Abstract: Coal gangue in Panxian, Guizhou Province, was used to extract alumina by leaching with concentrated sulfuric acid. The single factor and orthogonal experiments were conducted to examine the factors influencing the leaching rate of alumina such as the mass ratio of acid to gangue, reaction time and reaction temperature. The optimal conditions and leaching kinetics of this process were also studied. The results show that under the optimal conditions of mass ratio of acid to gangue 1.4(w), reaction time 4 h, and reaction temperature 170℃, the leaching rate of alumina reaches 98.47%. The leaching kinetic study shows that the acid leaching process of alumina form coal gangue can be described with the unreacted shrinking core model of particle unchanged shrinking core model, and the leaching reaction is controlled by interface chemical reaction. The corresponding equation of reaction kinetics can be expressed as 1-(1-x)1/3=kt, and the activation energy of leaching reaction is 61.32 kJ/mol.

Key words: coal gangue, acid leaching, alumina, kinetics

摘要： 以贵州盘县煤矸石为原料，采用单因素实验和正交实验方法，以浓硫酸为酸浸介质酸浸提取煤矸石中氧化铝，考察了酸浸反应主要影响因素，研究了浸出动力学. 结果表明，最佳酸浸提取条件为：酸矸质量比1.4，反应时间4 h，反应温度170℃. 该条件下氧化铝的浸取率达98.47%. 该酸浸反应过程符合收缩未反应核模型的粒径不变缩核模型，反应受界面化学反应控制，反应动力学方程为1-(1-x)1/3=kt，反应活化能为61.32 kJ/mol.

关键词: 煤矸石, 酸浸, 氧化铝, 动力学