典型文献
Pyrite oxidation in column at controlled redox potential of 900 mV with and without bacteria
文献摘要：
Comparisons on the bioleaching and sterile oxidation of pyrite were performed at controlled redox potential of 900 mV(vs.SHE)and different temperatures of 30 and 60℃.For sterile experiments,the redox potential of irrigation solution was controlled by adding hydrogen peroxide solution(15 wt％),while the redox potential of irrigation solution for bioleaching was elevated by flowing through the packed bed in which bacteria were activated and colonized.The rate of pyrite bioleaching is faster than that of sterile oxidation at temperature of 30℃.The reason is that the potential gradient of leaching solu-tion in bioleaching column is much smaller than that in sterile column.The redox potentials of irrigation solution and leaching solution are similar for bioleaching;however,the redox potential difference of irrigation solution and leaching solution for sterile oxidation is about 150 mV.When temperature increases to 60℃for sterile oxidation,the rate of pyrite leaching is faster than that of bioleaching at temperature of 30℃,even though the redox potential gradient of leaching solution is great.The mineralogy analyses of pyrite residue were performed by scanning electron microscopy-energy-dispersive spectroscopy(SEM-EDS),X-ray diffraction(XRD)and X-ray photo-electron spectroscopy(XPS)analyses.The results confirm that pyrite oxidation might only occur at specific sites with high surface energy on surface and obeys the"indirect mechanism"whether there are bacteria or not.The pyrite oxidation rate is not inhibited by inert sulfur on residue surface at elevated redox potential.According to the con-clusions,the way to accelerate pyrite oxidation is proposed.
文献关键词：
中图分类号：
作者姓名：
He-Yun Sun;Qiao-Yi Tan;Yan Jia;Rong-Bo Shu;Shui-Ping Zhong;Ren-Man Ruan
作者机构：
State Key Laboratory of Biochemical Engineering,Institute of Process Engineering,Chinese Academy of Science,Beijing 100190,China;Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Science,Beijing 100190,China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Institute of Process Engineering,Chinese Academy of Science,Beijing 100190,China;Institute of Multipurpose Utilization of Mineral Resources,Chinese Academy of Geological Sciences,Chengdu 610041,China;State Key Laboratory of Gold Extraction,Zijin Mining Group Co.Ltd.,Shanghang 364200,China
文献出处：
引用格式：
[1]He-Yun Sun;Qiao-Yi Tan;Yan Jia;Rong-Bo Shu;Shui-Ping Zhong;Ren-Man Ruan-.Pyrite oxidation in column at controlled redox potential of 900 mV with and without bacteria)[J].稀有金属（英文版）,2022(12):4279-4288
A类：
Pyrite,clusions
B类：
oxidation,column,controlled,redox,mV,without,bacteria,Comparisons,bioleaching,sterile,pyrite,were,performed,SHE,different,temperatures,For,experiments,irrigation,solution,was,by,adding,hydrogen,peroxide,wt,while,elevated,flowing,through,packed,bed,which,activated,colonized,faster,than,that,reason,gradient,much,smaller,potentials,are,similar,however,difference,about,When,increases,even,though,great,mineralogy,analyses,residue,scanning,electron,microscopy,energy,dispersive,spectroscopy,EDS,ray,diffraction,photo,XPS,results,confirm,might,only,occur,specific,sites,high,surface,obeys,indirect,mechanism,whether,there,not,inhibited,inert,sulfur,According,way,accelerate,proposed
AB值：
0.383217
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