(中南大學 冶金科學與工程學院，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)對還原產物的物相、微觀形貌進行表征，結果表明：當反應溫度為85 ℃，SO2流量為0.2 L/min，反應時間為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回收率均達到了100%，所得黑色還原產物中硒、碲、鉑和鈀的質量分數分別為28.06%、52.3%、0.084%和0.588%。產物中硒和碲均以單質態(tài)形式存在，其形貌為球狀體和柱狀體。
關鍵字: 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
