高铁三水铝土矿综合利用新工艺

通过对铝土矿进行X射线衍射分析和电镜分析，确定了原料的主要物相和形貌.采用低温硫酸焙烧法可以将铝、铁与硅进行有效的分离.实验考察不同条件对铝、铁提取率的影响，结果表明:焙烧温度在350℃，恒温时间60min，硫酸加入量为理论所需量的12倍时，铝、铁的提取率均可达到92%以上.采用黄钠铁矾法使焙烧熟料水溶出后所得滤液中的大部分铁沉淀，铁的沉淀率达90%以上，铝的沉淀率可控制在5%以内.

Novel Process for Comprehensive Utilization of High Iron Bauxite

The bauxite was characterized by X ray diffraction (XRD) and scanning electron microscopy (SEM)， and the main phase and morphology of the raw material were determined. Aluminum， iron and silicon can be effectively separated by low temperature sulfuric acid roasting process. The effects of process parameters on the extraction rates of aluminum and iron were investigated experimentally. When the amount of sulfuric acid is 12 times as the amount of theory， the extraction rates of aluminum and iron are above 92% at 350℃ for 60min. Most of the iron in the filtrate was deposited by natrojarosite method， and the iron precipitation rate could reach more than 90%， with the aluminum deposition rate controlled within 5%.