SeriesNo.560February2023金属矿山METALMINE总第560期2023年第2期收稿日期2022-03-22作者简介姜亚雄(1986—),男,高级工程师,博士研究生。通信作者陈禄政(1978—),男,教授,博士研究生导师。强磁选—磁化焙烧—弱磁选工艺回收某尾矿中的菱铁矿姜亚雄1,2汪勇1,2祁磊1,2黄丽娟2陈禄政1(1.昆明理工大学国土资源工程学院,云南昆明650093;2.云南黄金矿业集团股份有限公司,云南昆明650200)摘要云南某尾矿含铁13.88%,主要以菱铁矿的形式存在,具有回收利用价值。采用“强磁选—流态化磁化焙烧—弱磁选”工艺回收铁,考察了矿样焙烧前后铁物相的转变。结果表明,强磁选可以获得产率21.60%、铁品位27.18%、铁作业回收率40.19%的铁粗精矿;铁粗精矿采用550℃预氧化7.5min并在温度450℃、还原势R=0.6条件下还原磁化焙烧7.5min,能保持还原产物中Fe3O4的稳定性,无FeO生成,保证了铁氧化物的高磁性转化率和强适应性,获得产率90.84%、铁品位30.02%的焙砂;焙砂经弱磁选可获得产率35.29%、铁品位60.51%、作业铁回收率71.13%的磁铁精矿。研究成果为尾矿资源综合利用及难处理铁矿资源高效利用提供了有益参考。关键词尾矿菱铁矿强磁选磁化焙烧弱磁选中图分类号TD924文献标志码A文章编号1001-1250(2023)-02-094-07DOI10.19614/j.cnki.jsks.202302013SideriteRecoveryfromaTailingsbyHighGradientMagneticSeparation-MagneticRoasting-LowIntensityMagneticSeparationProcessJIANGYaxiong1,2WANGYong1,2QILei1,2HUANGLijuan2CHENLuzheng1(1.FacultyofLandResourceEngineering,KunmingUniversityofScienceandTechnology,Kunming650093,China;2.YunnanGoldMiningGroupCo.Ltd.,Kunming650200,China)AbstractAtailingsfromYunnanProvinceassays13.88%Fe,anditismainlydistributedintheformofsiderite;there-fore,itdeservesinvestigationforironrecovery.Atechnicalrouteof"highintensitymagneticpreconcentration-fluidizedmagnet-icroasting-lowintensitymagneticseparation"wasproposed,theironphasesofironelementsbeforeandaftertheirroastingwerecompared.Theresultsofinvestigationindicatethatthehighintensitymagneticpreconcentrationprocessproducedaprima-ryironconcentrateassaying27.18%Fewith40.19%ironrecovery,atahighmassweightof21.60%.Thisprimaryironcon-centratewaspre-oxidizedfor7.5minutesunder550℃,andthenitwasreductively-roastedfor7.5minutes,under45...
