响应曲面法优化石英脉型金矿尼尔森重选工艺

Optimization of Knelson gravity separation of a quartz vein type gold ore using response surface methodology

使用MD3型尼尔森选矿机对石英脉型金矿进行重选试验研究,利用响应曲面法探究磨矿细度、相对离心力及反冲水压对金回收率的影响,分析各因素之间交互作用的显著性。研究结果表明:磨矿细度对金回收率影响最大,反冲水压次之,相对离心力对金回收率影响最小。相对离心力与反冲水压的交互作用最显著,磨矿细度与反冲水压的交互作用次之,而相对离心力与磨矿细度的交互作用不显著。通过模型预测最优试验条件为:磨矿细度83.17%,相对离心力64.68g(g为重力加速度),反冲水压18.55kPa。在最优条件下,金回收率的预测值为82.48%,验证试验平均值为82.33%,与预测值相近,表明所得预测模型在本研究范围内合理有效。

The present study was carried out for gravity separation of a quartz vein type gold ore with a MD3 Knelson concentrator.The effect of particle size,relative centrifugal force,and fluidizing water pressure on gold recovery was investigated by response surface method,and the significance of interaction between these factors was also analyzed.The results show that the effect of particle size on the gold recovery is the most significant,followed by the effect of fluidizing water pressure,and the effect of relative centrifugal force on the gold recovery is the least significant.The interaction between relative centrifugal force and fluidizing water pressure is the most significant to the gold recovery,with the interaction between fluidizing water pressure and particle size being secondary,while the interaction between relative centrifugal force and particle size is insignificant.The optimal conditions determined by surface contour plots are as follows:particle size,relative centrifugal force and fluidizing water pressure are 83.17%,64.68 g and 18.55 kPa,respectively.Under the optimum conditions the corresponding predicted response values for the gold recovery is 82.48%.The mean value of the measurement is82.33%,which agrees with those predicted value,thus indicating the suitability of the model employed.