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Basic AMD Chemistry - Lehigh University

The fourth reaction is the oxidation of additional pyrite by ferric iron. The ferric iron is generated in the reactions described above. This is the cyclic and self propagating part of the overall reaction and takes place very rapidly and continues until either ferric iron or pyrite is depleted.

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Mechanism of Oxidation of Pyrite, Chalcopyrite and Bornite ...

Jul 18, 2013 · Mechanisms have been proposed for pyrite, chalcopyrite and bornite oxidation in flash smelting, on the basis of results obtained. The adequacy of mechanisms proposed was tested by investigating the shaft product taken from the flash smelting furnace (Pirdop, Bulgaria) obtained when sulphide copper blend was smelted to a matte containing 55% of Cu.

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

In spite of many decades of research, the key controls of mechanisms and hence rates of the oxidation of pyrite remain poorly understood. This is largely because the processes of aqueous oxidation, which are relevant here, involve a complex series of elementary reactions.

MECHANISMS OF PYRITE OXIDATION TO NON-SLAGGING .

rate-limiting mechanisms of pyrite oxidation is required. The overall objectives of this project were to characterize the various mechanisms that control overall pyrite combustion rates and to synthesize the mechanisms into a pyrite combustion model. These objectives were achieved. The model produced has the capability of being incorporated into

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A review of the properties of pyrite and the implications ...

The oxidation of pyrite leads to the phenomenon of acid rock drainage which can have significant environmental impacts (Vaughan 2005). Pyrite is also the principal source of inorganic sulphur in coal (Zhao et al. 2005), the combustion of which results in air pollution and associated environmental effects.

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Mechanism of Bacterial Pyrite Oxidation

It is probable that two mechanisms of bacterial pyrite oxidation operate concurrently: the direct contact mechanism which requires physical contact between bacteria and pyrite particles for biological pyrite oxidation, and the indirect contact mechanism according to which the bacteria oxidize ferrous ions to the ferric state, thereby ...

Evaluation of factors affecting pyrite oxidation and ...

PHOENICS. The pyrite oxidation rate is described by a shrinking-core model for spherical pyritic grains. Oxygen transport within the backfill material is assumed to be by diffusion. A sensitivity analysis of the major parameters that influence the rate of the pyrite oxidation and subsequent pollutant generation has been carried out.

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THE EFFECT OF OXYGEN ON PYRITE - WordPress

THE EFFECT OF OXYGEN ON PYRITE OXIDATION 1 By Richard W. Hammack George R. Watzlaf 2 Abstract. The oxygen dependence of abiotic and biotic pyrite oxidation was examined on three scales: 1) pyrite surfaces to a depth of 20 angstroms, 2) 5 g quantities of pyrite in small columns, and 3) 175 kg quantities of pyritic shale in large columns.

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Pyrite Oxidation Kinetics - How Fast does Pyrite Oxidize

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 in supergene alteration of ore deposits, the formation of acid sulfate soils, etc. Pyrite oxidation is generally recognized as a complicated process ...

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Acid mine drainage - Wikipedia

The chemistry of oxidation of pyrites, the production of ferrous ions and subsequently ferric ions, is very complex, and this complexity has considerably inhibited the design of effective treatment options. Although a host of chemical processes contribute to acid mine drainage, pyrite oxidation is by far the greatest contributor.

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Basic AMD Chemistry - Lehigh University

The fourth reaction is the oxidation of additional pyrite by ferric iron. The ferric iron is generated in the reactions described above. This is the cyclic and self propagating part of the overall reaction and takes place very rapidly and continues until either ferric iron or pyrite is depleted.

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Pyrite Oxidation and Its Control (Amd, Molecular Oxidation ...

Pyrite Oxidation and Its Control (Amd, Molecular Oxidation Mechanisms, Microbial Role, K) [V. P. Evangelou] on Amazon. *FREE* shipping on qualifying offers. Pyrite Oxidation and its Control is the single available text on the market that presents the latest findings on pyrite oxidation and acid mine drainage (AMD). This new information is an indispensable reference for generating new ...

Mechanisms of Pyrite Oxidation to Non-Slagging Species

pyrite oxidation for various particle size classes and particle temperatures: particle size distribution, porosity, pore size distribution, total surface area, morphology, and composition of reacted pyrite. An expression for the reaction rate resistance introduced by intraparticle mass transfer during pyrite oxidation.

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MECHANISMS OF PYRITE OXIDATION TO NON-SLAGGING .

rate-limiting mechanisms of pyrite oxidation is required. The overall objectives of this project were to characterize the various mechanisms that control overall pyrite combustion rates and to synthesize the mechanisms into a pyrite combustion model. These objectives were achieved. The model produced has the capability of being incorporated into

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Pyrite Chemistry: The Key for Abatement of Acid Mine ...

Pyrite oxidation produces extremely acidic drainages (as low as pH 2) enriched with Fe, Mn, Al, SO 4, and often heavy metals such as Pb, Hg, Cd, etc. (Table 10.1). Pyrite oxidation takes place when the mineral is exposed to air and water.

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PYRITE OXIDATION and ITS CONTROL - GBV

MOLECULAR CHEMISTRY OF PYRITE OXIDATION KINETICS AND PYRITE REDOX CHEMISTRY CHAPTER 6 MECHANISMS AND KINETICS OF PYRITE OXIDATION 137 6.1 Structural Chemistry 137 6.2 Reaction Progress Variables (RPV) 138 6.3 Reaction Mechanisms 139 6.3.1 Other mechanisms of pyrite oxidation 144 6.3.2 Electrochemical mechanisms of pyrite oxidation 147

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Sulfide To Sulfate Reaction Mechanism - EPA

----- Sulfide to Sulfate Reaction Mechanism A Study of the Sulfide to Sulfate Reaction Mechanism as it Relates to the Formation of Acid Mine Waters Ohio State University Research Foundation Columbus,Ohio 43210 for the FEDERAL WATER POLLUTION CONTROL ADMINISTRATION DEPARTMENT OF THE INTERIOR Program Number FWPCA Grant No. 14.010 FPS February 1970 .

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Pyrite oxidation mechanism in aqueous medium ... - Wiley

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 .

    Author: Jiling Feng, Hua Tian, Yaling Huang, Zhiying Ding, Zhoulan YinGet Price

Journal of Environmental Quality Abstract - Mechanism of ...

Journal of Environmental Quality Abstract - Mechanism of Pyrite Oxidation in Aqueous Mixtures ... The rate of pyrite oxidation in aqueous mixtures was studied at 25 °C for periods up to 3 wk. Dissolved plus citrate-dithionite-extractable Fe was used to measure the extent of reaction. ... Pyrite oxidation mechanisms and acid mine drainage ...

  • Published in: Journal of Environmental Quality · 1989Authors: A D Brown · J J JurinakAffiliation: University of California RiversideAbout: Alkali metal · Chemical reaction · Aqueous solution · Alkaline earth metal · Electron tra.[PDF]Get Price

The interaction of pyrite {100} surfaces with O and H O ...

as reactants in the overall oxidation process and any mecha-The interaction of pyrite {100} surfaces with O2 and H2O: Fundamental oxidation mechanisms KEVIN M. ROSSO,1,* UDO BECKER,2 AND MICHAEL F. HOCHELLA JR.1 1Department of Geological Sciences, ia Polytechnic Institute and State University, Blacksburg, ia 24061, U.S.A.

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Mechanism of Sulfur Oxidation in Pyrite - 911metallurgist

Mechanism of Sulfur Oxidation in Pyrite View Larger Image The Mechanism of Sulfur Oxidation in Pyrite is base on what is generally believed as anodic oxidation of pyrite occurs according to the reactions to form S° and SO4=.

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