海南抱伦金矿工艺矿物学研究

Process Mineralogy of Baolun Gold Mine in Hainan Province

采用化学分析、X射线衍射、光学显微镜及扫描电子显微镜分析等检测技术,对抱伦金矿原矿石进行工艺矿物学研究,为选矿工艺的选择提供理论依据.结果表明:该矿石含金10. 1 g·t^-1,含硫0. 65%,主要脉石矿物为石英和白云母,属低硫石英脉型金矿.矿石中的金矿物主要为自然金,质量分数为90. 58%.金矿物粒度范围广,巨粒金(>300μm)、粗粒金(74~300μm)、中粒金(37~74μm)、细粒金(10~37μm)及微粒金(0. 10~10μm)的质量分数分别为3. 84%,28. 85%,18. 04%,23. 52%和25. 75%.金矿物在矿石中的赋存状态为包裹金、粒间金和裂隙金,质量分数分别为48. 37%,43. 24%和8. 39%.在工艺矿物学研究的基础上,提出多段磨矿配合尼尔森重选-浮选的选矿工艺流程.

In this work, the characterization of process mineralogy of the gold ore from Baolun gold mine was studied through chemical analysis, X-ray diffraction, optical microscope and scanning electron microscope analysis. That can provide a theoretical basis and guideline to select ore dressing process. The results show that the Au and S contents of the ore are 10.1 g · t ^-1 and 0.65 %, respectively, and the main gangue minerals are quartz and muscovite. The gold minerals in the ore are mainly native gold with the relative content of 90.58 %. The particle size range of gold mineral is wide, and the contents of giant-grained gold(>300 μm), coarse-grained gold( 74~ 300 μm), medium-grained gold(37~74 μm), fine-grained gold(10~37 μm)and micro-grained gold(0.10~10 μm)are 3.84 %, 28.85 %, 18.04 %, 23.52 % and 25.75 %, respectively. The occurrence state of gold minerals in the ore is wrapped by gold, intergranular gold and fissure gold, the content of which accounts for 48.37 %, 43.24 % and 8.39 %, respectively. Based on the researches of process mineralogy, a Knelson gravity separation-flotation technology cooperated with multi-stage grinding process is proposed.