卡林型金矿的高效分选回收

Efficient separation and recovery technology of a refractory Carlin-type gold ore

卡林型金矿浮选是选矿的难点之一,也是研究热点之一。某金矿属卡林型金矿,矿石性质复杂,金呈微细浸染嵌布,碳酸盐矿物、黏土矿物和碳质矿物含量高,载金矿物可浮性差,金的回收难度极大。从脉石矿泥含量大难以抑制、金呈微细浸染嵌布、载金矿物可浮性差异大等严重影响浮选指标的关键技术性难题出发,采用深度分散抑制—活化增效—分速浮选技术,并利用捕收剂的协同效应,有效降低了中矿循环负荷,实现了金矿物的高效分选回收。浮选闭路试验可获得金品位24.61 g·^(-1)、金回收率80.42%的金精矿。采用该工艺技术后无需预先脱除矿泥,解决了以往金精矿金品位和金回收率低的双难题,减化了作业流程,为解决呆滞的金矿资源回收提供了技术支持。

Carlin-type gold ore flotation is one of the difficulties in beneficiation and also one of the research hotspots.A certain gold deposit is of Carlin-type with complex ore properties and is disseminated in subsieve particles with high content of carbonate minerals,clay minerals and carbonaceous minerals.The gold-bearing minerals have poor floatability,making the recovery of gold extremely difficult.Starting from the key technical challenges that seriously affect flotation indicators,such as high content of gangue slime that is difficult to suppress,subsieve disseminated gold,and large differences in floatability of gold-bearing minerals,this study adopts deep dispersion depression-activation synergism-flotation at a different velocity and utilizes the synergistic effect of the collector to effectively reduce the circulating load of middling ore and realize efficient separation and recovery of gold minerals.A gold concentrate with a gold grade of 24.61 g·t^(-1) and a gold recovery rate of 80.42%could be obtained by the flotation closed-circuit test.After adopting this technology,there is no need to remove the slime beforehand,which solves both the problems of low gold grade and recovery in the past,reduces the operation process,and provides technical support for solving the recovery of sluggish gold resources.