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1、生物浸铜液论文：高铁生物浸铜液回收铜及除铁工艺研究【中文摘要】生物浸铜技术能经济有效的处理低品位、难回收铜矿,应用前景广阔。但生物浸铜液含铁较高时,不利于铜的萃取。本文以高铁生物浸铜液为原料,采用硫化沉淀-双氧水氧化浸出-蒸发浓缩工艺制备硫酸铜,并采用热熔法回收渣中的单质硫。再分别采用氧化沉淀法和黄钠铁矾法除去回收铜后液中的铁,废水实现循环利用。具体研究结果如下：与硫化钠比较,硫化氢沉铜所需硫化剂用量较少,不产生氢氧化铁沉淀,更适合处理生物浸铜液。当硫化氢与铜的物质的量比为1.9：1,pH值为1,反应温度为30℃,搅拌速度为500r-min-
2、1,反应时间为3h时,硫化氢处理生物浸铜液,其铜沉淀率接近100%,Fe3+【英文摘要】Thebioleachingcoppertechnologyisaneconomicaleffectivemethodfortreatinglowgradeanddifficultrecoverycopperores,whichhasabroadapplicationprospect.Buttheironcontentofcopperbioleachingsolutionishigher,whichhasansideeffectonthesolventex
3、tractionofcopper.Coppersulfatepentahydratewaspreparedfromcopperbioleachingsolutionbysulfideprecipitation,hydrogenperoxideleachingandevaporativeconcentrationprocess,andtheelementalsulfurwasrecoveredfromslagsbyhotmeltingmethod.Futhermore,theironofthesolutionafterrecoveringcop
4、perwasremovedbyoxidizingsedimentationmethodandsodiumjarositemethodandthewastewaterwasrecycled.ComparedwithNa2Smethod,treatingcopperbioleachingsolutionbyH2Smethodneedslessagent,andnoFe(OH)3gelsareformed.TheprecipitationrateofCuwas100%andthereductionofFe3+was91%byH2Streatment
5、whenthemolarratioofH2S:Cuwas1.9:1,thesolutionpHvaluewas1,thereactiontemperaturewas30℃,andthereactiontimewas3h.ThemainphaseofsedimentswerebothCuSandS,ofwhichtheCucontentwas45%.Coppersulfidesedimentwasleachedbyhydrogenperoxideandsulphuricacid.Thecopperleachingratewas92.1%unde
6、rtheconditionsofmolarratioofhydrogenperoxidewithcopper,reactiontemperature,liquid-solidratio,concentrationofsulfuricacid,andreactiontimeweresettobe6.4:1,50℃,15:1,3mol·L-1and2h,respectively.CuSO4·5H2Owasobtainedbyevaporativecoolingcrystallizationprocesswhenthevolumeofsolutio
7、nafterevaporationandconcentrationwas1/2ofthestocksolutionunderthecoolingtemperatureof6℃.ThepurityofobtainedCuSO4·5H2Owas96%,anditsqualitysatisfiesthestandardofindustrialcoppersulfate(GB437-93).Elementarysulfurwasrecoveredfromsulfursedimentbyhotmeltingwhenthescreendiameterwa
8、s38μmandthefiltrationtemperaturewas145℃.Thepurityofobtainedelementarysulfurwas99.9
