pyrite mineral oxidation

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Nov 10, 2004· Pyrite is one of the most important sulfides found in the waste rock of mines. When exposed to water and oxygen, it can react to form sulfuric acid (H 2 SO 4). The following oxidation and reduction reactions express the breakdown of pyrite that leads to acid mine drainage. 1. 2FeS 2 + 7O 2 + 2H 2 O -> 2FeSO 4 + 2H 2 SO 4. 2. 2Fe 2+ + 1/2 O 2 ...

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Minerals | Free Full-Text | Effect of Initial Cell ...

Bio-oxidation of refractory sulfidic gold minerals has been applied at the commercial scale as a pre-treatment to improve gold yields and reduce chemical consumption during gold cyanidation. In this study, the effect of initial cell concentration on the oxidation of pyritic gold ore was evaluated with four aerated bioreactors at 30 °C with 10% pulp density and pH maintained at 1.4 with NaOH.

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Microbial solubilization of gangue minerals and their ...

Jun 10, 2021· Pyrite bio-oxidation can improve the gold leaching extent of refractory gold ores, but it can also cause environmental pollution. In this work, common gangue minerals (feldspar, mica, and quartz) were studied to analyze their solubilization under industrial bio-oxidation condition and their effects on pyrite bio-oxidation.

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

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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(PDF) EXPERIMENTAL STUDY OF RADIOLYTIC OXIDATION OF PYRITE …

particular, radiolysis of water coupled to oxidation of These water/pyrite mixtures were degassed and flame sulfide minerals [3] or elemental sulfur [4] can pro- sealed in quartz tubes of 2 cm diameter and 10 cm duce gradients of partially to fully oxidized sulfur spe- length.

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PYRITE OXIDATION RATES FROM HUMIDITY CELL TESTING …

Pyrite oxidation rates were calculated based on the pyrite surface area that would be exposed to gaseous and aqueous phase reactants in dissolution tests. The extent of pyrite liberation, the degree to which pyrite grains are separated from the rock matrix, was determined

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Morphology dominated rapid oxidation of framboidal pyrite ...

Feb 09, 2021· He, H. (2018) Surface structure-dependent pyrite oxidation in relatively dry and moist air: Implications for the reaction mechanism and sulfur evolution. Geochimica et Cosmochimica Acta 228, 259–274.), which may have hindered the accurate determination of the pyrite oxidation mechanism.

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The Enhancing Effect of Pyrite on the Kinetics of Ferrous ...

the enhancing effect of pyrite on the kinetics of ferrous iron oxidation by dissolved oxygen by patrick oliver leahy littlejohn b.a.sc., the university of british columbia, 2006

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The effects of trace element content on pyrite oxidation ...

Pyrite acts as both an important source and sink for many different metals and metalloids in the environment, including many that are toxic. Oxidation of pyrite can release these elements while at the same time producing significant amounts of sulfuric acid. Such issues are common in the vicinity of abandoned mines and smelters, but, as pyrite is a common accessory mineral in many different ...

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Simulation of pyrite oxidation in fresh mine tailings ...

Jul 12, 2020· The field data were compared to predictions from simulations of pyrite oxidation using a 1-D numerical model. The simulations' estimates of the amount of Fe and S released over a seven year period (52 kg and 178 kg, respectively) were in reasonably good agreement with those obtained by analysing the tailings (34 kg and 155 kg, respectively).

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Pyrite oxidation in the presence of hematite and alumina ...

Pyrite is one of the most common and geochemically important sulfide minerals in nature because of its role in the redox recycling of iron (Fe). It is also the primary cause of acid mine drainage (AMD) that is considered as a serious and widespread problem facing the mining and mineral processing in …

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Pyrite oxidation mechanism in aqueous medium - Feng - 2019 ...

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 …

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

Nov 01, 2020· 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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Pyrite disease - palaeo-electronica.org

Acidity produced by pyrite oxidation and hydrolysis immediately attacks bone apatite, and immediately destroys calcite. Examination of the reaction between bone apatite and acid is the first step towards targeted interference in this reaction. The mineral apatite serves as a geochemical proxy for bone.

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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. Some pyrites show ...

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Arsenic Pyrite Gold Extraction by Alkaline Leaching Oxidation

Jul 22, 2017· A pressure oxidation procedure that has gained commercial status for treating gold-bearing arsenopyrite or pyrite employs sulfuric acid (H2SO4) and oxygen as reagents. High temperatures (170° to 190° C) and pressures (up to 400 psig O2) are required to achieve complete oxidation of the sulfide minerals.

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Foundation Problems and Pyrite Oxidation in the ...

minerals. The Chattanooga Shale extends over a large sec-tion of the central United States, and Bryant and others (2003) documented 20 additional states that have had expansive or heaving problems in it. Some of these problems were related to pyrite oxidation and sulfate formation, and some were related to expanding clays in the shale.

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Supergene Oxidation of Copper Deposits: Zoning and ...

that pyrite quantity is critical in determining oxide zone mineralogy. Pyrite is a relatively refractory mineral in the replacement sequence; marcasite oxidizes more quickly than pyrite (Mason and Berry, 1968), and pyrrhotite oxidation is as much as two orders of magnitude faster than oxidation of pyrite (Nicholson and Scharer, 1994). Laboratory

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Pyrite oxidation by Thiobacillus ferrooxidans with special ...

Pyrite oxidation by Thiobacillus ferrooxidans with special reference to the sulphur moiety of the mineral. Arkesteyn GJ. Available cultures of Thiobacillus ferrooxidans were found to be contaminated with bacteria very similar to Thiobacillus acidophilus. The experiments described were performed with a homogeneous culture of Thiobacillus ...

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pyrite mineral oxidation - greenrevolution.org.in

Effect of temperature and illumination on pyrite oxidation between pH 2 and 6764 Кб. As pyrite oxidation is the principal cause of the formation of acidic mine drainage (AMD), there hasH. F. Steger and D. L. E., Oxidation of sulźde minerals. 4 Pyrite, chalcopyrite and pyrrhotite, Chem. Read more

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Landscape to atomic scales: Researchers apply new approach ...

Oct 29, 2020· Landscape to atomic scales: Researchers apply new approach to pyrite oxidation. Pyrite, or fool's gold, is a common mineral that reacts quickly with oxygen when exposed to …

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Bio-oxidation of pyrite, chalcopyrite and pyrrhotite by ...

bio-oxidation processes of pyrite, chalcopyrite and pyrr hotite may be linked mainly to characteristics of individual minerals and the pH in the reaction solution of the bio-oxidation system.

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Aqueous Pyrite Oxidation and the Consequent Formation of ...

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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Research on pyrite oxidation and native microorganisms has ...

Jul 16, 2020· If pyrite was present in the rock, it will oxidize. The team will examine whether this excavation and piling of materials help lead to the release of trace elements as a result of pyrite oxidation, which could have implications for the water quality of homeowners in the area.

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Experimental Study of Pyrite Oxidation at pH 6-9 and 30°C ...

Pyrite oxidation was carried out under conditions of constant pH, pt^ and temperature in a thermostadted glass reaction vessel, with a magnetic stirrer …

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(PDF) A Review on Pyrrhotite Oxidation - ResearchGate

The factors affecting pyrite and pyrrhotite oxidation are similar but the latter has received much less attention. As it is the case for pyrite, an increase in temperature has an increasing effect ...

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Leaching of Pyrite by Acidophilic Heterotrophic Iron ...

Microbiologically accelerated oxidation of pyrite (FeS 2) and other sulfidic minerals is important in both environmental and applied microbiology.Sulfide mineral dissolution by acidophilic bacteria in active and derelict mines and mine spoils produces a noxious, metal-laden, often highly acidic effluent (acid mine drainage [AMD]), which is a serious and widespread form of stream and river ...

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Chemistry:Pyrite - HandWiki

Jul 26, 2021· Formal oxidation states for pyrite, marcasite, and arsenopyrite. From the perspective of classical inorganic chemistry, which assigns formal oxidation states to each atom, pyrite is probably best described as Fe 2+ S 2 2−. This formalism recognizes that the sulfur atoms in pyrite occur in pairs with clear S–S bonds.

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