德兴铜矿尾矿地球化学特征

对德兴铜矿1号尾矿库进行系统钻探取样,采用粒度测试,X射线粉晶衍射测试,主、微量元素测试等多种方法,综合研究尾矿的矿物成分、化学成分及赋存状态等特征,探讨尾矿库中不同元素空间分布特征及尾矿可利用性。结果显示:尾矿主要矿物成分为石英和绢云母,金属矿物含量小于1%,以粉砂质为主。排放过程中的重力分选作用使元素从排砂口向远离排砂口方向呈有规律的分带现象。从排砂口向远处,矿物粒度变细,元素可分为S、Cu、Fe、Mo、Ag、Cr→SiO2、Au、Hg→Al2O3、Tl三个分带。德兴铜矿1号尾矿库经过多年的尾矿堆放,矿物及元素的赋存状态和地球化学特征具有继承加改造的双重属性,黄铁矿含量显著下降,绢云母随时间推移更多的风化为伊利石,Cu、Mo、S、Fe、Ca、C等流失,这都是表生地球化学作用的结果。

GEOCHEMICALCHARACTERISTICS OFTAILINGSFROM THEDEXINGCOPPERMINE

TailingsampleswerecollectedbydrillinginNo.1tailingdamfromtheDexingmine.Themulti-elementanalyticalscheme wereapplied.Thetailingsizewasdeterminedbythelasergrainsizeanalyticalinstrument,andthemineralformwasdeterminedbyX-raypowderdiffractometry.Someconclusionshavebeenreached:Themajorparticlesofthetailingaresilty,withquartzandsericiteas themainminerals,whilethecontentofmetalmineralsislessthan1%.Thewater-sortingactionandsupergenegeochemicalprocessin thetailingdamcombinedwithchangesinoregradeandmineralprocessingcausedunevendistributionofelementsandparticlesizesof tailing.Thetailingparticlesizedecreasesinthedirectionofthetailingdischarge,andtheelementscanbedividedinto3zones:Cu, Fe,Mo→SiO2,Au→Al2O3,Tl.Duringthesupergenegeochemicalprocess,thesulfidewasweatheredintooxides,whichledtothe significantdecreaseofthepyritecontent,withthelossofCu,Mo,S,Fe,CaandCintailing.Meanwhilesericitechangedintoillite.