河南嵩县下蒿坪金矿工艺矿物学研究

Study on process mineralogy of Xiahaoping gold mine in Song County,Henan Province

通过化学分析、扫描电镜以及工艺矿物学自动定量分析系统(MLA)等测试方法对河南嵩县下蒿坪金矿进行了系统的工艺矿物学研究,包括原矿化学组成、矿物组成、金的赋存状态、主要载金矿物嵌布特征以及矿物解离特性等。结果表明,该金矿中主要可回收的有价金属为金,其品位为3.75×10-6。该金矿的原矿矿物主要由石英、钾长石、钠长石、黄铁矿和铁白云石组成,此外还有少量的赤铁矿、萤石、白云石以及方解石。原矿中的金主要赋存在黄铁矿中,而黄铁矿大部分以细粒、微细粒形式嵌布在石英和长石颗粒中。原矿中自然金的含量非常少,多以单独的自然金颗粒形式存在。原矿磨至P80=0.074 mm(-0.074 mm粒级含量占80%)时载金矿物黄铁矿、方铅矿、闪锌矿的单体解离度相对较高,有利于通过浮选回收。

The systematic process mineralogy study of Xiahaoping gold mine in Song County,Henan Province,was carried out by means of chemical analysis,scanning electron microscope and automatic quantitative analysis(MLA),including chemical composition of raw ore,mineral composition,occurrence state of gold,dissemination characteristics of main gold-bearing mineral,and mineral liberation characteristics.The results indicate that the main valuable metal in the mine is gold,with a grade of 3.75×10~(-6).The gold deposit is mainly composed of quartz,K-feldspar,albite,pyrite and ankerite,and a small amount of hematite,fluorite,dolomite and calcite.The gold in the raw ore is mainly hosted in pyrite,and most of pyrite is embedded in quartz and feldspar particles in the form of fine and micro-fine particles.The content of natural gold in the raw ore is very low,and mostly exist in the form of individual natural gold particles.Gold-bearing mineral pyrite,galena and sphalerite have a relatively high liberation degree when the raw ore is ground to P_(80)=0.074 mm(-0.074 mm particle size content accounts for 80%),which is in favour of recovering by flotation.