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时间:2020-04-22
《极端嗜热硫杆菌浸出黄铁矿-论文.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35卷第7期北京科技大学学报Vb1.35No.72013年7月JournalofUniversityofScienceandTechnologyBeijingJu1.2013极端嗜热硫杆菌浸出黄铁矿王洪江¨,黄明清,王贻明¨,吴爱祥¨,张旭,艾纯明)1)北京科技大学金属矿山高效开采与安全教育部重点实验室,北京1000832)中国科学院微生物研究所,北京100101圜通信作者,E—mail:seango@126.com摘要为了探讨极端嗜热菌在高铁、高酸和高温条件下生物脱硫的可行性,采用从腾冲热海酸性温泉分离出的一株新型极端嗜热硫杆菌开展了四组不同初始pH值条件下的黄铁矿生物柱浸实验.该
2、菌株能耐受pH值为0.58、全铁质量浓度为38.9g.L的高酸高铁环境,同时维持580~640mV的较低电位.初始pH值为2时,浸出28d后黄铁矿浸出率达到最高为17.8%.生物浸出时,菌株生长依次表现出较明显的迟缓期、对数期和稳定期,且降低初始pH值会延长其到达稳定期的时间.此外,70℃高温和全铁质量浓度为38.9g.L的高铁体系能促进生成黄钾铁矾和少量单质硫沉淀,而菌株能在pH值小于0.9时将大部分s。氧化为sol一.关键词黄铁矿;生物浸矿;生物脱硫;酸性;表面形貌分类号TF803.21;TD75+2.2Bioleachingofpyritebyextremethermophili
3、cThiobaciUusWANGHong-jiangl1,HUANGMing—qing1,WANGYi.ming¨,WUAixiang¨,ZHANGXu,AIChun.ming)1)KeyLaboratoryoftheMinistryofEducationofChinaforHigh—EficientMiningandSafetyofMetalMines,UniversityofScienceandTechnologyBeijing,Beijing100083,China2)InstituteofMicrobiology,ChineseAcademyofSciences,Beijing
4、100101,China函Correspondingauthor,E-mail:seango@126.c0囊1ABSTRACTInordertoinvestigatethefeasibilityofbiodesulfurizationbyanextremethermophileinhighironconcentration,highacidityandelevatedtemperatureenvironment,fourgroupsofpyritecolumnbioleachingexperimentsatvariableinitialpHvalueswerecarriedoutbyu
5、singanovelstrainofextremethermophilicThiobacilluswhichwasisolatedfromRehaiacidichotspringinTengchonginsouthwesternChina.Itisf0undthatthenewstrainisresistanttohighacidandhighironenvironmentinwhichthepHvalueis0.58andthesolubleironconcentrationis38.9g-L一,whiletheredoxpotentialmaintainsatalowlevelfr
6、om580to640mV.Thehighestvalueofironrecoverycanreachupto17.8%afterleachingfor28dwhentheinitialpHvalueis2.Thebacterialgrowthevidentlyrepresentsalagphase,alogarithmicphaseandastationaryphasesequentiallyinthetraditionalbioleachingroute,whilereducingtheinitialpHvaluecanprolongthetimeofreachingthestead
7、yperiodica1.Inaddition,precipitationformationofjarositeandalittlesulfurispromotedinthehighironsystemofwhichthetotalironconcentrationis38.9g·Landthetemperatureis70℃.ThenovelstraincanoxidizethemajorityofStosol—evenwhenthepHval
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