(昆明理工大學(xué) 冶金與能源工程學(xué)院，昆明 650093)
摘 要: 以鋅浸渣還原浸出液作為研究對(duì)象，研究鐵粉與還原浸出液中Cu(Ⅱ)、As(Ⅲ)的反應(yīng)行為。熱力學(xué)計(jì)算表明，在鋅浸渣還原浸出液中，加入鐵粉使溶液中Cu(Ⅱ)、As(Ⅲ)轉(zhuǎn)化為Cu2O和Cu3As沉淀是可行的。實(shí)驗(yàn)結(jié)果表明：最佳反應(yīng)條件為鐵粉加入系數(shù)1.2、反應(yīng)時(shí)間25 min、反應(yīng)溫度70 ℃，在此條件下，還原浸出液中銅、砷的沉淀率能達(dá)到99%以上；通過(guò)對(duì)沉銅渣進(jìn)行XRD分析表明，沉銅渣中主要成分為Cu2O和Cu3As；SEM-EDS檢測(cè)顯示，反應(yīng)產(chǎn)物Cu2O和Cu3As在鐵粉表面呈點(diǎn)狀、散亂分布，沒(méi)有對(duì)鐵粉表面形成致密包裹，使反應(yīng)充分進(jìn)行。此外，增大鐵粉加入系數(shù)、提高反應(yīng)溫度都能促進(jìn)Cu2O和Cu3As的形成。
關(guān)鍵字: 還原浸出液；鐵粉；反應(yīng)行為；熱力學(xué)
（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
