豫西某金钨矿的工艺矿物学研究

为综合回收利用金、钨资源，为选矿工艺的优化提供依据，采用MLA矿物自动检测技术、化学分析、X衍射分析等手段，对豫西某金钨矿开展了工艺矿物学研究。结果表明：矿石中可回收利用的元素为Au和W，其品位分别为Au 2.15 g/t，WO3 0.12%；金主要以自然金、碲金银矿等独立矿物形式存在，与金属硫化物紧密共生，多以微细粒包裹金形式赋存于黄铁矿；在磨矿细度-0.074 mm含量占65%时，仍包裹于黄铁矿和磁黄铁矿中的金占82.86%，单体解离度仅为13.56%，单矿物分析显示黄铁矿中金含量为22.3 g/t，而磁黄铁矿中金含量仅为3.09 g/t。含钨矿物主要为白钨矿，少量黑钨矿，白钨矿物粒度较细，主要集中在0.1~0.01 mm。因此，建议采用浮选工艺富集硫化物得到金精矿，然后可通过磁选除去磁黄铁矿达到进一步富集金的目的，再对选金尾矿进行白钨浮选回收。

Process Mineralogy study on a Gold Ore in Western Henan Province

In order to comprehensively utilize the gold and tungsten resources and provide a basis for the optimization of mineral dressing process, process mineralogy study is carried out on a quartz vein type gold-tungsten ore from Henan province using MLA analysis, traditional chemical analysis, X-ray analysis and other methods. The results show that the grades of valuable elements Au and W are 2.15 g/t and 0.12% in WO₃. Au element mainly exists in the form of independent minerals such as natural gold, bismuth gold and silver ore, and closely coexists with metal sulfides, which is mainly in the form of fine-grained and wrapped gold in pyrite. When the grinding fineness (-0.074 mm size fraction) is 65%, only 13.56% gold is released, and 82.86% gold is still wrapped in pyrite. Meanwhile, the chemical analysis shows that the gold contents in pyrite and pyrrhotite are 22.3 g/t and 3.09 g/t, respectively. The tungsten minerals exist mainly in scheelite with fine grain size of 0.1~0.01 mm and a small amount of wolframite. Therefore, gold can be further benefited by magnetic separation of pyrrhotite from the gold flotation concentrate and scheelite was recovered by flotation from the gold tailings.