机械力作用对低硅型金尾矿粒度及活性的影响

Effects of Mechanical Force on Particle Size and Activity of Low-silicon Gold Tailings

利用机械力作用对低硅型金尾矿进行物理活化,检测了低硅型金尾矿的粒度分布、比表面积,计算了低硅型金尾矿粒度分布的分形维数,并通过胶砂试验和水化放热试验,研究了机械力作用对低硅型金尾矿在碱性环境中活性的影响.结果表明:在试验确定的粉磨制度(磨机转速为320 r/min、大球:中球:小球为2∶5∶3、球料比为3∶1)下,得到最佳粉磨时间为3 h;机械力粉磨能够有效改善低硅型金尾矿粒度分布,提高粒度分布分形维数;低硅型金尾矿粒度分布分形维数与比表面积之间呈良好的线性正相关;与未粉磨的低硅型金尾矿相比,粉磨3 h后,低硅型金尾矿的活性指数以及7 d水化放热累计分别提高了24.7%和35.8%.

The particle size distribution and surface area of low-silicon gold tailings were detected by physical activation of mechanical force,the fractal dimension of low-silicon gold tailings particle size distribution was calculated,and the effect of mechanical force on low-silicon gold tailings activity was studied by strength ratio test and heat of hydration test.The test results showed that the optimum milling time was 3 hours in the milling system set by the experiment(the mill was running at 320 r/min,big balls:medium balls:small balls=2∶5∶3,and the ball-to-powder ratio was 3∶1).The particle size distribution and fractal dimension of low-silicon gold tailings were improved by mechanical force.There was a good linear positive correlation between fractal dimension of particle size distribution and surface area.Compared with the original low-silicon gold tailings,the activity index increased by 24.7%,and 7 d accumulated hydration heat release increased by 35.8%after 3-hour milling.