提升贵州水银洞金矿浮选工艺指标生产实践

贵州水银洞金矿石为微细粒浸染型难选金矿石，矿石中载金矿物黄铁矿、毒砂等粒度微细、且含大量易泥化脉石矿物。选矿厂采用细磨浮选工艺，细度需达到-74 μm占90%左右载金矿物才能充分解离，磨矿过程容易产生“过磨”。通过对浮选厂磨矿、粗选、精选等作业取样、浓度和细度检查、筛析、化验分析等手段开展详细的全流程工艺流程考察，发现存在“泥化”、浮选药剂复杂、精选浓度低、尾矿中金在粗细粒级回收效果差等问题。针对上述问题，在实验室选矿药剂制度优化试验研究的基础上，通过调整磨机球配减少“过磨”，通过调整作业浓度、优化药剂制度、减少精选次数等措施，提高精矿产率，减少中矿的循环，强化了粗、精选作业效率，降低了尾矿品位，使浮选指标提高，金回收率比工艺优化前提高5.76%，达到91%以上。 

Production Practice to Improve the Flotation Process Index of Shuiyindong Gold Mine in Guizhou Province

The gold ore of Shuiyindong Gold Mine in Guizhou province is a micro-fine disseminated refractory gold ore, which contains gold-bearing minerals such as pyrite and arsenopyrite with fine particle size and a large number of gangue minerals that are easy to be argillated. For the process of floating these raw materials, fineness should be α -74 μm 90%. The gold bearing minerals can be fully dissociated, but in the grinding process it is easy to"over-grind". The whole process of rough and cleaning operations in flotation plant were explored in details through sampling, concentration, fineness inspection, screening analysis and laboratory analysis. It was found that there were problems such as "slime", complex flotation reagents, low concentration of cleaning flotation and poor recovery effect of gold in tailings at coarse and fine particle fraction. For those problems, on the basis of experimental study of the reagents optimization system in laboratory, through methods such as adjusting the ball mill with reduce " over-grinding ",adjusting the concentration of pulp in processing, optimizing the reagents system and reducing the number of cleaning flotation we started to have better results. After all that we managed to increase the rate of fine mineral, reduce the cycle of middlings, strengthen the rough and cleaning flotaion of operation efficiency, reduce the tailings grade and raise the index of flotation. Finally, the recovery of gold is increased from 5.76% to over 91%.