胶东蚀变岩型金矿石工艺矿物学性质研究

Study on Technological Mineralogy Properties of Altered Rock-type Gold Ore from Jiaodong

利用化学分析法、透反射偏光显微镜、X射线衍射、分析型扫描电镜、电子探针能谱仪等测试手段对胶东蚀变岩型金矿石的工艺矿物学性质进行系统研究。结果表明,矿石类型属于低硫含金黄铁矿矿石;矿石中金元素主要以自然金的形式存在,自然金占66.67%,其次为银金矿,占33.33%。矿石中金矿物平均成色为720.44,自然金平均成色为829.72,银金矿平均成色为784.77;金矿物粒度以细粒、微细粒为主。矿石中自然金和银金矿粒度大部分为5～37μm,该粒度范围内的金颗粒累计体积分数为99.83%。矿石中金矿物易于解离,粗磨粒度-75μm粒级达56%～65%时,自然金和银金矿解离率可以达到94%左右,可以获得良好的浮选指标。

Chemical analysis method, Refection Polarizing Microscope （PMR-POL）, X-ray Diffraction （XRD）, analysis type Scanning Electron Microscope （SEM）, and Electron Microprobe Analysis （EMPA） to study the technological mineralogy and sorting properties of gold ore in Jiaodong altered rock-type has been comprehensively applied. The results show that the technological type of this ore belongs to low sulfide and gold-bearing pyrite. 66.7% of the gold occurred in the natural form, with electrum making up the remaining 33.33%. The average purity of gold in this ore was 720.44, natural gold was 829.72, and electrum was 784.77. Pyrite was the major carrier of gold. The gold was primarily of fine or ulter-fine particles in the range of 5 - 37 μm. The accumulation volume in this range of sizes was 99.83%. Gold in this ore is easy to liberate. Under the condition of about 55% -65% with coarse grinding less than 75μm, the disaggregation rate of gold in natural form and sulfide inclusion forms can reach about 94% and obtain a good flotation index in the process of flotation.