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to the decomposition of chalcopyrite. Jarosite and sulfur are observed as products of bioleaching. The addition of A. thiooxidans during leaching by L. ferriphilum can change the electrochemical control steps......
) analysis indicate that the surface of chalcopyrite is covered with sulfur and jarosite during the bioleaching process by L. ferriphilum. Furthermore, EDS results imply that iron phase dissolves... of the passivation layer that blocked continuous copper extraction is sulfur instead of jarosite. Key words: chalcopyrite; Leptospirillum ferriphilum; surface properties; passivation layer 1 Introduction Chalcopyrite......
by sterile control and microorganisms. Additionally, sulfate (SO42-) is detected on the chalcopyrite surfaces leached by microorganisms, and most of it probably originates from jarosite. The analysis of CV results reveals that metal-deficient sulfide (Cu1-xFe1-yS2-z, y>x) and elemental sulfur (S0) passivate the surface of chalcopyrite electrode. The elemental sulfur and/or jarosite coating......
. ferriphilum than by A. ferrooxidans. The results also show that adjusting the pH values in leaching process baffles leaching pyrite due to the formed jarosite. Jarosite formed in leaching process... important for bioleaching pyrite. Key words: pyrite; A. ferrooxidans; L. ferriphilum; bioleaching; jarosite; redox potential  ......
%, respectively. The XRD results of the leaching residue indicated that three kinds of bornites all produced jarosite in the late stage of leaching, and the leaching residues from of Daye Museum and Yunnan Geological Museum contained a mass of elemental sulfur. XPS analysis and scanning electron microscopy experiments showed that the surface of mineral particles was jarosite and the copper......
that manganese residues which belongs to general industrial solid waste in small particles contain quartz, hydrated calcium sulfate, goethite, jarosite and hydrobasaluminite. The calcium sulfate, goethite, jarosite and hydrobasaluminite are dehydrated at high temperature and decomposed to form anhydrite and hematite. Manganese residues sinter and melt obviously and silicate glass appears through......
Trans. Nonferrous Met. Soc. China 23(2013) 3434-3439 Preparation of ammonium jarosite from clinker digestion solution of nickel oxide ore roasted using (NH4)2SO4 Xiao-yi SHEN, Hong-mei SHAO, Jia-dong... for eliminating Fe3+ from NiSO4 solution, the digestion solution of the clinker was used as raw material, which was obtained from roasting the nickel oxide ore with (NH4)2SO4. The ammonium jarosite......
and the formation of jarosite could be diminished, thus the oxidation efficiency was improved. The oxidation levels of iron and sulfur were improved by 12.50% and 15.49%, and the gold recovery was increased..., the passivation layer because of ferric ion precipitates (such as jarosite) may deposit on the surface of sulfide concentrates impeding their oxidation [11]. Thus, it was necessary to optimize......
holes and inhibit jarosite formation on the chalcopyrite surface, thereby enhancing bioleaching of chalcopyrite under visible light. Key words: bioleaching; chalcopyrite; photogenerated-hole... showed that the main phase compositions of the ore were chalcopyrite, jarosite and sulfur. 2.3 Bioleaching experiments Bioleaching experiments were carried out in 250 mL flasks containing 100 mL......
effect on bacteria growth and the promotion of jarosite production. The electrochemical measurements were used to make further understanding on the dissolution of marmatite with and without additional... the experiment process, which may make it difficult for the thriving of L. ferrooxidans. At the same time, iron (III) precipitation may probably take place in terms of the jarosite forming under higher pH values......