低品位铝土矿新工艺.考查了钙化温度、氧化钙添加量以及碳化温度、CO2压力和反应时间对氧化铝提取率、赤泥中碱含量的影响.实验得到的适宜的钙化条件为:温度180℃,50％的氧化钙添加量,碳化条件为:温度100℃,CO2压力1.0 MPa,反应时间2～3h.在适宜条件下,氧化铝的提取率为75.4％,赤泥中w(Na2O)为0.67％;经过二次碳化以后,氧化铝提取率达到81.2％,赤泥中w(Na2O)降至0.57％.
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