Now showing items 1-10 of 50
Jarosite pseudomorph formation from arsenopyrite oxidation using Acidithiobacillus ferrooxidans
(Elsevier B.V., 2010-09-01)
In this work, the oxidizing action of a native strain type A. ferrooxidans on a sulphide containing a predominance of arsenopyrite and pyrite has been evaluated. Incubation of the A. ferrooxidans strain in flasks containing ...
SOLUBILITY OF SODIUM-JAROSITE AND SOLUTION SPECIATION IN THE SYSTEM FE(III)-NA-H2SO4-H2O AT 70 DEGREES C
(ELSEVIER SCIENCE BV, 2007)
The aim of this work was to study the formation and chemical equilibrium of sodium-jarosite in synthetic Fe(III)-Na-HSO4-H2O solutions at 70 degrees C. Solutions were prepared adding sodium as NaOH and ferric iron as ...
Jarosite versus Soluble Iron-Sulfate Formation and Their Role in Acid Mine Drainage Formation at the Pan de Azúcar Mine Tailings (Zn-Pb-Ag), NW Argentina
(Open Access Mining & Mineral Processing Journal, 2014-05)
Secondary jarosite and water-soluble iron-sulfate minerals control the composition of acid mine waters formed by the oxidation of sulfide in tailings impoundments at the (Zn-Pb-Ag) Pan de Azúcar mine located in the Pozuelos ...
Raman spectroscopy and x-ray fluorescence in molecular analysis of yellow blocks from the archeological site playa miller 7 (northern Chile)
(Sociedad Chilena de Quimica, 2013)
Yellow blocks from the archaeological site Playa Miller 7 (PLM7), on the coast of Atacama Desert in northern Chile, were analyzed by Raman spectroscopy and X-ray fluorescence (XRF) portable. Our results identify for the ...
Mineralogical control on arsenic release during sediment water interaction in abandoned mine wastes from the Argentina Puna.
(Elsevier Science, 2016-04)
The sulfide-rich residues of La Concordia mine, Argentina Puna, are accumulated in tailing dams that remainedexposed to the weathering agents for almost 30 years. In such period of time, a complex sequence of redoxand ...
Oxidative dissolution of research-grade minerals by Thiobacillus ferrooxidans and Thiobacillus thiooxidans
(Soc Brasileira Microbiologia, 1997-01-01)
Solution- and solid-phase changes associated with galena (PbS) and sphalerite (ZnS) oxidation by T. ferrooxidans and T. thiooxidans, were determined. In experiments with galena, anglesite (PbSO4) was detected as a solid-phase ...
Simulating the main stages of chalcopyrite leaching and bioleaching in ferrous ions solution: An electrochemical impedance study with a modified carbon paste electrode
In this work, we present an electrochemical study using a carbon paste electrode modified with chalcopyrite (CuFeS2) in solution A of T&K medium with different ferrous ion concentrations, in the absence and presence of the ...
Effect of redox potential on chalcopyrite dissolution imposed by addition of ferrous ions
Copper is one of the metals with great economic interest and about 70% of it is found in nature as chalcopyrite mineral (CuFeS2). Due to its slow dissolution kinetics, chalcopyrite dissolution is still a challenge for ...
Tratamiento de los residuos del proceso Jarosita de la industria metalúrgica del zinc, con la finalidad de mitigar este pasivo ambiental
(Universidad Nacional de Ingeniería, 2015)