某难选金矿石选矿试验

Beneficiation Experiment on a Refractory Gold Ore

某难选金矿石金品位3.21 g/t,嵌布粒度较细,金主要赋存状态为单体金、裂隙金、包裹金,主要载金矿物为石英、黄铁矿、褐铁矿、长石。为回收利用矿石中的金,通过比较单一浮选、重选—浮选、重选—浮选—磁选3种工艺后,采用重选—浮选—磁选流程进行选矿试验。结果表明,在磨矿细度-0.074 mm 72%的条件下,原矿经重选—1粗2精2扫闭路浮选—磁选流程选别,可获得产率6.71%、金品位40.57 g/t、回收率85.12%的混合金精矿,可供确定选矿工艺流程参考。

Gold grade of an intractable gold ore is 3.21 g/t, the disseminated grain size is fine. The main occurrence state of gold is monohthic gold, fissure gold and inclusive gold, the major gold-bearing minerals are quartz, pyrite,limonite and feldspar. In order to recyle the gold in the ore, beneficiation test by gravity separation-flotation-magnetic separation was carried out, after comparing the single flotation, gravity separation-flotation, gravity separation-flotation-magnetic separation. The results show that, at the grinding fineness of - 0. 074 mm 72%, mixed gold concentrate with yield of 6.71%, grade of 40.57 g/t, recovery of 85.12% was obtained, via gravity separation, one flotation, magnetic separation, which could be used for the re et. roughing-two cleaning-two scavenging closed ference to determine the processing flowshe-