Results 171 to 180 of about 3,405 (219)

Surface oxidation modification mechanism of sodium persulfate on arsenopyrite and its impact on the flotation separation of bornite and arsenopyrite

Journal of Hazardous Materials
Bornite and arsenopyrite are common sulfide minerals in copper ores. The similar physicochemical properties of these minerals pose challenges for their effective separation through traditional flotation methods. This study systematically investigated the impact of sodium persulfate (Na2S2O8) treatment on the flotation performance of both bornite and ...
Kang Feng, Dandan Wu
exaly   +3 more sources

Oxidation of arsenopyrite (FeAsS) in acid Part I: Reactivity of arsenopyrite

Journal of Applied Electrochemistry, 1996
The oxidation reactivity of arsenopyrite FeAsS in dilute acid determines the recovery of gold from arsenopyritic gold ores by slurry electrolysis. Stoichiometric,sulfur- and arsenic- deficient arsenopyrite have practically the same oxidation rate. Arsenopyrite is covered with a metal deficient sulfide layer which appears to determine the restpotential ...
P. G. Fernandez, H. G. Linge, M. W. Wadsley   +2 more
openaire   +1 more source

Thermodynamics of roasting arsenopyrite

Metallurgical Transactions B, 1983
Existing thermodynamic data for the Fe-As-S-0 system were evaluted and predominance area diagrams for that system were constructed at 798 and 973 K. Isopleths for the As/S and As/O atomic ratios in the vapor phase have been added to the diagrams by solving the complex equilibria.
N. Chakraborti, D. C. Lynch
openaire   +1 more source

The use of dithiophosphates and dithiocarbamates for the flotation of arsenopyrite

Minerals Engineering, 1990
The 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., Bradshaw, D. J., Upton, A. E.   +2 more
openaire   +4 more sources

Electrolytic oxidation of arsenopyrite slurries

Minerals Engineering, 1993
Abstract 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
openaire   +1 more source

Arsenopyrite: a spectroscopic investigation of altered surfaces

Mineralogical Magazine, 1989
AbstractSurfaces 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.
openaire   +1 more source

Arsenopyrite enrichment by column flotation

Minerals Engineering, 1993
Abstract 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
openaire   +1 more source

Thioarsenate formation upon dissolution of orpiment and arsenopyrite

Chemosphere, 2012
Thioarsenates 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
openaire   +2 more sources

Flotation characteristics of arsenopyrite

2010
Electrochemical 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 ...
openaire   +1 more source

Bacterial oxidation of arsenopyrite and enargite

Economic Geology, 1964
In 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 ...
openaire   +1 more source