Pyrite Oxidation And Its Control
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Pyrite Oxidation And Its Control
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Author : V. P. Evangelou
language : en
Publisher: CRC Press
Release Date : 2018-04-27
Pyrite Oxidation And Its Control written by V. P. Evangelou and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-27 with Science categories.
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 concepts and technologies for controlling pyrite oxidation. This book focuses on pyrite oxidation theory, experimental findings on oxidation mechanisms, as well as applications and limitations of amelioration technologies. The text also includes discussions on the theory and potential application of novel pyrite microencapsulation technologies for controlling pyrite oxidation currently under investigation in the author's laboratory.
Pyrite Oxidation And Its Control
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Author : V. P. Evangelou
language : en
Publisher: CRC Press
Release Date : 2018-04-27
Pyrite Oxidation And Its Control written by V. P. Evangelou and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-27 with Science categories.
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 concepts and technologies for controlling pyrite oxidation. This book focuses on pyrite oxidation theory, experimental findings on oxidation mechanisms, as well as applications and limitations of amelioration technologies. The text also includes discussions on the theory and potential application of novel pyrite microencapsulation technologies for controlling pyrite oxidation currently under investigation in the author's laboratory.
Practical Considerations Of Pyrite Oxidation Control In Uranium Tailings A Report For The National Uranium Tailings Program
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Author : K. D. Hester
language : en
Publisher:
Release Date : 1984
Practical Considerations Of Pyrite Oxidation Control In Uranium Tailings A Report For The National Uranium Tailings Program written by K. D. Hester and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
A Silica Fly Ash Based Technology For Controlling Pyrite Oxidation Semi Annual March 1 1996 August 31 1996
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Author :
language : en
Publisher:
Release Date : 2001
A Silica Fly Ash Based Technology For Controlling Pyrite Oxidation Semi Annual March 1 1996 August 31 1996 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The overall objective is to develop methodologies by which metasilicate or fly ash may produce an effective coating on pyrite surfaces for inhibiting pyrite oxidation. During the past six months, the investigators produced wet chemistry evidence demonstrating that pyrite-HCO[sub 3] complexes promote pyrite oxidation. This is an important finding for their over all strategy in controlling pyrite oxidation because it suggests that pyrite microencapsulation is important in order to control oxidation in near cirumneutral pH environments produced by addition of alkaline material, e.g., fly ash. In their previous studies, the investigators reported that pyrite microencapsulation could be carried out by reacting pyrite with a pH buffered solution and in the presence of metasilicate. The coating formed on the surface of pyrite appeared to be an amorphous iron-oxide-silicate material which inhibited pyrite oxidation. During this past six months, the investigators evaluated: the molecular mechanisms of silicate adsorption by iron oxide; the effects of silicate on the bulk and surface properties of iron oxides; and the effect of silicate on metal-cation adsorption properties by iron oxides.
Implications Of Pyrite Oxidation For Engineering Works
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Author : A. Brian Hawkins
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-07-30
Implications Of Pyrite Oxidation For Engineering Works written by A. Brian Hawkins and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-07-30 with Science categories.
The book highlights and analyses the distress to buildings caused by sulphate-induced heave, with particular reference to the recent problems in the Dublin area of Ireland. It describes the formation of pyrite, the processes involved in its oxidation and the various ways in which consequential expansion takes place. For the first time in the literature it discusses the way that buildings can be raised above their supporting foundation walls by the expansion of pyritiferous fill which has been used beneath ground-bearing floor slabs in Ireland. The significance of fractures through the iron sulphide microcrystals for the rate and extent of oxidation is discussed. Photographs and profiles of sulphate ingress into concrete/concrete blocks are presented. Case histories from the UK, North America and Ireland are discussed.
The Rich Photographic Legacy Of Edward Curtis
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Author :
language : en
Publisher:
Release Date : 1972
The Rich Photographic Legacy Of Edward Curtis written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.
The Study Of Kinetic Controls On Pyrite Oxidation With Application To Abandonment Of Pyritic Uranium Tailings
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Author : J. A. Cherry
language : en
Publisher:
Release Date : 1984
The Study Of Kinetic Controls On Pyrite Oxidation With Application To Abandonment Of Pyritic Uranium Tailings written by J. A. Cherry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
A laboratory investigation was undertaken to further clarify thecontrols on pyrite oxidation in carbonate-buffered solution. Thebehaviour of oxidation rates over extended periods of time andreaction progress was examined. The effects of variation inlocalized moisture content in the presence of unlimited oxygen inthe gas filled pores was also studied. Flow through systems wereused in which granular pyrite or silica sand and pyrite mixtureswere maintained under partially-saturated moisture conditions. Gas with atmospheric levels of oxygen was also passedcontinuously through the samples.
Control Of Pyrite Surface Chemistry In Physical Coal Cleaning
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Author :
language : en
Publisher:
Release Date : 1992
Control Of Pyrite Surface Chemistry In Physical Coal Cleaning written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Over the past 10 years, much research has provided convincing evidence that one major difficulty in using froth flotation to separate pyrite from coal is the self-induced'' flotation of pyrite. Numerous studies have attempted to identify reactions that occur under moderate oxidizing conditions, which lead to self-induced flotation, and to identify the oxidization products. During the past two report periods, it was established that: (1) freshly fractured pyrite surfaces immediately assume, at fracture, an electrode potential several hundred millivolts more negative than the usual steady state mixed potentials. Within minutes after fracture, the electrodes oxidize and reach higher steady state potentials. It was also shown, by photocurrent measurements, that a negative surface charge (upward band bending) already exists on freshly fractured pyrite, and (2) particle bed electrodes can be used to control the oxidation of pyrite and to precisely determine the electrochemical conditions where flotation occurs, or is depressed. By circulating the solution phase to an ultraviolet spectrometer, soluble products produced on pyrite by oxidation and reduction can be determined, e.g., HS[sup [minus]] was identified as a soluble cathodic reduction product. These and other studies have provided considerable information concerning the anodic oxidation of pyrite. Much less is known about the mechanism and kinetics of oxygen reduction, the other half of the mixed potential reaction. To better understand pyrite oxidation kinetics and determine if oxygen reduction is rate determining, studies have been conducted during this report period on the oxygen reduction reaction with pyrite. In addition, to provide further support that the potential of particle bed electrodes can be controlled, the electro-adsorption and desorption of an organic surfactant was studied.
Control Of Eh And Ph To Evaluate The Rate Of Pyrite Oxidation
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Author : Kevin John Breen
language : en
Publisher:
Release Date : 1982
Control Of Eh And Ph To Evaluate The Rate Of Pyrite Oxidation written by Kevin John Breen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Controlling Incipient Oxidation Of Pyrite For Improved Rejection Technical Progress Report For The Ninth Quarter October 1 December 31 1994
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Author :
language : en
Publisher:
Release Date : 2001
Controlling Incipient Oxidation Of Pyrite For Improved Rejection Technical Progress Report For The Ninth Quarter October 1 December 31 1994 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The major objectives of this work are (1) to determine the Eh-pH conditions under which pyrite is stable, (2) to determine the mechanism of the initial stages of pyrite oxidation, and (3) to determine if the semi-conducting properties of pyrite effects its oxidation behavior. It is known that moderate oxidation of pyrite produces a hydrophobic surface product. This hydrophobic product makes it extremely difficult to depress pyrite in coal flotation circuits. The eventual objective of this work is to prevent pyrite oxidation in order to better depress pyrite in coal flotation circuits. It has been shown that by holding the potential of pyrite at its stable potential during fracture, pyrite undergoes neither oxidation nor reduction. It has also been found that fresh pyrite surfaces created by fracture in an electrochemical begin to oxidize at potentials that are about 200 mV more negative than the potentials reported in the literature for pyrite oxidation. This report period, electrochemical impedance spectroscopy (EIS) studies were continued. As discussed in the seventh quarterly progress report, the impedance of pyrite does not show the characteristics expected for either semi-conducting or metallic electrodes. Additional studies were conducted to confirm the anomalous impedance behavior. For this purpose, freshly fractured surfaces were progressively polished on 600 and 1,200 grit silicon carbide paper, and with 0.3[micro][alpha]-alumina and 0.05[micro][gamma]-alumina micropolish. Polishing is known to introduce defects in the lattice structure of semi-conducting electrodes and it was anticipated that the defects would effect the interfacial capacitance.