难处理金精矿加压氧化预处理

Pressure Oxidation Pretreatment Process of a Refractory Gold Concentrate

研究了某含硫21.2%、含金40.3 g/t难处理金精矿的加压氧化预处理工艺。通过单因素试验研究加压氧化过程中磨矿细度、反应压力、反应温度、反应时间、搅拌转速及矿浆浓度等对氰化效果的影响,得到易于氰化的加压氧化渣。再通过氰化提金过程中矿浆浓度、氰化钠用量、pH、浸出时间等对金浸出率的影响研究,获得最佳加压氧化预处理条件为:磨矿细度-0.045 mm占95%、反应压力1.6 MPa、矿浆浓度20%、反应温度160℃、反应时间240 min、搅拌转速350 r/min。在此条件下,金氰化平均浸出率达到97.3%。

The pressure oxidation pretreatment process of a refractory gold concentrate containing 21.2%sulfur and 40.3 g t gold was studied.The effects of grinding fineness,reaction pressure,reaction temperature,reaction time,stirring speed and pulp concentration on cyanidation were studied by single factor test.A pressure oxidized slag is obtained which is easy to cyanide.Then,the influence of pulp concentration,sodium cyanide dosage,pH value and leaching time on gold leaching rate in the process of cyanidation gold extraction was studied.The results show that the gold average cyanidation leaching rate is 97.3%under the optimum conditions including grinding fineness of-0.045 mm content of 95%,reaction pressure of 1.6 MPa,slurry concentration of 20%,reaction temperature of 160℃,reaction time of 240 min,and stirring speed of 350 r min.