pyrite mineral oxidation

Pyrite oxidation: a state-of-the-art assessment of the ...

2003-3-1  The oxidation of pyrite to release ferrous iron and sulfate ions to solution involves the transfer of seven electrons from each sulfur atom in the mineral to an aqueous oxidant. Because only one or, at most, two electrons can be transferred at a time, the overall oxidation process is

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Oxidation of Pyrite - Acid Mine Drainage:From Waste to ...

2021-12-7  The pyrite oxidation and the factors affecting the kinetics of oxidation (0 2, Fe 3+, temperature, pH, E h, and the presence or absence of microorganisms) have been the focus of extensive study because of their importance in both environmental remediation and mineral separation (Blowes et al., 2003).

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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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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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Microbial acceleration of aerobic pyrite oxidation at ...

Pyrite (FeS 2) is the most abundant sulfide mineral on Earth and represents a significant reservoir of reduced iron and sulfur both today and in the geologic past.In modern environments, oxidative transformations of pyrite and other metal sulfides play a key role in terrestrial element partitioning with broad impacts to contaminant mobility and the formation of acid mine drainage systems.

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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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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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Oxidation of Pyrite - Acid Mine Drainage:From Waste to ...

2021-12-7  The pyrite oxidation and the factors affecting the kinetics of oxidation (0 2, Fe 3+, temperature, pH, E h, and the presence or absence of microorganisms) have been the focus of extensive study because of their importance in both environmental remediation and mineral separation (Blowes et al., 2003).

More

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 acid in mine waters and in leaching of pyrite. The oxidation of pyrite also plays key role

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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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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.

More

Microbial acceleration of aerobic pyrite oxidation at ...

Pyrite (FeS 2) is the most abundant sulfide mineral on Earth and represents a significant reservoir of reduced iron and sulfur both today and in the geologic past.In modern environments, oxidative transformations of pyrite and other metal sulfides play a key role in terrestrial element partitioning with broad impacts to contaminant mobility and the formation of acid mine drainage systems.

More

PYRITE OXIDATION and ITS CONTROL - gbv

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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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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Minerals Free Full-Text Directional Oxidation of ...

2018-12-22  This study aimed to investigate the oxidation mechanism of pyrite crystallographic direction by cutting pyrite samples to expose their (100), (110), and (111) planes. Differences in the oxidation rates of pyrite planes in acid solution

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The effect of adsorbed lipid on pyrite oxidation under ...

2006-7-25  The subsequent oxidation of the mineral by the aqueous Fe 3+ is referred to as the "indirect" mechanism of pyrite oxidation . This mechanism is in contrast to the "direct" mechanism, that involves the oxidation of the pyrite by surface colonized bacteria (either by enzymatic or non-enzymatic means) [ 8 , 20 ].

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Minerals Free Full-Text Experimental Study of Pyrite ...

2019-7-12  The oxidation of pyrite is one of the near field processes of the chemical evolution of clay rock planned to host a deep geological radioactive waste repository during operation. Indeed, this process can lead to transitory acidic conditions in the medium (i.e., production of sulphuric acid, carbonic acid) which may influence the corrosion kinetics of the carbon steel components

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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.

More

PYRITE OXIDATION and ITS CONTROL - gbv

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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Minerals Free Full-Text Directional Oxidation of ...

2018-12-22  This study aimed to investigate the oxidation mechanism of pyrite crystallographic direction by cutting pyrite samples to expose their (100), (110), and (111) planes. Differences in the oxidation rates of pyrite planes in acid solution

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Pyrite oxidation in sediment samples from the German

2001-6-12  The change in mineral phases with increasing oxidation status of the sediments also changed the activities of Al, Fe, and SO 4 in solution phases. The results obtained in this study suggested the usefulness of predictive models to estimate sediment and water acidification due to pyrite oxidation.

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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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The effect of adsorbed lipid on pyrite oxidation under ...

2006-7-25  The subsequent oxidation of the mineral by the aqueous Fe 3+ is referred to as the "indirect" mechanism of pyrite oxidation . This mechanism is in contrast to the "direct" mechanism, that involves the oxidation of the pyrite by surface colonized bacteria (either by enzymatic or non-enzymatic means) [ 8 , 20 ].

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Deep abiotic weathering of pyrite

2020-10-23  Pyrite, also called fool's gold, is an iron sulfide mineral that is very commonly found in rock but is almost nonexistent in sediments today. Pyrite oxidizes quickly and is a major source of sulfur to the ocean, but it is also a proxy for the oxygen content historically in

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Effect of temperature and illumination on pyrite oxidation ...

2000-7-4  Pyrite oxidation is an important process in the geochemical cycles of iron and sulfur.[1, 2] In aerobic near-surface aqueous environments, pyrite is thermodynamically unstable and oxidizes.In most aqueous environments, the oxidant for the reaction is either dissolved molecular oxygen [reaction (1)] or dissolved ferric iron [reaction (2)].

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Triple oxygen isotope insight into terrestrial pyrite ...

2020-4-7  Pyrite oxidation proceeds via one-electron transfer steps occurring at anode sites on the mineral surface and thus involves oxygen-bearing sulfur intermediate species (S 2 O 2 2 −, S 3 O 6 2 −, and SO 3 2 −) .

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Reductive dissolution of pyrite by methanogenic archaea ...

2021-6-10  Pyrite (FeS 2) is the most abundant sulfide mineral in Earth’s crust and its formation and fate are key controls on the biogeochemical cycles

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