Recovery of Gold and Iron from the Cyanide Tailings by Magnetic Roasting

摘要:

对氰化尾渣的焙烧预处理及其对有价金属综合回收的影响进行了研究。结果表明：当焙烧温度为750 ℃、焙烧时间为1.25 h、还原剂添加量为6%时，铁的磁化率为86.27%，金的浸出率达到46.14%。结合矿物构造与赤铁矿磁化焙烧原理，探讨了焙烧对金浸出影响的机理，认为赤铁矿磁化焙烧后解离出的包裹金，是提高金浸出率的主要来源

Abstract:

The pretreatment of the cyanide tailing by roasting and its effect on the followed comprehensive recovery of valuable metals were investigated. The results indicate that the leaching rate of gold reaches 46.14%, the magnetic susceptibility of iron is up to 86.27% when the roasting temperature is 750 °C, the roasting time is 1.25 h, and the dosage of reductant is 6%. Combined with mineral structure and principle of magnetic roasting, the promoting mechanism of gold leaching by roasting was explored. The gold exposed through the magnetic roasting is the foremost improvement for high leaching rate of gold