内蒙古某金矿磨矿分级产物离心重选实验研究

Experimental Study on the Centrifugal Separation of Grinding Classification Products for a Gold Mine in Inner Mongolia

针对内蒙古某金矿磨矿分级回路存在粗粒自由金的循环积聚,本文研究采用离心重选从磨矿分级产物中回收粗粒金。结果表明,离心重选对一段沉砂的分选效果较好,利用回归分析,建立一段沉砂离心重选中影响因素与选别指标的二元二次回归方程,并绘制响应曲面,确定较佳分选条件,即离心力场60 G左右、高反冲水压力>70 kPa。在较佳条件下,重选精矿金品位随批次给矿量增加而线性增大,当一次实验给矿量增加到15 kg时,精矿品位可达760 g/t。研究成果为现场技术改造提供了重要参考依据。

Aimed at the existence of accumulated coarse free gold particles in the grinding classification circuit at an Inner Mongolia gold mine,the recovery of coarse free gold from grinding classification circuit products using centrifugal separation was carried out in this paper.The results showed that the centrifugal separation efficiency for the underflow of first stage hydrocyclone was high.The quadratic equation between centrifugal separation index and influence factors was built and the response surface was drawn using regression analysis,which showed that the optimal separation conditions were centrifugal force field at 30-60 G and recoil pressure bigger than 70 kPa.Under the optimal conditions,the gold grade of concentrate increased linearly with the increase of feeding amount for each batch test.The concentrate gold grade reached 760 g/t at 15 kg of feeding amount.The results provided important evidence for the industrial technical renovation.