高铝粉煤灰烧结反应产物硅铝分离的研究  

Study on Slica-alumina Separated in Reacted Product of Baked High-alumina Fly Ash

作　　者：王蕾[1] 马鸿文[1] 张晓云[1] 李贺香[1] 

机构地区：[1]中国地质大学矿物材料国家专业实验室,北京100083

出　　处：《中国非金属矿工业导刊》2006年第2期29-32,共4页China Non-Metallic Minerals industry

基　　金：矿物材料国家专业实验室开放基金(No:04101)资助

摘　　要：高铝粉煤灰与Na2CO3的烧结反应产物霞石,与HCl反应进行硅铝分离与提纯。通过对影响因素pH值与酸浓度讨论,得出随着pH值的不同,Si以H2SiO42-、H3SiO4-、H4SiO4等形式存在,Al以Al3+、Al(OH)2+、Al(OH)2+和Al(OH)3等形式存在;酸化后的体系pH值在1附近,铝硅酸溶胶体系的胶粒结构被破坏,Si-O-Al键断裂,Al3+溶出,减少了溶胶胶粒的粒径,使溶胶的稳定性降低,Al3+在溶胶中起絮凝剂的作用,使得溶胶胶粒可以沉聚或是絮凝。The reacted product Nepheline baked high-alumina fly ash with Na2CO3, was acid soaked with HCI. The influenced factors pH and acid density is discussed in the paper. Under the different pH, Si is formed H2SiO4^2,H3SiO4^-,H4SiO4 et al; Al is formed Al^3＋,Al（OH）^2＋,Al（OH）^2＋,Al（OH）3 et al. The system pH is close to 1 after acid soaked, and the construction of alu minosilica sol is damaged, the bond of Si-O-Al broken and Al^3＋ dissolved that shorten the sol diameter particle, meanwhile lowered the sol stability. Al^3＋ is performed as aggregation.

关 键 词：粉煤灰 酸浸 铝硅酸溶胶 硅铝分离 

分 类 号：X773[环境科学与工程—环境工程]