(昆明理工大学 环境科学与工程学院，昆明 650500)
摘 要: 通过研究不同温度下三氧化二铁(Fe2O3)在铜冶炼污酸中的浸出情况，考察了不同酸度污酸在720 min内的浸出性能和反应过程溶液pH值的变化，探讨了反应过程中的动力学和对污酸中砷的处理效果。结果表明：在整个反应的720 min内，溶液pH并无明显变化，Fe2O3在污酸中的浸出反应过程可以用收缩未反应核模型描述，在10~60 min的反应过程受固相层扩散控制比较明显，浸出反应表观活化能为8.1633 kJ/mol，而60~720 min的反应过程受化学反应过程控制比较明显，浸出反应表观活化能为43.0429 kJ/mol。同时，在65 ℃下Fe2O3对污酸中的砷处理效率可达90%，具有较好的除砷效果。
关键字: 三氧化二铁；铜冶炼污酸；砷；浸出动力学
（Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China）
Abstract:By studying the leaching of ferric oxide in copper-smelting waste acid at different temperatures, the leaching performance of different-acidity waste acids in 720 min and the pH value of the reaction process were investigated, and the kinetics during the reaction and the treatment effect on arsenic in waste acid were discussed. The results show that there is no significant change in the pH of the solution in the whole reaction of 720 min. The leaching reaction of ferric oxide in the copper-smelting waste acid can be described by the unreacted shrinking core model. For the reaction of ferric oxide leaching in the period of 10-60 min, the process is controlled by the diffusion in the solid phase layer, the apparent activation energy is 8.1633 kJ/mol, and the chemical reaction is obviously when the rate-controlling step in the period of 60-720 min, the apparent activation energy is 43.0429 kJ/mol. At the same time, the arsenic treatment efficiency with ferric oxide in the copper-smelting waste acid can reach 90% at 65 ℃, and thus has an effective arsenic removal effect.
Key words: ferric oxide; copper-smelting waste acid; arsenic; leaching kinetics
