某贫硫化物难处理金矿石工艺矿物学研究

Study on the process mineralogy of a low-sulfide refractory gold ore

利用电子显微镜、自动矿物解离分析仪(MLA)及电子探针等检测手段,对某贫硫化物难处理金矿石进行了工艺矿物学研究。研究结果表明:该矿石金品位为2.89 g/t,金为唯一有价元素,含硫0.14%,矿石氧化率高于75%,属于贫硫化物含金氧化矿石类型。在磨矿细度为-0.074 mm占90%的矿石中受劫金物质影响金占48.10%,脉石矿物包裹金占6.92%,单体金及连生金占44.98%。微细粒包裹、粒度过粗、易受劫金物质影响是影响金矿物回收的主要矿物学因素。

The process mineralogy of a low-sulfide refractory gold ore was studied using testing techniques such as scanning electron microscopy,MLA,and electron probe.The research results indicate that the gold grade of the ore is 2.89 g/t,with gold being the only valuable element present,sulfur content of 0.14%,and ore oxidation rate exceeding 75%.The ore belongs to the low-sulfide refractory gold ore type.In the run-of-mill ore product with a particle grinding fineness of-0.074 mm accounting for 90%,gold affected by preg-robbing matters accounts for 48.10%,gold encased in gangue minerals accounts for 6.92%,and gold occurring as monomer and associated gold accounts for 44.98%.Fine-grained inclusions,excessively coarse particle size,and susceptibility to the influence of preg-robbing matters are the main mineralogical factors affecting gold recovery.