山东某低品位金矿工艺矿物学

Detailed Study on Technological Mineralogy of a Low Grade Gold Ore in Shandong

山东某地金矿平均含Au 0.8~1.0 g/t,属低品位金矿。由于矿石含金较低,为降低选矿成本,有效回收有价金属,对矿石进行详细的工艺矿物学研究。研究发现,该矿石自然类型为石英黄铁矿脉,工业类型为中硫金矿石。矿石中金属矿物主要为硫化物,以黄铁矿为主,次为方铅矿、闪锌矿,含少量黄铜矿等,非金属矿物主要为石英、绢云母等。矿石中黄铁矿粒度较粗,方铅矿、闪锌矿、黄铜矿等粒度较细,黄铁矿、方铅矿等与金关系较密切,是金的主要载体矿物。自然金主要为细粒金,多呈包裹体分布。根据工艺矿物学研究结果,建议采用“重选+浮选”工艺流程,不但取得较高的精矿指标,且降低了选矿成本。

The gold mine in a certain place in Shandong contains 0.8~1.0 g/t Au on average,which is a low-grade gold mine.Because the ore contains low gold,in order to reduce the cost of beneficiation and effectively recover valuable metals,detailed process mineralogical research is carried out on the ore.The study found that the natural type of the ore is quartz pyrite veins,and the industrial type is medium-sulfur gold ore.The metal minerals in the ore are mainly sulfides,mainly pyrite,followed by galena,sphalerite,and a small amount of chalcopyrite.Non-metallic minerals are mainly quartz,sericite,etc.In the ore,the particle size of pyrite is relatively coarse,and the particle size of galena,sphalerite,chalcopyrite,etc.is relatively fine.Pyrite and galena are closely related to gold and are the main carrier minerals for gold.Natural gold is mainly fine-grained gold,mostly distributed in inclusions.According to the research results of process mineralogy,it is recommended to adopt the"gravity separation+flotation"process,which not only achieves higher concentrate indicators,but also reduces the cost of mineral processing.