摘要
研究添加铁酸钙条件下铝硅比(A/S)为5.96的铝土矿的溶出规律对溶出赤泥进行X射线衍射、扫描电镜和能谱分析。结果表明:随铁酸钙添加量增多,溶出赤泥铝硅比和钠硅比均下降;随配矿量减少,溶出温度升高,溶出时间延长,溶出赤泥铝硅比降低;在温度为250℃,时间为60min,使用铁酸钙添加剂,得到的赤泥铝硅比为0.69,钠硅比(N/S)为0.21;赤泥中硅矿物以铁取代铝的水化石榴石为主,Fe2O3的饱和系数为0.73,Al2O3的饱和系数为0.22,SiO2饱和系数接近1,硅矿物组成改变是赤泥铝硅比和钠硅比降低的原因。
The digesting rule of diasporic bauxite with A/S of 5.96 was studied by adding calcium ferrite. With increasing addition of calcium ferrite, A/S and N/S in the red mud are reduced. Under the conditions of higher digestion temperature and longer time, A/S in the red mud is reduced with lower bauxite addition. Under the condition of 250 ℃, 60 min and adding calcium ferrite, large scale experiments have been done, which results in that A/S in the red mud is 0.69, N/S is 0.2 1. The main Si-mineral of red mud is ferrite hydro-garnet through analysis of X-ray diffraction and SEM. The coefficient of SiO2 approaches 1, Al2O3 is 0.22, Fe2O3 is 0.73 in ferrite hydro-garnet. It is because the structure of Si-mineral is changed that A/S and N/S in the red mud is greatly reduced.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第E01期101-105,共5页
The Chinese Journal of Nonferrous Metals
关键词
铝土矿
铁酸钙
拜耳法
溶出
bauxite
calcium ferrite
Bayer process
digestion