(湖南大学 环境科学与工程系， 长沙 410012)
摘 要: 探讨了从湿法炼锌废渣中用硫脲浸出回收银的浸出反应动力学，从这种难浸的含银炼锌废渣中用硫脲浸出回收银，浸出反应是一种典型的氧化还原反应并可充分进行。同时，通过动力学推导得出，从湿法炼锌废渣中用硫脲浸出银的反应动力学模型为收缩核动力学模型，同时计算出浸出活化能为13.26kJ/mol。该模型反映了浸出过程中控制整个反应速率的决定步骤是固膜扩散速率，并较好地说明了浸出机理。
关键字: 炼锌废渣； 浸出动力学； 收缩核模型； 活化能
thiourea from residue in hydrometallurgy of zinc
（Department of Environmental Engineering，
Hunan University， Changsha 410012，P.R.China）
Abstract:The leaching kinetics of silver extracted by thiourea solution from a leached residue in the hydrometallurgy of zinc was studied. The leaching reaction is a typical oxido-reduction reaction, and the leaching kinetics can be expressed by the shrinking core model. The leaching mechanism is fairly explained by the model, and the model is consistent with the experimental results. The activation energy is calculated according to the Arrhenius equation and activation energy is 13.26kJ/mol.
Key words: leached residue； leaching kinetics； shrinking core model； activation energy
