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Flotation characteristics of arsenopyrite
1982Electrochemical methods, surface spectroscopy and flotation tests have been used to study the influence of the oxidation of arsenopyrite on its floatability with xahthate. Cyclic voltammetric studies indicated that the oxidation of arsenopyrite at pH greater than 7 results in the formation of ferric hydroxide deposits on the surface of the mineral ...
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Arsenopyrite weathering under conditions of simulated calcareous soil
Environmental Science and Pollution Research, 2015Mining activities release arsenopyrite into calcareous soils where it undergoes weathering generating toxic compounds. The research evaluates the environmental impacts of these processes under semi-alkaline carbonated conditions. Electrochemical (cyclic voltammetry, chronoamperometry, EIS), spectroscopic (Raman, XPS), and microscopic (SEM, AFM, TEM ...
Lara, René H. +9 more
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Pyrite, marcasite, and arsenopyrite type minerals: Crystal chemical and structural principles
Physics and Chemistry of Minerals, 1981Quantitative molecular orbital (MO) calculations and qualitative perturbational MO arguments are used to interpret the spectra and structure of transition metal dichalcogenides and related compounds. Competition between pyrite (FeS2), marcasite (FeS2) and loellingite (FeAs2) structure types is explained in terms of the number of electrons occupying a ...
Tossell, J. A. +2 more
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Electrochemical oxidation of arsenopyrite in acidic media
International Journal of Mineral Processing, 1997Abstract Arsenopyrite (FeAsS) is a common sulfide mineral in base metals and precious metals ores and concentrates. The treatment of these kinds of ores involves frequently an oxidation step to improve metal recoveries. The study of the mechanisms occurring during the arsenopyrite oxidation is then necessary to optimize industrial processes, like ...
Isabel Lázaro +3 more
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Depression mechanism involving Fe3+ during arsenopyrite flotation
Separation and Purification Technology, 2019Abstract The removal of arsenic-bearing minerals from concentrates is an important environmental objective, especially in relation to metallurgical processing. In this regard, there has recently been interest in the effects of ionic species on the flotation performance of minerals in liquid phases.
Li Yu +5 more
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Arsenopyrite Oxidation with Ozone: Stoichiometry and Kinetics
Ozone: Science & Engineering, 2018When the recovery of precious metals by standard cyanidation is less than 80%, the ore is classified as refractory and needs an oxidizing pretreatment before cyanidation. Arsenopyrite is one of the main sulfide matrixes where occurs refractory gold. In this work, the arsenopyrite leaching in acid media was studied using ozone as an oxidizing agent. The
C. Rodríguez-Rodríguez +2 more
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Electrochemical Contribution of Pyrite in Arsenopyrite Reactivity
ECS Meeting Abstracts, 2006Abstract not Available.
Gustavo Urbano +3 more
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Bacterial oxidation of arsenopyrite and enargite
Economic Geology, 1964In the bacterial oxidation of arsenopyrite under laboratory conditions, almost twice as much arsenic was brought into solution by bacterial oxidation as by spontaneous oxidation; iron was only slightly affected. In experiments with enargite, bacterial oxidation produced a sixfold enhancement of the solution of copper and iron, but had little effect on ...
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Semiconductivity in pyrite, marcasite and arsenopyrite phases
Journal of Physics and Chemistry of Solids, 1964Abstract Over the past two years the synthesis in our laboratory of a number of new pyrite, marcasite and arsenopyrite phases has been reported. In the present article these results are systematically summarized and the crystal chemistry of the compounds as well as some of their electrical and magnetic properties are interpreted in terms of a simple ...
F. Hulliger, E. Mooser
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