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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 : 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 : 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:
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 : V. P. Evangelou
Publisher : CRC Press
ISBN 13 : 9780849347320
Total Pages : 308 pages
Book Rating : 4.3/5 (473 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 1995-05-04 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 : 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 : Alvaro Francisco Umaña
Publisher :
ISBN 13 :
Total Pages : 480 pages
Book Rating : 4.:/5 (386 download)
Download or read book Kinetics of Oxidative Dissolution of Pyrite by Aqueous Chlorine Species written by Alvaro Francisco Umaña and published by . This book was released on 1979 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Geoffrey S. Plumlee
Publisher :
ISBN 13 :
Total Pages : 632 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Environmental Geochemistry of Mineral Deposits written by Geoffrey S. Plumlee and published by . This book was released on 1999 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 434 pages
Book Rating : 4.3/5 (91 download)
Download or read book Geochemistry International written by and published by . This book was released on 2000 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1964-v. 2, no. 1, 1965 include selected articles translated from geochemical papers from other languages, but primarily from Russian, German, French, and Japanese.
Author : Werner Stumm
Publisher : Wiley-Interscience
ISBN 13 :
Total Pages : 568 pages
Book Rating : 4.:/5 (318 download)
Download or read book Aquatic Chemical Kinetics written by Werner Stumm and published by Wiley-Interscience. This book was released on 1990-08-09 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aquatic Chemistry An Introduction Emphasizing Chemical Equilibria in Natural Waters Second Edition Edited by Werner Stumm and James J. Morgan This second edition of the renowned classic unites concepts, applications, and techniques with the growing amounts of data in the field. Expanded treatment is offered on steady-state and dynamic models employing mass-balance approaches and kinetic information. New chapters address such topics as: environmental aspects of aquatic chemistry; new material on organic compounds in natural water systems; the use of stable and radioactive isotopes in chemical and physical processes; the latest advances in marine chemistry; solid-solution interface; kinetic considerations of equilibria; metal-ligand interactions; and an expanded compilation of thermodynamic data for important reactions in natural water systems. 1981 (0 471-04831-3) Cloth 780 pp. (0 471-09173-1) Paper Chemical Processes in Lakes Edited by Werner Stumm This is a multidisciplinary analysis of recent research on the physical, chemical, and biological processes in aquatic systems. Coverage includes: distribution of elements and compounds in water and sediments; sedimentation and sediment accumulation of nutrients and pollutants; eurtophication and acidification; atmospheric deposition; redox-related geochemistry and sediment-water exchange of nutrients and metals; sediment dating and paleolimnology; and steady-state and dynamic models. Most chapters focus on the role of biological processes and the coupling of elemental cycles by organisms. 1985 (0 471-88261-5) 435 pp. Principles of Aquatic Chemistry Francois M. M. Morel Here is a quantitative treatment of the chemical principles that govern the composition of natural waters. Features include an in-depth examination of the use of conservation principles in chemical systems, a review of thermodynamic and kinetic principles applicable to aquatic systems, and a novel presentation of a systematic methodology for equilibrium calculations. Detailed coverage is provided on the topic of aquatic chemistry, following the traditional divisions of acid-base, precipitation-dissolution, coordination, redox and surface reactions. 1983 (0 471-08683-5) 446 pp.
Author : David J. Vaughan
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 1501509497
Total Pages : 728 pages
Book Rating : 4.5/5 (15 download)
Download or read book Sulfide Mineralogy and Geochemistry written by David J. Vaughan and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 61 of Reviews in Mineralogy and Geochemistry presents an up-to-date review of sulfide mineralogy and geochemistry. The crystal structures, electrical and magnetic properties, spectroscopic studies, chemical bonding, thermochemistry, phase relations, solution chemistry, surface structure and chemistry, hydrothermal precipitation processes, sulfur isotope geochemistry and geobiology of metal sulfides are reviewed. Where it is appropriate for comparison, there is brief discussion of the selenide or telluride analogs of the metal sulfides. When discussing crystal structures and structural relationships, the sulfosalt minerals as well as the sulfides are considered in some detail.
Author :
Publisher :
ISBN 13 :
Total Pages : 954 pages
Book Rating : 4.3/5 (555 download)
Download or read book Applied and Environmental Microbiology written by and published by . This book was released on 1991 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David L. Parkhurst
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.3/5 (91 download)
Download or read book User's Guide to PHREEQC written by David L. Parkhurst and published by . This book was released on 1995 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James A. Kittrick
Publisher : Soil Science Society of America
ISBN 13 : 9780891187691
Total Pages : 234 pages
Book Rating : 4.1/5 (876 download)
Download or read book Acid Sulfate Weathering written by James A. Kittrick and published by Soil Science Society of America. This book was released on 1982-12 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 386 pages
Book Rating : 4.3/5 (91 download)
Download or read book Current Opinion in Biotechnology written by and published by . This book was released on 1992 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David L. Parkhurst
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781500563103
Total Pages : 518 pages
Book Rating : 4.5/5 (631 download)
Download or read book Description of Input and Examples for Phreeqc Version 3 written by David L. Parkhurst and published by Createspace Independent Publishing Platform. This book was released on 2014-07-17 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: PHREEQC version 3 is a computer program written in the C and C++ programming languages that is designed to perform a wide variety of aqueous geochemical calculations. PHREEQC implements several types of aqueous models: two ion-association aqueous models (the Lawrence Livermore National Laboratory model and WATEQ4F), a Pitzer specific-ion-interaction aqueous model, and the SIT (Specific ion Interaction Theory) aqueous model. Using any of these aqueous models, PHREEQC has capabilities for (1) speciation and saturation-index calculations; (2) batch-reaction and one-dimensional (1D) transport calculations with reversible and irreversible reactions, which include aqueous, mineral, gas, solid-solution, surface-complexation, and ion-exchange equilibria, and specified mole transfers of reactants, kinetically controlled reactions, mixing of solutions, and pressure and temperature changes; and (3) inverse modeling, which finds sets of mineral and gas mole transfers that account for differences in composition between waters within specified compositional uncertainty limits.
Author : George William Clarkson Kaye
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (45 download)
Download or read book Tables of Physical and Chemical Constants and Some Mathematical Functions written by George William Clarkson Kaye and published by . This book was released on 1911 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
