(1. 中南大学 冶金与环境学院，长沙 410083；
2. 河南中原黄金冶炼厂有限责任公司 河南省黄金资源综合利用重点实验室，三门峡 472000)
摘 要: 以铜阳极泥沉金后液为原料，采用亚硫酸钠作为还原剂，研究Cl-催化剂和卤素复合催化剂还原稀散元素硒和碲以及捕集沉金后液中贵金属金、铂、钯的工艺，并通过XRD和SEM对还原产物分别进行物相分析和显微形貌表征。结果表明：当单一Cl-催化剂浓度为1.1 mol/L、反应温度为85 ℃、反应时间为2 h、体系硫酸浓度为368 g/L、亚硫酸钠用量为100 g/L时，硒、金、铂、钯还原率为100%，碲还原率为97.7%。采用复合催化剂条件下，当nNaCl:nNaBr为1:2时，硒和碲的还原速率明显加快。还原产物主要成分为碲73.95%、铜12.35%、硒7.65%、金3.31%、钯0.95%、铂0.24%；还原产物中碲主要以单质状态存在，其形貌主要为柱状体。
关键字: 亚硫酸钠；还原；催化；稀散金属；贵金属
（1. School of Metallurgy and Environmental, Central South University, Changsha 410083 China;
2. Henan Province Key Laboratory of Gold Resource Utilization, Henan Zhongyuan Gold Smelter Co., Ltd.,
Sanmenxia 472000, China）
Abstract:By using sodium sulfite as reductant and Cl- and composited halogen ions as catalysts, selenium and tellurium were recovered and gold, platinum and palladium were captured from precipitated gold solution that was leached by chlorination and reduction from copper anode slime. The crystalline phase and the morphology of reduction product were investigated by XRD and SEM, respectively. The results show that the reduction rates of selenium, gold, platinum and palladium are 100.0% and the reduction rate of tellurium is 97.7% when Cl- concentration is 1.1 mol/L，reaction temperature is 85 ℃，reaction time is 1 h, H2SO4 concentration is 368 g/L and Na2SO3 concentration is 100 g/L. The reaction speed is faster than that of NaCl catalyst when the molar ratio of NaCl to NaBr in the complex catalysts is 1:2. The mass fractions of tellurium, copper, selenium, gold, palladium, platinum in reduction product are 73.95%, 12.35%, 7.65%, 3.31%, 0.95%, 0.24%, respectively. Tellurium exists in the form of simple substance in the reduction product, the morphology of the product is columnar body.
Key words: sodium sulfite; reduction; catalyst; rare metal; noble metal
