The purpose of this study is to develop the kinetic model and to find the optimum leaching conditions for maximum alumina dissolution from sintered nepheline syenite resource in the alkaline solution. About 80% of alumina (smaller than 5% of silica) was effectively recovered at 80 °C, 3 M NaOH, particle size less than 88 μm, agitation speed of 800 rpm, and leaching time of 60 min with a minimum amount of silica dissolution. Based on the kinetic model and the obtained reaction degree of each effective parameter, the experimental data were simulated. The simulation results proved that the leaching process for alumina was controlled by diffusion through the solid product layer and reaction at the interface of unreacted core that was confirmed by the value of activation energy (15.53 kJ/mol). The provided optimum conditions could be effective to decrease the silica dissolution, and to improve the alumina recovery.

本研究的目的是开发动力学模型，并寻找在碱性溶液中从烧结霞石正长岩资源中最大程度地溶解氧化铝的最佳浸出条件。在 80 °C、3 M NaOH、粒径小于 88 μm、搅拌速度 800 rpm、浸出时间 60 min 的条件下，约 80% 的氧化铝（小于二氧化硅的 5%）被有效回收，且二氧化硅含量最低解散。根据动力学模型和得到的各有效参数的反应程度，对实验数据进行模拟。模拟结果证明氧化铝的浸出过程是通过固体产物层的扩散和未反应核心界面处的反应控制的，活化能值（15.53 kJ/mol）证实了这一点。