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时间:2020-06-01
《高镁型低品位硫化镍矿浸出工艺及机理.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第24卷第6期中国有色金属学报2014年6月Volume24Number6TheChineseJournalofNonferrousMetalsJune20l4文章编号:1004-0609(2014)06.1599.08高镁型低品位硫化镍矿浸出工艺及机理刘欣伟,胡文韬,李浩然,冯雅丽(1.中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190;2.北京科技大学土木与环境工程学院,北京100083摘要:采用硫酸铵焙烧一水浸出一细菌浸出处理工艺,研究高镁型低品位硫化镍矿的浸出工艺路线及矿物的转化机理。结果表明:镍、铜、镁和铁的浸出率分别可达93.24%、92.
2、07%、62.67%和63.39%;焙烧和细菌浸出对矿物都有选择性,焙烧过程中含铁较高的蛇纹石易与硫酸铵相作用,铁元素生成无水铁铵矾,镁元素生成()2Mg2(SO4)3和镁橄榄石,和原矿中的橄榄石一起在水浸、细菌浸出过程中溶解进入溶液。含铁量较低的蛇纹石在焙烧、水浸过程中基本不发生变化,只有少量铁元素在细菌浸出过程中被浸出,而镁随蛇纹石损失于细菌浸出渣;含铜、镍矿物同硫酸铵相作用生成硫酸盐,在水浸、细菌浸出过程中进入溶液:磁黄铁矿焙烧后生成的赤铁矿在水浸、细菌浸出过程中被少量浸出,剩余部分残留于细菌浸出渣,造成氧化铁的损失。关键词:硫化镍矿;硫酸铵焙烧;嗜酸氧化亚铁硫杆
3、菌;微生物浸出;选择性浸出中图分类号:TD952文献标志码:ALeachingprocessandmechanismofhighmagnesiumlow—gradenickelsulfideoreLIUXin—wei,HUWen—tao,LIHao.ran,FENGYa.1i(1.StateKeyLaboratoryofMultiphaseComplexSystems,InstituteofProcessEngineering,ChineseAcademyofSciences,Beijing100190,China;2.SchoolofCivilandEnvironme
4、ntalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China)Abstract:Theleachingprocessandmechanismofhighmagnesiumlowgradenickelsulphideorewerestudiedbyammoniumsulfateroasting-waterleaching-bacterialleachingtechnology,andthemineraltransformationmechanismwasalsoresearched.
5、TheresultsshowthattheleachingratesofNi,Cu,MgandFeare93.24%,92.07%,62.67%and63.39%,respectively.Theroastingandbacterialleachingprocessesareselectiveforminerals.Theserpentinewithhighironcontentiseasytoreactwithammoniumsulfateintheroastingprocess.Ironelementinserpentinegeneratesanhydrousamm
6、oniumalum.Magnesiumelementinserpentinegenerates(NH4)2Mg2(SO4)3andforsterite,whichdissolveintothesolutionintheprocessofwaterandbacterialleachingwitholivineintheore.Theserpentinewithlowironcontentbasicallydoesnotchangeintheprocess,onlyasmallamountofironelementisleachedinthebacterialleachin
7、gprocess,whilemagnesiumisnoteasytobeleachedandfinallyleftinbacterialleachingslag.Copperandnickelsulfidemineralsreactwithammoniumsulfatetoformsulfate,whichdissolveinsolutioninthewaterandbacterialleachingprocess.Pyrrhotitegenerateshematiteintheroastingprocess,liRlepartofwhi
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