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Biooxidation-thiosulfate leaching of refractory gold concentrate

International Journal of Minerals,Metallurgy and Materials 2020年第8期27卷 1075-1082页

作者： He-fei Zhao Hong-ying Yang Lin-lin Tong Qin Zhang Ye Kong key laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was *** studies on the concentrate showed that very fine gold grains(<10μm)were encapsulated in pyrite and arsenopyr... 详细信息

A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was *** studies on the concentrate showed that very fine gold grains(gold was only 21%.The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold *** gold leaching efficiency obtained by direct cyanidation was only 59.86%.After biooxidation pretreatment,the sulfide minerals were almost completely decomposed,92 wt%of the mineral particles of the biooxidation residue were decreased togold in the biooxidation residue was over 86%.Meanwhile,the gold content in the biooxidation residue was enriched to 55.60 g/t,and the S,Fe,and As contents were reduced to approximately 19.8 wt%,6.97 wt%,and 0.13 wt%,*** thiosulfate was used for gold extraction from the biooxidation residue of the refractory gold *** results showed that the optimal reagent conditions were 0.18 M thiosulfate,0.02 M copper(II),1.0 M ammonia,and 0.24 M *** these conditions,a maximum gold leaching efficiency of 85.05%was obtained.

关键词： thiosulfate leaching gold biooxidation refractory gold concentrate process mineralogy

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Biofilm inhibition and corrosion resistance of 2205-Cu duplex stainless steel against acid producing bacterium Acetobacter aceti

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Journal of Materials Science & Technology 2019年第11期35卷 2494-2502页

作者： Dan Liu Ru Jia Dake Xu Hongying Yang Ying Zhao Msaleem Khan Songtao Huang Jiankang Wen Ke Yang Tingyue Gug School of Metallurgy Northeastern UniversityShenyang110819China Mary Kay O'Connor Process Safety Center Artie McFerrin Department of Chemical EngineeringTexas A&M UniversityCollege StationTX 77843USA Shenyang National laboratory for Materials Science Northeastern UniversityShenyang110819China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518055China Institute of Metal Research Chinese Academy of SciencesShenyang110016China General Research Institute for Nonferrous Metals Beijing100088China Department of Chemical and Biomolecular Engineering Institute for Corrosion and Multiphase TechnologyOhio UniversityAthensOH 45701USA

Acid producing bacterium Acetobacter aceti causes pitting corrosion of stainless steel(SS).This work investigated the enhanced resistance of 2205-Cu duplex stainless steel(DSS)against biocorrosion by *** in comparison with 2205 DSS using electrochemical and surface analysis *** the addition of Cu to 2205 DSS,biofilms on the 2205-Cu DSS surface were inhibited *** largest pit depth on 2205-Cu DSS surface in the presence of A aceti was 2.6μm,smaller than 5.5μm for 2205 DSS *** i(corr)was 0.42±0.03μA cm^-2 for 2205-Cu DSS in the biotic medium,which was much lower than that for 2205 DSS(3.69±0.65μA cm^-2).All the results indicated that the A aceti biofilm was considerably inhibited by the release of Cu^2+ions from the 2205-Cu DSS matrix,resulting in the mitigation of biocorrosion by A aceti.

关键词： Duplex stainless steel Acid producing bacteria Microbiologically influenced corrosion Pitting corrosion

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