高炉铝酸钙炉渣浸出过程动力学

研究了高炉铝酸钙炉渣的浸出动力学，考察了搅拌强度、浸出反应温度、浸出剂初始浓度及炉渣粒度对浸出速率的影响. 结果表明，浸出过程符合一级反应的收缩未反应核模型，宏观动力学方程为1+2(1-xB)-3(1-xB)2/3= 1.108exp(-1906/T)t，表观活化能为15.84 kJ/mol，过程速率为固膜内扩散速率控制. 通过实验数据验证，表明所得模型能较好地描述炉渣的浸出过程.

Leaching Kinetics of Calcium Aluminate Slag

Leaching calcium aluminate slag by Na2CO3 solution is solid?liquid reaction generating solid product. A study on the leaching kinetics of calcium aluminate slag was carried out. The effects of reaction temperature, concentration of reagents, particle size and agitation rate on the leaching rate were deterimined. The results show that the leaching process can be modeled with the shrinking core model of the first order reaction. An empirical equation for the leaching kinetics was established as 1+2(1?xB)?3(1?xB)2/3= 1.108exp(?1906/T)t. The apparent activation energy is 15.84 kJ/mol. The leaching rate is controlled by diffusion of reacting reagents in a porous solid product layer. The leaching mechanism is fairly explained by the model. A higher leaching rate of calcium aluminate slag is obtained by higher leaching temperature and/or with smaller particle size.