摘要
焦家金矿选矿厂目前的日处理量达12000吨/天,金回收率92%。选矿厂已将破碎段产品用双螺旋分级机洗矿,洗矿的矿泥产率为7%,矿泥单独浮选,整体工艺初步实现了泥砂分选。为进一步提高选金回收率,流程改造拟将磨矿-浮选系统的旋流器溢流产品二次分级,分级的次生矿泥与洗矿矿泥进入矿泥浮选系统一并浮选,为了掌握旋流器溢流产品的性质,本文采用偏光反光两用显微镜、扫描电镜、X射线衍射仪、红外光谱和差热分析等手段进行研究。研究结果表明矿物种类主要是金属硫化物和脉石矿物,金属硫化物约占4%,脉石约占96%,金属硫化物主要是黄铁矿（70.17%）和黄铜矿（16.27%）,脉石主要是石英（47.12%）和长石（15.90%）。黄铁矿和石英是重要的载金矿物,黄铁矿含金65%,石英含金20%。颗粒越细,单体颗粒含量越高,连生体颗粒含量越少;颗粒越细,黄铁矿含量越高,Au、Ag分布率越高,-0.037 mm粒级中黄铁矿含量达到73.58%,Au、Ag占到47.99%和56.60%,金分配率与黄铁矿含量成正相关;粗粒级中未发现金颗粒,中等粒级中次显微金约占30%,细粒级中次显微金约40%,金粒径在2~10μm范围内;金形状有三角形、棱角状、小粒状、不规则状等。红外光谱与差热曲线研究发现颗粒越细矿物成分趋于复杂。研究结论为磨矿分级产生的次生矿泥浮选调控提供了依据,对矿泥浮选的药剂制度调控、浮选流程确定等具有重要实际意义。
The capacity of ore treatment reached 12,000 t /d and gold recovery achieved 92% in the Jiaojia Gold Mine.Broken product has been washed with double spiral classifier,and the ore slime yield was 7%.The ore slime had also been flotation selected alone,which realized preliminary separation between slime and coarse sand.To further improve the gold recovery rate,the practice procedure was modified to subdivide the hydrocyclone in a grinding-flotation system,and the secondary and main slime was pumped into the current slime flotation system.In order to study the nature of overflow products,the experimental instruments were used in the test with Glance Polarizing Microscope, Stereoscopic Microscope, Scanning Electron Microscopy（ SEM）, X-ray Diffraction（XRD）,Infrared Spectrum（IR） and Differential Thermal Analysis（DAT）.Research results showed that the mineral species were composed of 4% metal sulfides and 96% gangue minerals.The metal sulfides consisted of about 70.17% pyrite and 16.27% chalcopyrite,whereas the gangue minerals were mainly quartz（about 47.12%）and feldspar（15.90%）.The 65% gold was mainly hosted in pyrite and 20% in quartz.The particle size was finer,the content of single particles was higher and the conjuncture particles were less.The grain was finer,the pyrite content was higher and the distribution rate of Au and Ag was higher.The pyrite content reached 73.58% and Au Ag accounted for 47.99% and 56.60% in-0.037 mm graded particles.The positive correlation was between gold allocation and pyrite content.Gold was not found in coarse grain,microscopic gold accounted for about 30% in medium grain and about 40% of gold in the fine fraction grain.Gold particle size was 2 to 10 microns in the range.Gold shapes were triangle,angular,small granular,irregular shape,etc.Based on infrared spectrum and differential thermal curve,it was found that the finer grain particle had a more complicated composition.Research conclusion provided the regulation for slime flotation from grinding-classification,which has an important practical significance for reagent regulation of slime flotation and determining flotation process.
出处
《岩矿测试》
CAS
CSCD
北大核心
2014年第4期535-544,共10页
Rock and Mineral Analysis
基金
江西省教育厅青年基金项目(GJJ12362)
山东省博士后创新基金项目(201302013)
山东黄金集团有限公司博士后科研项目(BSH-2012-06)
江西理工大学校级科研基金重点项目(NSFJ2014-K04)
关键词
焦家金矿
旋流器溢流产品
金回收率
解离度
扫描电镜
X射线衍射法
红外光谱法
差热分析
Jiaojiagold mine
overflowElectron Microscopy
X-ray Diffraction
product from hydrocyclone
gold recovery
Infrared Spectrometry
Differential Thermaldissociation degree
ScanningAnalysis
