Results 131 to 140 of about 976 (183)
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1989
Abstract Arsenopyrite constitutes the main gold-bearing mineral in various hydrothermal deposits since its average gold content may reach 1,000 to 2,000 ppm. However, arsenopyrite crystals exhibit heterogeneous gold contents covering a wide range from a few ppm to more than 1 percent.
Michel Cathelineau +4 more
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Abstract Arsenopyrite constitutes the main gold-bearing mineral in various hydrothermal deposits since its average gold content may reach 1,000 to 2,000 ppm. However, arsenopyrite crystals exhibit heterogeneous gold contents covering a wide range from a few ppm to more than 1 percent.
Michel Cathelineau +4 more
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The use of dithiophosphates and dithiocarbamates for the flotation of arsenopyrite
Minerals Engineering, 1990The recovery of arsenopyrite from an arsenopyrite/pyrite ore is desirable for a number of reasons. This can be optimized using a two stage flotation process in which a dithiophosphate is added at pH=11 in the first stage and copper sulphate and a dithiocarbamate in the second stage.
O'Connor, C.T. +2 more
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Arsenopyrite: a spectroscopic investigation of altered surfaces
Mineralogical Magazine, 1989AbstractSurfaces of a natural sample of arsenopyrite (FeAsS) were oxidized by a range of inorganic oxidants, and the resultant surface alteration products studied using various spectroscopic techniques. The oxidants used were air during heating to relatively low temperatures (150°C), steam, ammonium hydroxide, hydrogen peroxide, and sulphuric acid ...
Richardson, S., Vaughan, D. J.
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Electrolytic oxidation of arsenopyrite slurries
Minerals Engineering, 1993Abstract Arsenopyritic (FeAsS) gold ore is usually refractory because cyanide solution cannot react with the gold, which is locked within the sulphide lattice. Destruction of the arsenopyrite lattice by electrolytic oxidation is a possible low temperature pretreatment option for refractory arsenopyritic gold ore.
H.G. Linge, W.G. Jones
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The ferric leaching kinetics of arsenopyrite
Hydrometallurgy, 1999In this investigation batch, ferric leaching experiments were carried out in a 100 ml jacketed vessel maintained at 25°C. The parameters varied during the course of the experimental program included the initial redox potential, the total iron concentration, the solids concentration and the pH of the leaching solution.
R. Ruitenberg +3 more
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Electrochemical study of arsenopyrite weathering
Physical Chemistry Chemical Physics, 2002Cyclic voltammograms and capacitance measurements are presented to characterize the mineral response at relatively moderate environmental conditions, pH 4.5 and T = 25 °C. The experiments involve examining the rates of oxidation and the surface morphology of arsenopyrite, which is oxidized abiotically.
Almeida, CMVB, Giannetti, B. F.
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Arsenopyrite enrichment by column flotation
Minerals Engineering, 1993Abstract Arsenic-rich, gold-bearing pyrite concentrates may be further enriched in arsenic to assist subsequent Au beneficiation. Among several amines tested in refloating a local Chalkidiki pyrite concentrate, 2-coco 2-methyl ammonium chloride proved successful by raising the grade from 9% to 22%, although total solids recovery was low. The use of a
P. Mavros, K.A. Kydros, K.A. Matis
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Mechano-chemical oxidation of arsenopyrite
Minerals Engineering, 2019Abstract This paper presents the results from the investigation of arsenopyrite oxidation via mechano-chemical activation, using a stirred mill. Water and hydrogen peroxide were chosen as the lixiviant and oxidant, respectively, and maintained at a relatively low temperature (50 °C).
Larissa Koroznikova +5 more
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Thioarsenate formation upon dissolution of orpiment and arsenopyrite
Chemosphere, 2012Thioarsenates were previously determined as dominant species in geothermal and mineral waters with excess sulfide. Here, we used batch leaching experiments to determine their formation upon weathering or industrial leaching of the arsenic-sulfide minerals orpiment (As(2)S(3)) and arsenopyrite (FeAsS) under different pH and oxygen conditions.
Elke, Suess, Britta, Planer-Friedrich
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Flotation characteristics of arsenopyrite
2010Electrochemical 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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