甘肃李坝金矿中金的工艺矿物学研究

Study on process mineralogy of gold of the Liba Gold Deposit,Gansu Province

李坝金矿属于与构造蚀变破碎带相关的岩浆期后中低温热液矿床。通过显微镜观察、MLA分析、物相分析等多种手段对4个矿带样品中金的赋存状态进行研究,金矿物以银金矿为主,少量自然金、金银矿,粒度上中粒、细粒、微粒金均有,-2 mm磨矿细度下,中-细粒金大部分解离,微细粒金基本未解离。载金矿物主要是黄铁矿,其次毒砂,金主要在硫化物中呈被包裹状态。选矿上通过浮选得到高As高S金精矿,综合考虑环保及金的提取指标等因素,目前尝试采用生物预氧化方法处理金精矿。

The Liba gold deposit belongs to the post magmatic medium-low temperature hydrothermal deposit,which is related to the tectonic alteration fracture zone.The occurrence state of gold in the four ore belt samples was studied by microscope, MLA analysis, phase analysis and other means..Gold minerals in the deposit are mainly electrum,a small amount of gold and kustelite, and the gold mineral-size distribution medium to particulate.Under -2mm grinding fineness, the majority of medium-fine grained gold mineral is dissociated, andthe fine-grained gold is basically not dissociated. Gold bearing minerals are mainly pyrite,followed by arsenopyrite, which is mainly encapsulated in sulfides..High-S and high-As gold concentrate is obtained by flotation .Considering factors such as environmental protection and the extraction of gold indicator,it is currently attempting to treat gold concentrates by biological pre-oxidation..