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that the mixed culture promotes the formation of chalcocite and obviously restrain the passivation layer (sulfur and jarosite). Key words: sulfur-oxidation; X-ray absorption near-edge structure... the precipitation of potassium jarosite in sulfate and chloride media[J]. Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2008, 39(6): 771-783. [2] RODRIGUEZ Y......
that there is a lot of exopolysaccharide, jarosite and ammoniojarosite in biofilm, which plays important role in the formation of biofilm. Key words: Acidithiobacillus ferrooxidans; immobilization; biofilm; ferric... microscope(SEM) and the role of exopolysaccharide, jarosite and ammoniojarosite in the formation of biofilm is discussed.2 Experimental 2.1 Inoculum A. ferrooxidans isolated by the Key Laboratory......
, 1.86, 1.43 and 1.13 g/L, respectively, suggesting that β-phase had a better leaching kinetics than others. SR-XRD and XANES results indicated that jarosite and chalcopyrite were the main components...), chalcocite (Cu2S) and jarosite (KFe3(SO4)2(OH)6) samples used in this study were provided by School of Minerals Processing and Bioengineering, Central South University, Changsha, China. The mineralogical......
)=3 mol/L, T=60 ℃, L/S ratio=2:1, t=60 min. The proposed flowsheet is Cu recovery by M5640→Fe removal by jarosite→Al removal by Na2CO3→Ca, Mg removal by NaF→evaporative crystallization valuable......
of extracted copper. Potassium jarosite is formed during the bioleaching process, the formation of jarosite is related to the mass concentration of iron ion, and it is promoted by high mass concentration of iron......
surfaces are corroded gradually by A. manzaensis, and the XRD results show that the leaching residues contain new compositions of jarosite and elemental sulfur (S0). The iron L-edge XANES spectroscopy... ions, the formation of jarosite could be also accelerated (Eq. (6)). Previous study indicated that the accumulation of jarosite on the surface of minerals could hinder the dissolution [21], which could......
are oxidized to ferric subsulfate, hydrated ferric sulfate and jarosite, resulting in the increasing residue ratio. The residue ratio and the sulfur content in the residue can be decreased by ferric... is higher.In Fig. 4, the presence of FeS2indicates that reaction timeof 2 h is insufficient to ensure a complete oxidation reaction. When reaction time is 4 h, SiO2 and jarosite appear. And the hydrated ferric......
a shrinking core kinetic model. According to this model, the copper solubilization was controlled by diffusion through a product layer (mainly jarosite), while zinc dissolution did not show a defined...) to eliminate jarosite and sulfur from OxFe and OxS, respectively. Cells were harvested using a 0.2 μm membrane and then suspended again in an iron-lacking medium. A suspension containing about 5×108 cell......
the dissolution of marmatite. SEM and XRD analyses of the leaching residues reveal that a product layer composed of elemental sulfur and jarosite is formed on the mineral surface, which results in a low... spectra show that rate-limiting step does not change when Fe3+ ions are added. Key words: marmatite; S. thermosulfidooxidans; bioleaching; jarosite; electrochemical property 1 Introduction Nowadays......
extractions. CB and CN inhibited the growth of bioleaching bacteria and led to the low bioleaching efficiency. X-ray diffraction analysis showed that jarosite and sulfur film were the main components..., respectively. It was probably due to the fact that the passivation layer of jarosite and sulfur was mainly formed, and slightly affected the chalcopyrite dissolution, resulting in the stable copper extractions......