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Author : Jeremy Jon Picard
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (388 download)
Download or read book The Effect of Alkalinity on the Kinetics of Pyrite Oxidation written by Jeremy Jon Picard and published by . This book was released on 1997 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : V. P. Evangelou
Publisher : CRC Press
ISBN 13 : 1351420798
Total Pages : 308 pages
Book Rating : 4.3/5 (514 download)
Download or read book Pyrite Oxidation and Its Control written by V. P. Evangelou and published by CRC Press. This book was released on 2018-04-27 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Abbas Hussain Mirza
Publisher :
ISBN 13 :
Total Pages : 548 pages
Book Rating : 4.:/5 (33 download)
Download or read book Kinetics and Mechanisms of Pyrite (FeS2) Oxidation in the Formation of Acid Mine Drainage written by Abbas Hussain Mirza and published by . This book was released on 1993 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph Diamadi
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.3/5 (121 download)
Download or read book Kinetics of Aqueous Pyrite Oxidation by Dissolved Oxygen from PH 3.8-5.2 and 10-30 0C written by Joseph Diamadi and published by . This book was released on 1989 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kwan-Yu Wong
Publisher :
ISBN 13 :
Total Pages : 266 pages
Book Rating : 4.:/5 (225 download)
Download or read book A Kinetic Study of Alkaline Hypochlorite Oxidation of Pyrite in Aqueous Suspension written by Kwan-Yu Wong and published by . This book was released on 1970 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Enhancing Effect of Pyrite on the Kinetics of Ferrous Iron Oxidation by Dissolved Oxygen written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The oxidation of ferrous in acidic sulfate media by dissolved oxygen is an important reaction in any sulfide mineral leach process that uses ferric as a surrogate oxidant. Ferric is reduced as it oxidizes metal sulfides, and the resulting ferrous is re-oxidized by dissolved oxygen. The oxidation of ferrous to ferric by dissolved oxygen is quite slow outside of elevated pressure-temperature autoclaves. However, pyrite in solution has been found to have a catalytic effect on the reaction, speeding it up significantly. This effect is particularly significant in the context of the Galvanox"!acidic sulphate atmospheric leach process. To quantify the kinetics of this reaction and the effect of pyrite, tests were run in an atmospheric batch reactor with constant tracking of pH and redox potential. The kinetics of this reaction were quantified with respect to primary variables such as acidity, pyrite pulp density, temperature, and total iron concentration. Secondary factors such as copper concentration, gas liquid mixing rate and the source of pyrite mineral were also considered. Redox potential is a logarithmic function of the ratio of the activity of free ferric to free ferrous and is complicated by speciation within the Fe(III)-Fe(II)-H2SO4-H2O system. Correlating redox potential data with extent of reaction was achieved by using permanganate redox titration and the isokinetic technique to link redox potential data directly to the fraction of ferrous reacted. This technique is effective over the potential range of interest - 360 to 510 mV vs Ag/AgCl. Under these conditions the leaching rate of pyrite is appreciable, so the rate of pyrite dissolution was predicted with the shrinking sphere model developed by Bouffard et al. Ferrous oxidation in solution was simulated with an adjusted version of the model of Dreisinger and Peters, which also accounts for the catalytic effect of dissolved copper. Oxygen solubility was predicted using the model of Tromans. Experimental data.
Author : Taylor Alexander van Hoorebeke
Publisher :
ISBN 13 : 9781369656565
Total Pages : 87 pages
Book Rating : 4.6/5 (565 download)
Download or read book Oxidation Kinetics of Pyrite in Synthetic Seawater written by Taylor Alexander van Hoorebeke and published by . This book was released on 2016 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the demand for industrial materials rises, mining companies have become increasingly interested in exploiting unconventional metal resources. Seafloor massive sulfide (SMS) deposits, one such example of an unconventional resource, will be mined for their high ore grade and abundance along oceanic plate margins. As these deposits are mined, fresh and highly reactive surfaces of sulfide minerals will be exposed to seawater, causing them to immediately oxidize. Pyrite (FeS2) is the most common sulfide mineral and readily oxidizes under atmospheric conditions. Sulfuric acid is a product of the sulfide mineral oxidation process and is often responsible for the devastating effects of acid mine drainage at terrestrial mining sites. Kinetics experiments have been conducted to determine a rate law for the abiotic rate of pyrite oxidation in synthetic seawater. Experiments run from pH 2-5, 0.995 or 0.10 atm O2, and temperatures of 285 - 303 K were used in rate law calculations. The experimentally derived molal specific rate law is: Rsp = -10-11.02±0.03[H+]0.39±0.03[PO2]0.44±0.05 where [H+] and [PO2] represent the initial molal concentrations of protons and dissolved oxygen in the seawater, and the rate Rsp is in units of moles m-2 sec-1. The initial rate method was combined with the method of isolation to determine the effects that pH, dissolved oxygen concentration, and temperature have on the pyrite oxidation rate. Results show that the initial concentration of dissolved oxygen is more influential upon the initial pyrite oxidation rate than the initial pH of the seawater under acidic, low temperature conditions. The pyrite oxidation rate in acidic seawater is the slowest of the sulfides pyrite, pyrrhotite, and chalcopyrite, with the reaction proceeding up to three orders of magnitude slower than that of pyrrhotite in synthetic seawater. The slow pyrite weathering rate (whether natural or anthropogenically induced) enhanced pyrite preservation in massive sulfide deposits. This may explain why VMS deposits are more enriched in pyrite than any other sulfide mineral.
Author : George W. Reimers
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.3/5 (243 download)
Download or read book Effect of Additives on Pyrite Oxidation written by George W. Reimers and published by . This book was released on 1990 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Samuel Peters
Publisher :
ISBN 13 : 9780494857298
Total Pages : pages
Book Rating : 4.8/5 (572 download)
Download or read book An Investigation of the Role of Sodium Carbonate and Silica in the Neutral/Alkaline Pressure Oxidation of Pyrite written by Samuel Peters and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Walter C. Lorenz
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.3/5 (91 download)
Download or read book Oxidation of Coal Mine Pyrites written by Walter C. Lorenz and published by . This book was released on 1963 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. T. Caruccio
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (24 download)
Download or read book Accelerated Pyrite Oxidation/enhanced Alkalinity Couple to Reduce Acid Mine Drainage written by F. T. Caruccio and published by . This book was released on 1991 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. T. Caruccio
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (24 download)
Download or read book Accelerated Pyrite Oxidation/enhanced Alkalinity Couple to Reduce Acid Mine Drainage written by F. T. Caruccio and published by . This book was released on 1991 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael Andersen McKibben
Publisher :
ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.:/5 (256 download)
Download or read book Kinetics of Aqueous Oxidation of Pyrite by Ferric Iron, Oxygen, and Hydrogen Peroxide from PH 1-4 and 20-40° C written by Michael Andersen McKibben and published by . This book was released on 1984 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Robert Flatt
Publisher :
ISBN 13 :
Total Pages : 428 pages
Book Rating : 4.:/5 (222 download)
Download or read book The Kinetics of Pyrite and Elemental Sulfur Reactions During Nitric Acid Pre-oxidation of Refractory Gold Ores written by James Robert Flatt and published by . This book was released on 1996 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of the thesis is to investigate the fundamental kinetics of the pyrite-nitric acid system. Particular attention is paid to the formation and oxidation of elemental sulfur. The study aims to elucidate the chemistry of the sulfide oxidation and of elemental sulfur formation and oxidation.
Author : Michael George Paschka
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (144 download)
Download or read book Kinetics of Pyrite Oxidation written by Michael George Paschka and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Americo Luis Larez
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (318 download)
Download or read book Kinetics of Pyrite Oxidation written by Americo Luis Larez and published by . This book was released on 1970 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Lynn Hunt
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (11 download)
Download or read book Solution chemistry of pyrite oxidation under mild alkaline conditions written by James Lynn Hunt and published by . This book was released on 1984 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
