(昆明理工大学 冶金与能源工程学院，昆明 650093)
摘 要: 以锌浸渣还原浸出液作为研究对象，研究铁粉与还原浸出液中Cu(Ⅱ)、As(Ⅲ)的反应行为。热力学计算表明，在锌浸渣还原浸出液中，加入铁粉使溶液中Cu(Ⅱ)、As(Ⅲ)转化为Cu2O和Cu3As沉淀是可行的。实验结果表明：最佳反应条件为铁粉加入系数1.2、反应时间25 min、反应温度70 ℃，在此条件下，还原浸出液中铜、砷的沉淀率能达到99%以上；通过对沉铜渣进行XRD分析表明，沉铜渣中主要成分为Cu2O和Cu3As；SEM-EDS检测显示，反应产物Cu2O和Cu3As在铁粉表面呈点状、散乱分布，没有对铁粉表面形成致密包裹，使反应充分进行。此外，增大铁粉加入系数、提高反应温度都能促进Cu2O和Cu3As的形成。
关键字: 还原浸出液；铁粉；反应行为；热力学
（Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:Taking a reductive leaching solution as the research object, the reactive behaviors between Fe, Cu(Ⅱ) and As(Ⅲ) in the reductive leaching solution were investigated thermodynamically and experimentally. The thermodynamic calculation results show that the reactions between Fe, Cu(Ⅱ) and As(Ⅲ) in the reductive leaching solution, which produce both Cu2Oand Cu3As, respectively, are feasible thermodynamically. And the experimental results show that the optimal reaction condition as follows: iron powder coefficient of 1.2, reaction time of 25 min and reaction temperature of 70 ℃. Under the optimum conditions, the Cu and As precipitation rates reach more than 99%. The main compositions of the residue are Cu2O and Cu3As, and the precipitates deposit in punctate form, and do not closely coat the surface of iron powders, according to XRD and SEM-EDS analyses. Furthermore, increasing the coefficient of iron powders and temperature can improve the Cu2O and Cu3As deposition.
Key words: reductive leaching solutions; metallic iron; reactive behaviors; thermodynamically
