氰化尾渣氯化挥发-还原焙烧一步法回收金铁

Recovering Gold and Iron from Cyanide Tailing by One-step Process of Chloridizing Volatilization and Reduction Roasting

为探索氯化挥发-还原焙烧一步法回收氰化尾渣中金、铁的可行性,以河南某黄金冶炼企业金品位为4.57 g/t、铁品位为42.95%的氰化尾渣为研究对象,氯化钙和氯化钠为氯化剂(按w(Ca Cl2)∶w(Na Cl)=4∶1混合添加),烟煤为还原剂,进行了氯化挥发-还原焙烧试验。结果表明:在氯化剂用量为10%、烟煤用量为18%、焙烧温度为1 000℃、焙烧时间为80 min、焙烧产品磨矿细度为-0.043 mm占75%、磁场强度为106 k A/m时,可以获得金挥发率为85.19%、精矿铁品位为74.16%、回收率为87.75%的指标。试验结果为从氰化尾渣中回收金、铁提供了一种新途径。

Chlorinated volatile-reduction roasting experiment was conducted in order to find the feasibility of one-step recovery gold and iron from cyanide tailing,using cyanide tailing（ assaying 4. 57 g / t gold,and 42. 95% iron） from a gold smelting enterprises in Henan Province as research object,calcium chloride and sodium chloride as chlorination agents（ w（ Ca Cl2） ∶ w（ Na Cl） = 4∶ 1 mixture）,bituminous coal as reductant. Results show that on the dosage of chlorination agent is 10%,dosage of bituminous coal is 10%,calcination temperature is 1 000 ℃,the roasting time is 80 min,grinding fineness of calcined products is 75%-0. 043 mm,magnetic field intensity is 106 k A / m,gold volatilize rate of 85. 19%,iron concentrate with iron grade and recovery of 74. 16% and 87. 75% is obtained. Test results provide a new way for the recovery of gold and iron from cyanide tailing.