SO2还原沉金后液回收硒碲及捕集铂钯

摘要

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.%以沉金后液为原料,通过SO2直接还原回收硒碲和捕集铂钯.采用X射线衍射仪(XRD)和扫描电镜(SEM)对还原产物的物相、微观形貌进行表征,结果表明:当反应温度为85℃,SO2流量为0.2 L/min,反应时间为4h,H+浓度为3.3 mol/L和Cl-浓度为0.72 mol/L时,Se和Te回收率分别为99.5％和96.64％,Pt和Pd回收率均达到了100％,所得黑色还原产物中硒、碲、铂和钯的质量分数分别为28.06％、52.3％、0.084％和0.588％.产物中硒和碲均以单质态形式存在,其形貌为球状体和柱状体.