(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 以沉金后液為原料，通過SO2直接還原回收硒碲和捕集鉑鈀。采用X射線衍射儀(XRD)和掃描電鏡(SEM)對還原產(chǎn)物的物相、微觀形貌進(jìn)行表征，結(jié)果表明：當(dāng)反應(yīng)溫度為85 ℃，SO2流量為0.2 L/min，反應(yīng)時間為4 h，H+濃度為3.3 mol/L和Cl−濃度為0.72 mol/L時，Se和Te回收率分別為99.5%和96.64%，Pt和Pd回收率均達(dá)到了100%，所得黑色還原產(chǎn)物中硒、碲、鉑和鈀的質(zhì)量分?jǐn)?shù)分別為28.06%、52.3%、0.084%和0.588%。產(chǎn)物中硒和碲均以單質(zhì)態(tài)形式存在，其形貌為球狀體和柱狀體。
關(guān)鍵字: 沉金后液；二氧化硫；還原；硒；碲；鉑；鈀
solution after precipitating gold by SO2 reduction
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Selenium and tellurium were recovered from solution after precipitating gold by SO2 direct reduction. At the same time, platinum and palladium were also captured. The crystalline phase and morphology of reduction product were investigated by X-ray diffractometry (XRD) and scanning electron microscopy (SEM), respectively. The experimental results show that the optimum reaction parameters are proposed as the following: reaction temperature 85 ℃, SO2 flow rate 0.2 L/min, reaction time 4 h, H+ concentration 3.3 mol/L and Cl− concentration 0.72 mol/L. In the optimum parameters mentioned above, 99.5% Se and 96.64% Te are recovered, Pt and Pd recovery rate reach 100%. The mass fractions of selenium, tellurium, platinum and palladium in black reduction product are 28.06%, 52.3%, 0.084% and 0.588%, respectively. The selenium and tellurium exist in the form of simple substance, and their morphologies are spheroid and columnar bodies.
Key words: solution after precipitating gold; sulfur dioxide; reduction; selenium; tellurium; platinum; palladium
