CAJ | 학술논문

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.
이동양겁니침금후액위원료,채용아류산납작위환원제,연구 Cl-최화제화서소복합최화제환원희산원소서화제이급포집침금후액중귀금속금、박、파적공예,병통과XRD화SEM대환원산물분별진행물상분석화현미형모표정.결과표명:당단일Cl-최화제농도위1.1 mol/L、반응온도위85℃、반응시간위2 h、체계류산농도위368 g/L、아류산납용량위100 g/L시,서、금、박、파환원솔위100%,제환원솔위97.7%.채용복합최화제조건하,당nNaCl:nNaBr위1:2시,서화제적환원속솔명현가쾌.환원산물주요성분위제73.95%、동12.35%、서7.65%、금3.31%、파0.95%、박0.24%;환원산물중제주요이단질상태존재,기형모주요위주상체.
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.