某含砷难处理金精矿焙砂氰化尾渣氯化挥发回收金、银试验研究

Experimental research on gold and silver recovery with the chlorination volatilization of the tailings from roasting slags cyanidation of a refractory arsenic-bearing gold concentrate

某含砷难处理金精矿焙砂氰化尾渣中的有价元素为金、银,试验采用氯化挥发法进行回收。研究了氯化钙用量、焙烧温度、焙烧时间对金、银等氯化挥发率的影响。结果表明:随着氯化钙用量的增加,氰化尾渣中各金属元素的挥发率呈先增大后稳定或略有降低的变化趋势,且不同金属元素实现最大挥发率所需的氯化钙用量不同;在氯化钙用量7%、焙烧温度1050℃、焙烧时间30 min时,各金属元素完成氯化挥发过程;当焙烧时间75 min时,可实现氯化剂分解率99.0%以上。

The valuable elements are gold and silver in the tailings from roasting slags cyanidation of a refractory arsenic-bearing gold concentrate.The experiment recovers them with chlorination volatilization method.The study looked into the effect of the calcium chloride dosage,roasting temperature and roasting time on the volatilization rate of gold and silver.The results show that with increasing calcium chloride dosage,the volatilization rate of each metal element increases first before stabilizes or slightly decreases,and for different metal elements,the calcium chloride dosage needed to reach maximum volatilization rate is different;when the calcium chloride dosage is 7%,the roasting temperature is 1050℃,the roasting time is 30 min,each metal element can complete the chlorination volatilization process;the decomposition rate of chlorinating agent is over 99.0%when the roasting time is over 75 min.