(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083；
2. 中南大學(xué) 難冶有色金屬資源高效利用國家工程實(shí)驗(yàn)室，長沙 410083)
摘 要: 測定甘油、苯及二碘甲烷與氧化鋁生產(chǎn)中赤泥主要物相之間的接觸角，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質(zhì)與其沉降性能之間的關(guān)系，并討論針鐵礦在高壓處理后沉降性能變差的原因。結(jié)果表明：甘油−苯和甘油−二碘甲烷測定數(shù)據(jù)估算的溶劑化趨勢按水化石榴石、硅酸二鈣、水合鋁 硅酸鈉、鈦酸鈣、針鐵礦、赤鐵礦、石灰石的順序遞減，而其沉降性能與之相反，即溶劑化趨勢越小，沉降性能越好。赤泥主要物相中，針鐵礦高壓處理后轉(zhuǎn)變?yōu)槌噼F礦，固相粒徑變小，溶劑化趨勢增加，從而導(dǎo)致其沉降性能惡化。
關(guān)鍵字: 赤泥；表面自由能；Owens二液法；沉降性能；針鐵礦
main minerals in red mud on their sedimentation ability
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. National Engineering Laboratory for Efficient Utilization of Refractory Non-ferrous Metals Resources,
Central South University, Changsha 410083, China）
Abstract: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.
Key words: red mud; surface free energy; Owens two liquids method; sedimentation ability; goethite
