关键词: 金矿　, 工艺矿物学　, 尼尔森重选　, 闭路浮选　, 联合工艺

Abstract: In response to the sharp decline in easily treatable gold resources,the development of efficient separation tech nologies for low-grade,arsenic- and sulfur-bearing complex gold ores is particularly crucial.This study focused on a complex gold ore from Xinjiang.Systematic process mineralogy research was conducted,followed by experimental studies on a combined process involving the Knelson gravity concentration and flotation.The study revealed that the head grade of gold was 2.31 g/t, with locked gold accounting for 63.16%,primarily occurring in arsenopyrite,pyrite and quartz minerals.Optimization of gravity separation parameters yielded the best performance under a grinding fineness of 60% passing 0.074 mm,a centrifugal force of 90 G,and a wash water flow of 5 L/min,producing a gravity concentrate assaying 18.60 g/t Au with a recovery of 56.78%. Subsequent flotation of the gravity tailings,employing one rougher,two cleaners,and three scavenger stages,resulted in a con centrate grade of 17.20 g/t Au with a recovery of 41.61%.This combined gravity flotation approach provides a feasible and ef fective route for the utilization of similar refractory gold resources.

Key words: gold ore,process mineralogy,Knelson gravity separation,closed-circuit flotation,combined process