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黄金科学技术 ›› 2020, Vol. 28 ›› Issue (2): 278-284.doi: 10.11872/j.issn.1005-2518.2020.02.094

• 采选技术与矿山管理 • 上一篇    

缅甸实皆省某金矿工艺矿物学研究

傅开彬1,2(),王维清1,2,赵涛涛3,龙美樵1,2,侯普尧1,2,杜明霞1,2   

  1. 1.固体废物处理与资源化教育部重点实验室,四川 绵阳 621010
    2.西南科技大学环境与资源工程学院,四川 绵阳 621010
    3.四川省海蓝晴天环保科技有限公司,四川 成都 610045
  • 收稿日期:2019-06-20 修回日期:2019-11-24 出版日期:2020-04-30 发布日期:2020-05-07
  • 作者简介:傅开彬(1975-),男,四川威远人,副教授,从事难处理矿石选矿方面的研究工作。fukaibin@126.com
  • 基金资助:
    四川省科技计划项目“纳米气泡气浮修复重金属污染土壤应急关键技术和装备研发”(编号:2018GZ0403或18ZS2114)和北京市工业典型污染物资源化处理重点实验室项目“基于电化学的铜锌多金属尾矿‘两段’细菌浸出工艺研究”(ROT-2019-YB5)

Mineralogical Characterization of a Gold Ore in Sagaw Province,Myanmar

Kaibin FU1,2(),Weiqing WANG1,2,Taotao ZHAO3,Meiqiao LONG1,2,Puyao HOU1,2,Mingxia DU1,2   

  1. 1.Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Mianyang 621010,Sichuan,China
    2.School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China
    3.Sichuan Hailan Qingtian Environmental Protection Technology Co. , Ltd,Chengdu 610045,Sichuan,China
  • Received:2019-06-20 Revised:2019-11-24 Online:2020-04-30 Published:2020-05-07

摘要:

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。

关键词: 缅甸, 金矿, 工艺矿物学, 硫化矿, 单体解离

Abstract:

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 is 3.94%.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 adherent-gold 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.

Key words: Myanmar, gold mine, process mineralogy, sulfide, mineral liberation

中图分类号: 

  • TF11

表1

原矿元素组成"

化学成分质量分数化学成分质量分数
SiO247.65P2O50.29
Fe2O310.38MnO0.16
Al2O313.36Cr2O30.09
CaO11.37Co3O40.06
SO37.67BaO0.05
MgO3.34ZrO20.02
NaO3.22Au*5.13
K2O1.45C<0.05
TiO20.99As<0.05

表2

原矿矿物组成及其含量"

金属矿物分子式质量分数脉石矿物分子式质量分数
黄铁矿FeS214.75石英SiO231.53
黄铜矿CuFeS2少量斜长石Na[AlSi3O8]-Ca[Al2Si2O8]18.73
磁铁矿Fe3O4少量方解石CaCO313.43
斑铜矿Cu5FeS4少量绿泥石Y3(Z4O10)(OH)2·Y3(OH)68.47
自然金Au<0.01白云母KAl2(AlSi3O10)(OH)29.79
其他金属矿物3.3

表3

金物相分析结果"

矿相金品位/×10-6分布率/%
单体金粗颗粒单体金0.3010.87
微细单体金4.4085.75
总单体金3.9496.62
包裹金碳酸盐包裹金0.00770.15
石英和硅酸盐矿物包裹金0.0120.24
硫化矿包裹金0.152.99
褐铁矿包裹金0.000.00
总包裹金0.133.38
合计4.07100.00

图1

单体金SEM(a)和EDS(b)分析结果"

表4

原矿筛析结果"

-0.074 mm含量占比/%筛析粒级/mm产率/%品位/×10-6金分布率/%金累计分布率/%
70+0.1655.635.125.305.30
-0.165~+0.07425.195.3724.8430.14
-0.074~+0.03827.845.2626.957.04
-0.038~+0.02521.665.5522.179.14
-0.02519.685.7720.86100.00
原矿1005.44100-
80+0.1655.465.345.305.30
-0.165~+0.07413.495.1912.8118.11
-0.074~+0.03828.845.3928.4346.54
-0.038~+0.02524.665.7926.1172.65
-0.02527.555.4327.35100.00
原矿1005.47100-
90+0.1654.855.544.844.84
-0.165~+0.0745.275.665.3710.21
-0.074~+0.03829.375.3728.3838.59
-0.038~+0.02528.815.3227.5866.17
-0.02531.75.9333.83100.00
原矿1005.56100-

图2

原矿光学显微镜照片Py-黄铁矿;Ccp-黄铜矿;Qtz-石英;Cal-方解石;Ms-白云母;Pl-斜长石"

表5

金单体解离度测定结果"

粒级/mm

单体

占比/%

连生体

连生体

占比/%

连生关系占比/%连生体体积(V)大小分布率/%
脉石金+脉石V>3434>V>1212V>14V<14
+0.42010099.510.49--6.2393.77
-0.42~+0.09632.5667.4499.340.660.542.546.5490.38
-0.096~+0.07496.733.2799.210.7916.5418.9725.8738.62
-0.07498.721.2899.560.4422.5432.4738.546.45

图3

dmax<0.1 mm重砂单体解离金的SEM分析"

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