某金精矿焙烧氧化—氰化浸金试验研究

Experimental study on the roasting oxidation-cyanidation gold leaching process for a gold concentrate

摘要: 对甘肃某复杂难处理金精矿进行焙烧氧化—氰化浸金试验研究。通过条件优化试验，确定最佳氧化焙烧工艺参数。在金精矿磨矿细度-0.074 mm占79.24 %，一段焙烧温度为550 ℃、充气含氧量为10 %、焙烧时间为1.0 h，二段焙烧温度为650 ℃、充气含氧量为21 %、焙烧时间为1.0 h的条件下，焙砂中砷、碳和硫的脱除率分别为89.22 %、72.05 %和95.51 %，金浸出率为83.76 %。

Abstract: Experimental study was carried out on the roasting oxidation-cyanidation gold leaching process for the treatment of a complex and refractory gold concentrate in Gansu.Through condition optimization test,the optimal parameters for the oxidative roasting are determined.When the gold concentrate has a grinding fineness of -0.074 mm accounting for 79.24 %,the first-stage roasting is conducted at a temperature of 550 °C,with an oxygen content of 10 % in aeration and a roasting time of 1.0 h.The second-stage roasting is conducted at a temperature of 650 °C,with an oxygen content of 21 % in aeration and a roasting time of 1.0 h.Under these conditions,the arsenic,carbon,and sulfur removal rates in the roasted slag 89.22 %,72.05 %,and 95.51 %,respectively,and the gold leaching rate is 83.76 %.