缅甸实皆省某金矿工艺矿物学研究

为了查明缅甸实皆省某金矿工艺矿物学特征,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和化学分析等技术手段,系统研究原矿化学组成、矿物组成、粒度分布、金物相、单体解离度和矿石结构构造。结果表明:(1)原矿金品位为5.13×10-6,为主要有价元素。(2)矿石具自形晶粒结构,块状、斑杂状和浸染状构造,矿物组成简单。其中,金属矿物主要为黄铁矿,含少量黄铜矿、磁铁矿和斑铜矿,脉石矿物主要为石英、斜长石、方解石、绿泥石和白云母。(3)矿石中金易单体解离,重矿物中金分布率为3.94%,以单体金形式存在,金成色较好(大于93%),呈角粒状、块状、片状和圆片状;非重矿物中大部分金也已单体解离,游离金分布率为92.68%,包裹金分布率为3.38%。(4)细粒级矿石中金的单体解离度也比较高,-0.074 mm粒级中单体金含量为98.72%,连生体金含量为1.28%,各粒级中金的富集现象不明显。因此,重选-全泥氰化、浮选和重选-浮选等工艺均能有效回收矿石中金。

Mineralogical Characterization of a Gold Ore in Sagaw Province,Myanmar

As trade friction between China and the United States escalates,international concerns about the creditworthiness of the United States will have a negative impact on the status of the dollar as a national currency,countries may increase their holdings of gold and demand for gold will increase.Myanmar is one of the most promising countries for China’s direct mining investment.The gold resources in Burma are abundant and widely distributed. At present,there are few reports on the development and utilization of gold mines in Myanmar. It is of great significance to strengthen basic research on overseas mineral resources and avoid technical risks. Mineral development investment risk is bigger due to lack of basic materials of process mineralogy of a gold mine in sagaing province,Myanmar. The chemical composition,mineral composition,particle size distribution,physical phase and dissociation degree of gold and structure of ore were studied by means of X-ray diffraction(XRD),scanning electron microscope(SEM)and chemical analysis to find out the process mineralogy characteristics of a gold mine in Sagaw Province,Myanmar.The results show that the grade of gold is 5.13×10-6,which is the main valuable element.The ore has autogenous grain structure,block structure,patchy structure and disseminated structure.The mineral composition of the ore is simple,the metal minerals are mainly pyrite(14.75%),a small amount of chalcopyrite,magnetite and porphyry,and the gangue minerals are mainly quartz,plagioclase,calcite,chlorite and white mica. The distribution rate of gold in heavy minerals is3.94%.Free gold is hornlike,massive,flaky and circular,the fineness of gold is good(more than 93%).Gold is easy to dissociate.Most of the gold in the non-heavy minerals has been dissociated,the distribution rate of free gold is 92.68%.The distribution rate of gold parcel is 3.38%.The monomer dissociation degree of fine-grained gold is also relatively high. In the-0.074 mm grain size,The monomer gold content is 98.72%,the adherentgold content is 1.28%. After 60 h of full-mud cyanidation,the gold leaching rate reached 90.19%,which was close to the rule of gold monomer dissociation degree in the gold mine.It is necessary to continue to strengthen the research on the theory and technology of selecting and metallurgy of a gold mine in shijie province and improve its technical and economic indexes.