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pyrite mineral oxidation -

pyrite mineral oxidation -

PYRITE OXIDATION and ITS CONTROL - gbv.de

2007-12-11 · 6.4 Pyrite Surface Functional Groups 148 6.4.1 Pyrite oxidation effects by iron-carbonate complexes. 156 6.5 Kinetics of Pyrite Oxidation 159 6.5.1 Empirical pyrite oxidation rate laws 161 6.5.2 Application of pyrite oxidation kinetics 164 6.5.3 Shrinking core model kinetics 168 6.6 Effect of Anions on Oxidation of Fe2+ 170 CHAPTER 7

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OXIDATION OF SULFIDE MINERALS, 4. PYRITE,

2010-10-12 · OXIDATION OF SULFIDE MINERALS, 4. PYRITE, CHALCOPYRITE AND PYRRHOTITE* GL03704 H.F. STEGER and L.E. DESJARDINS Special Projects Section, Canada Centre for Mineral and Energy Technology (CANMET), Ottawa, KIA GGI (Canada) Chemical Laboratory, Canada Centre for Mineral and Energy Technology (CANMET), Ottawa,

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Evolution of pyrite oxidation from a 10-year kinetic leach ...

The sulfide oxidation cell test was used to evaluate pyrite oxidation rates in the KLC mineral composite via the sample O 2 consumption rate (Smart et al., 2002). In brief, this method involves an airtight chamber where the volume of air, after placing a column in the chamber, is known.

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The mechanisms of pyrite oxidation and leaching: A ...

2010-9-1 · Abstract. Pyrite is the earth’s most abundant sulfide mineral. Its frequent undesirable association with minerals of economic value such as sphalerite, chalcopyrite and galena, and precious metals such as gold necessitates costly separation processes such as leaching and flotation. Additionally pyrite oxidation is a major contributor to the ...

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Pyrite Oxidation Kinetics - How Fast does Pyrite Oxidize

2018-2-19 · Pyrite oxidation has been studied extensively, in the past, because of its importance in sulfide mineral separations by flotation, in the generation of

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Oxidation of pyrite (FeS2) and troilite (FeS) impurities ...

2021-12-24 · The different intermediate transformations on heating for pyrite and troilite lead to significant differences in the loss on ignition (LOI) values for each mineral at reaching 850 °C. In the case of pyrite, the final weight of the sample is about 70% of the initial mass, while in the case of troilite the final weight of the sample is 97% of ...

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Pyrite thermal decomposition in source rocks - ScienceDirect

2021-3-1 · The reactions of the decomposition of the most common sulphide mineral, pyrite, are the combination of oxidation, disproportion and thermal dissociation. These reactions overlap each other partly or completely . The comprehensive and detailed description of the reactions under the influence of temperature in various atmospheres is given by this ...

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Electrochemical investigation of the oxidation of pyrite ...

2021-10-10 · 1. Introduction. Pyrite is an extremely reactive and abundant sulfide mineral in the lithosphere , and its oxidation regulates many biogeochemical processes related to common redox-active elements: sulfur, oxygen, carbon, and iron [6,36].Except for the importance of pyrite weathering to our understanding of Earth's history , it is particularly important to many

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(PDF) Microbial oxidation of pyrite: Experiments using ...

Pyrite incubated in the microcosms became significantly weathered, with extensive pit formation across the mineral surface that is consistent with microbial iron

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(PDF) Review on the Bio-oxidation of Pyrite: Implications ...

2022-1-10 · Pyrite (FeS2) Review the most abundant and widely spread Iron-containing sulfide mineral in the earth, and it is also an important source of sulfuric acid (H2SO4) and is commonly associated with ...

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Pyrite oxidation reactions | Download Table

Iron oxidation is considered as the ratelimiting step in the dissolution of pyrite, which is the most abundant sulfide mineral found in rocks (Schrenk et al., 1998; Edwards et al., 1999); the ...

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Oxidation of pyrite (FeS2) and troilite (FeS) impurities ...

2021-12-24 · The different intermediate transformations on heating for pyrite and troilite lead to significant differences in the loss on ignition (LOI) values for each mineral at reaching 850 °C. In the case of pyrite, the final weight of the sample is about 70% of the initial mass, while in the case of troilite the final weight of the sample is 97% of ...

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PYRITE OXIDATION and ITS CONTROL - gbv.de

2007-12-11 · 6.4 Pyrite Surface Functional Groups 148 6.4.1 Pyrite oxidation effects by iron-carbonate complexes. 156 6.5 Kinetics of Pyrite Oxidation 159 6.5.1 Empirical pyrite oxidation rate laws 161 6.5.2 Application of pyrite oxidation kinetics 164 6.5.3 Shrinking core model kinetics 168 6.6 Effect of Anions on Oxidation of Fe2+ 170 CHAPTER 7

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Anaerobic pyrite oxidation in a naturally occurring pyrite ...

2019-3-13 · Pyrite undergoes oxidation when exposed to aqueous oxygen to produce acidic leachate with high concentrations of H+, SO42−, and Fe3+. The oxidation mechanism is currently ascribed to contact between the mineral and aqueous oxygen. Consequently, management of acidic leachate from acid sulfate soils and acid mine drainage is focused on the prevention of

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Microbial acceleration of aerobic pyrite oxidation at ...

2021-6-14 · Rates of pyrite oxidation, changes to 84 pyrite framboids, cell-mineral associations, and composition of microbial communities were 85 monitored during oxidation. A metagenomic analysis of organisms in the cultures was conducted 86 to gain insight into potential mechanisms of microbially-accelerated pyrite oxidation. Our results

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OXIDATION OF SULFIDE MINERALS, 4. PYRITE,

2010-10-12 · OXIDATION OF SULFIDE MINERALS, 4. PYRITE, CHALCOPYRITE AND PYRRHOTITE* GL03704 H.F. STEGER and L.E. DESJARDINS Special Projects Section, Canada Centre for Mineral and Energy Technology (CANMET), Ottawa, KIA GGI (Canada) Chemical Laboratory, Canada Centre for Mineral and Energy Technology (CANMET), Ottawa,

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The causes behind pyrite oxidation - and acid mine ...

2020-11-1 · Pyrite oxidation, which can lead to acid mine drainage, is a concern for miners all across the globe. However, little is known about the processes that cause this phenomenon.

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Morphology dominated rapid oxidation of framboidal

2021-2-9 · Morphology dominated rapid oxidation of framboidal pyrite. R. Du1,2,3, 1 CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guangzhou 510640, China. 2 CAS Center for Excellence in Deep Earth Science ...

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Kinetics of pyrite oxidation | SpringerLink

The properties of surface films on pyrite have been studied through electrochemical techniques of cyclic voltammetry and AC impedance measurements. The characteristics of the surface films depend on the conditions of oxidation and the source of pyrite. At potentials near 0.0 V, some pyrites have large values of polarization resistance, showing a certain degree of passivity.

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Technical Note Pyrite oxidation by hydrogen peroxide in ...

2015-12-27 · The European Journal of Mineral Processing and Environmental Protection Vol.4, No.3, 1303-0868, 2004, pp. 203-209 Technical Note Pyrite oxidation by hydrogen peroxide in phosphoric acid solutions P. Chirita* Department of Inorganic and Analytical Chemistry, University of Craiova, 1100, Craiova, Romania ...

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(PDF) Review on the Bio-oxidation of Pyrite: Implications ...

2022-1-10 · Pyrite (FeS2) Review the most abundant and widely spread Iron-containing sulfide mineral in the earth, and it is also an important source of sulfuric acid (H2SO4) and is commonly associated with ...

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Pyrite oxidation mechanism in aqueous medium - Feng -

2019-1-31 · The mineral pyrite is considered the most common form of the sulfide minerals. Its oxidation is a very important process in nature, which involves in the redox recycling of iron. However, because of the growing need for the industrial production, sulfide oxidation produces more and more acid mine (or rock) drainage.

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Questa – DRA-31 Pyrite Oxidation and Acid Neutralization

2018-8-10 · pyrite-bearing, hydrothermally-altered igneous rocks near Questa, and how are these relevant to evaluation of mineral stabilities that could affect friction angle or cohesion? Objectives of the study include: • Developing simple simulations of pyrite oxidation under closed- and open-system oxygen flux.

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Aqueous Pyrite Oxidation and the Consequent Formation

The oxidation of pyrite in aqueous systems is a complex biogeochemical process involving several redox reactions and microbial catalysis. This paper reviews the kinetic data on pyrite oxidation, compares available data on the inorganic vs. microbial oxidative mechanisms and describes the occurrence of mineral products resulting from pyrite oxidation.

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Microbial acceleration of aerobic pyrite oxidation at ...

2021-6-14 · Rates of pyrite oxidation, changes to 84 pyrite framboids, cell-mineral associations, and composition of microbial communities were 85 monitored during oxidation. A metagenomic analysis of organisms in the cultures was conducted 86 to gain insight into potential mechanisms of microbially-accelerated pyrite oxidation. Our results

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High redox potential promotes oxidation of pyrite under ...

2021-4-19 · This study explored the performance of PAD in the presence of EDTA and revealed the mechanism of anaerobic pyrite oxidation and microbial mineral transformation. It was demonstrated that ~200 mV was the electrochemical threshold for converting pyrite into bioavailable forms in PAD conditions, and accelerated pyrite oxidation by Fe 3+ -EDTA

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Oxidative Hydrometallurgy of Sulphide Minerals

2018-9-25 · oxidation of pyrite, one of the most abundant minerals on earth. In general, under oxidant condition and low pH, pyrite oxidation proceeds through two basic steps: In the first step, the dissolution of pyrite to ferrous ions in an acid medium proceeds through the formation of an iron-deficient or a sulfur-rich layer rather than elemental sulfur.

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Oxidation state of gold and arsenic in gold-bearing ...

2001-5-17 · Oxidation state of gold and arsenic in gold-bearing arsenian pyrite GRIGORE SIMON,1,* HUI HUANG,2 JAMES E. PENNER-HAHN,2 STEPHEN E. KESLER,1,† AND LI-SHUN KAO1 1Department of Geological Sciences, University of Michigan, 2534 C.C. Little Building, Ann Arbor, Michigan 48109, U.S.A.

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(PDF) Sulfide Mineral Oxidation - researchgate.net

Sulfide-mineral oxidation is a complex hydrobiogeo-. chemical process involving the oxidation of metal-. sulfide minerals, catalyzed by numerous bacterial and. archaeal microbial specie s, and ...

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Basic Iron Sulphate in Pressure Oxidation Processing

of iron sulphide minerals such as pyrite, pyrrhotite and arsenopyrite. To recover the gold, the host mineral must generally be broken down chemically, by oxidative processes such as roasting, pressure oxidation or bacterial leaching, which expose the gold for subsequent recovery by leaching in cyanide solution. The focus of attention in

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