赤泥主要物相的表面性质对其沉降性能的影响  

Effect of surface property of main minerals in red mud on their sedimentation ability

作　　者：李小斌[1,2] 赵东峰[1] 章宣[1] 刘桂华[1,2] 彭志宏[1,2] 周秋生[1,2] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]中南大学难冶有色金属资源高效利用国家工程实验室,长沙410083

出　　处：《中国有色金属学报》2012年第1期281-286,共6页The Chinese Journal of Nonferrous Metals

摘　　要：测定甘油、苯及二碘甲烷与氧化铝生产中赤泥主要物相之间的接触角,采用Owens二液法估算各物相的表面自由能,分析了赤泥主要物相的表面性质与其沉降性能之间的关系,并讨论针铁矿在高压处理后沉降性能变差的原因。结果表明:甘油-苯和甘油-二碘甲烷测定数据估算的溶剂化趋势按水化石榴石、硅酸二钙、水合铝硅酸钠、钛酸钙、针铁矿、赤铁矿、石灰石的顺序递减,而其沉降性能与之相反,即溶剂化趋势越小,沉降性能越好。赤泥主要物相中,针铁矿高压处理后转变为赤铁矿,固相粒径变小,溶剂化趋势增加,从而导致其沉降性能恶化。The contact angles of glycerol,benzene and diiodomethane on the main minerals in red mud from alumina production were measured,and the corresponding surface free energy values were estimated by Owens two liquids method.And then,the relationship between the sedimentation ability of the minerals and their surfacial properties was discussed.Further,the reason for the sedimentation ability of goethite getting worse after high-pressure treatment was also discussed.The results show that the solvent tendency reduces in the following order： hydration garnet,dicalcium silicate,sodium alumino-silicate hydrate（DSP）,calcium titanate,goethite,hematite and limestone,while the sedimentation ability tendency is reverse.Less solvent tendency improves their sedimentation.In addition,the sedimentation ability of fresh hematite deteriorates due to the thinning in grain size and the decrease in solvent tendency when goethite changes into hematite in aluminate solution at high pressure.

关 键 词：赤泥 表面自由能 Owens二液法 沉降性能 针铁矿 

分 类 号：TF09[冶金工程—冶金物理化学] O647.11[理学—物理化学]