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1、第 24卷第 2期中国有色金属学报2014年 2月Volume 24 Number 2TheChinese JournalofNonferrousMetalsFebruary2014文章编号:10040609(2014)02051108 高铁锌焙砂选择性还原焙烧−两段浸出锌111211韩俊伟,刘维,覃文庆,柴立元,郑永兴,杨康(1.中南大学资源加工与生物工程学院,长沙410083;2.中南大学冶金与环境学院,长沙410083)摘要:采用还原焙烧将高铁锌焙砂中的铁酸锌选择性地分解为氧化锌和磁铁矿,再通过两段浸出工艺回收锌,以实现锌铁分离和获得以磁铁
2、矿为主的浸出渣。主要考察了还原焙烧、中性浸出及低酸浸出条件对锌焙砂中锌、铁浸出率的影响。结果表明:通过还原焙烧可以显著地提高锌焙砂的锌浸出率;中性浸出的最佳条件为浸出温度60 ℃、液固比10:1、初始酸度45 g/L和浸出时间2 h;低酸浸出的最佳条件为浸出温度70 ℃、液固比10:1、初始酸度60 g/L、搅拌速度300r/min和浸出时间2h。在最佳条件下,两段浸出的总锌浸出率约为90%,总铁浸出率约为5%。经XRD和SEM/EDS分析,浸出渣以磁铁矿为主,其次是闪锌矿和铁酸锌;铁酸锌存在的主要原因是在还原焙烧过程中被氧化锌等矿物包裹,使其分
3、解不充分。关键词:高铁锌焙砂;铁酸锌;还原焙烧;浸出中图分类号:TD952 文献标志码:ALeaching zincfromhigh ironbearingzinc calcine after selective reduction roasting111211HANJunwei,LIUWei,QINWenqing ,CHAILiyuan ,ZHENGYongxing ,YANGKang (1.SchoolofMinerals ProcessingandBioengineering,CentralSouth University,Changsha
4、410083,China;2.SchoolofMetallurgyandEnvironment,CentralSouth University,Changsha410083,China)Abstract:Basedon the decomposition ofzincferritetoZnOand Fe3O4byreduction roasting,the recoveryofzincfromtheroastedzinccalcinewasstudiedbytwostage leachingforzinciron separationandthe
5、leachingresiduecontaining Fe3O4wasobtained.The effects ofreduction roastingandconditions ofneutralleachingand acid leachingon leaching ratesofzincand iron were investigated,respectively.The results showthatthe reduction roastinghasa significanteffecton recoveryofzinc,and the
6、leachingrates ofZn and Fe are about90%and 5%,respectively.Underthe following optimumconditions,which are leachingtemperatureof60 ℃,liquid/solidratioof10:1,acid concentration of45 g/Land leachingtime of2 hforneutralleaching,andleachingtemperatureof70 ℃,liquid/solidratioof10:1,
7、acidconcentration of60 g/L,stirringspeed of300 r/min and leachingtime of2 h foracid leaching.Besides,the main compositionsofthe residue are Fe3O4,ZnSand ZnFe2O4accordingtothe XRDandSEM/EDSanalysis. Themain reason ofzincferriteleftis attributedtothe enclosure byotherminerals.K
8、eywords:high ironbearingzinccalcine;zincferrite;reduction roasting;l