(昆明理工大學 環(huán)境科學與工程學院，昆明 650500)
摘 要: 通過研究不同溫度下三氧化二鐵(Fe2O3)在銅冶煉污酸中的浸出情況，考察了不同酸度污酸在720 min內(nèi)的浸出性能和反應過程溶液pH值的變化，探討了反應過程中的動力學和對污酸中砷的處理效果。結(jié)果表明：在整個反應的720 min內(nèi)，溶液pH并無明顯變化，F(xiàn)e2O3在污酸中的浸出反應過程可以用收縮未反應核模型描述，在10~60 min的反應過程受固相層擴散控制比較明顯，浸出反應表觀活化能為8.1633 kJ/mol，而60~720 min的反應過程受化學反應過程控制比較明顯，浸出反應表觀活化能為43.0429 kJ/mol。同時，在65 ℃下Fe2O3對污酸中的砷處理效率可達90%，具有較好的除砷效果。
關鍵字: 三氧化二鐵；銅冶煉污酸；砷；浸出動力學
（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
