(湖南大學(xué) 環(huán)境科學(xué)與工程系， 長沙 410012)
摘 要: 探討了從濕法煉鋅廢渣中用硫脲浸出回收銀的浸出反應(yīng)動力學(xué)，從這種難浸的含銀煉鋅廢渣中用硫脲浸出回收銀，浸出反應(yīng)是一種典型的氧化還原反應(yīng)并可充分進行。同時，通過動力學(xué)推導(dǎo)得出，從濕法煉鋅廢渣中用硫脲浸出銀的反應(yīng)動力學(xué)模型為收縮核動力學(xué)模型，同時計算出浸出活化能為13.26kJ/mol。該模型反映了浸出過程中控制整個反應(yīng)速率的決定步驟是固膜擴散速率，并較好地說明了浸出機理。
關(guān)鍵字: 煉鋅廢渣； 浸出動力學(xué)； 收縮核模型； 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
