Download or read book Surface Characteristics and Dissolution Kinetics of Two Standard Kaolinites written by Qunhui Zhou and published by . This book was released on 1996 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water rock Interaction written by Richard B. Wanty and published by Taylor & Francis US. This book was released on 2004 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissolution Kinetics of Ni II Surface Precipitates on Kaolinite written by and published by . This book was released on 2000 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Program and Abstracts for Clay Minerals Society Annual Meeting written by Clay Minerals Society. Meeting and published by . This book was released on 1997 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kaolinite Dissolution and Precipitation Kinetics at 22oC and PH4 written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissolution and precipitation rates of low defect Georgia kaolinite (KGa-1b) as a function of Gibbs free energy of reaction (or reaction affinity) were measured at 22 C and pH 4 in continuously stirred flow through reactors. Steady state dissolution experiments showed slightly incongruent dissolution, with a Si/Al ratio of about 1.12 that is attributed to the re-adsorption of Al on to the kaolinite surface. No inhibition of the kaolinite dissolution rate was apparent when dissolved aluminum was varied from 0 and 60 [mu]M. The relationship between dissolution rates and the reaction affinity can be described well by a Transition State Theory (TST) rate formulation with a Temkin coefficient of 2 R{sub diss} (mol/m2s) = 1.15 x 10−13 [1-exp( -[Delta]G/2RT)]. Stopping of flow in a close to equilibrium dissolution experiment yielded at solubility constant for kaolinite at 22 C of 10{sup 7.57}. Experiments on the precipitation kinetics of kaolinite showed a more complex behavior. One conducted using kaolinite seed that had previously undergone extensive dissolution under far from equilibrium conditions for 5 months showed a quasi-steady state precipitation rate for 105 hours that was compatible with the TST expression above. After this initial period, however, precipitation rates decreased by an order of magnitude, and like other precipitation experiments conducted at higher supersaturation and without kaolinite seed subjected to extensive prior dissolution, could not be described with the TST law. The initial quasi-steady state rate is interpreted as growth on activated sites created by the dissolution process, but this reversible growth mechanism could not be maintained once these sites were filled. Long-term precipitation rates showed a linear dependence on solution saturation state that is generally consistent with a two dimensional nucleation growth mechanism following the equation R{sub ppt}(mol/m2s) = 3.38 x 10−14 exp[181776/T21n[Omega]]. Further analysis using Synchrotron Scanning Transmission X-ray Microscopy (STXM) in Total Electron Yield (TEY) mode of the material from the precipitation experiments showed spectra for newly precipitated material compatible with kaolinite.
Download or read book Surface and Ground Water Weathering and Soils written by J.I. Drever and published by Elsevier. This book was released on 2005-11-21 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 5 has several objectives. The first is to present an overview of the composition of surface and ground waters on the continents and the mechanisms that control the compositions. The second is to present summaries of the tools and methodologies used in modern studies of the geochemistry of surface and ground waters. The third is to present information on the role of weathering and soil formation in geochemical cycles: weathering affects the chemistry of the atmosphere through uptake of carbon dioxide and oxygen, and paleosols (preserved soils in the rock record) provide information on the composition of the atmosphere in the geological past. Reprinted individual volume from the acclaimed Treatise on Geochemistry (10 Volume Set, ISBN 0-08-043751-6, published in 2003). - Present an overview of the composition of surface and ground waters on the continents and the mechanisms that control the compositions - Provides summaries of the tools and methodologies used in modern studies of the geochemistry of surface and ground waters - Features information on the role of weathering and soil formation in geochemical cycles - Contains information on the composition of the atmosphere in the geological past - Reprinted individual volume from the acclaimed Treatise on Geochemistry, 10 volume set
Download or read book Kaolinite Dissolution and Precipitation Kinetics at 22oC and PH 4 written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissolution and precipitation rates of low defect Georgia kaolinite (KGa-1b) as a function of Gibbs free energy of reaction (or reaction affinity) were measured at 22 C and pH 4 in continuously stirred flowthrough reactors. Steady state dissolution experiments showed slightly incongruent dissolution, with a Si/Al ratio of about 1.12 that is attributed to the re-adsorption of Al on to the kaolinite surface. No inhibition of the kaolinite dissolution rate was apparent when dissolved aluminum was varied from 0 and 60 [mu]M. The relationship between dissolution rates and the reaction affinity can be described well by a Transition State Theory (TST) rate formulation with a Temkin coefficient of 2 R{sub diss} (mol/m2s) = 1.15 x 10−13 [1-exp( -[Delta]G/2RT)]. Stopping of flow in a close to equilibrium dissolution experiment yielded a solubility constant for kaolinite at 22 C of 10{sup 7.57}. Experiments on the precipitation kinetics of kaolinite showed a more complex behavior. One conducted using kaolinite seed that had previously undergone extensive dissolution under far from equilibrium conditions for 5 months showed a quasi-steady state precipitation rate for 105 hours that was compatible with the TST expression above. After this initial period, however, precipitation rates decreased by an order of magnitude, and like other precipitation experiments conducted at higher supersaturation and without kaolinite seed subjected to extensive prior dissolution, could not be described with the TST law. The initial quasi-steady state rate is interpreted as growth on activated sites created by the dissolution process, but this reversible growth mechanism could not be maintained once these sites were filled. Long-term precipitation rates showed a linear dependence on solution saturation state that is generally consistent with a two dimensional nucleation growth mechanism following the equation R{sub ppt}(mol/m2s) = 3.38 x 10−14 exp[- 181776/T2 1n[Omega]]. Further analysis using Synchrotron Scanning Transmission X-ray Microscopy (STXM) in Total Electron Yield (TEY) mode of the material from the precipitation experiments showed spectra for newly precipitated material compatible with kaolinite. An idealized set of reactive transport simulations of the chemical weathering of albite to kaolinite using rate laws from HELLMANN and TISSERAND (2006) and this study respectively indicate that while pore waters are likely to be close to equilibrium with respect to kaolinite at pH 4, significant kaolinite supersaturation may occur at higher pH if its precipitation rate is pH dependent.
Download or read book Dissolution of Two Clay Minerals Society Standard Kaolinites by the Aerobic Bacteria Pseudomonas Mendocina Var written by Melanie Anne Vierkorn and published by . This book was released on 1999 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectroscopic Methods in the Study of Kaolin Minerals and Their Modifications written by Jacob (Theo) Kloprogge and published by Springer. This book was released on 2018-12-10 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book systematically provides an overview of the use of a wide range of spectroscopic methods (Mid- and Near-Infrared, Infrared Emission, Raman, Solid-State Magic Angle Spinning Nuclear Magnetic Resonance, X-ray Photoelectron, Extended X-ray Absorption Fine Structure, X-ray Absorption Near Edge, Electron Spin and Mössbauer spectroscopy) to investigate kaolin minerals (kaolinite, dickite, nacrite and halloysite) and their modifications (intercalation compounds, nanocomposites and other modifications).
Download or read book Phase Transformation of Kaolinite Clay written by Akshoy Kumar Chakraborty and published by Springer Science & Business Media. This book was released on 2013-11-29 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book depicts comprehensive studies on thermal decomposition of Kaolinite by different physico-chemical methods carried out by various scientists in last 100 years and results of the studies conducted by author in past 33 years. It also provides a critical analysis of different views on Kaolinite–Mullite reaction series, characterization of controversial spinel phase in Kaolinite–Mullite reaction series and explanation of DTA events of Kaolinite. The book helps both researchers and students to realise the new mechanism of transformation of Kaolinite to Mullite. The new reaction processes discussed in the book also help ceramic experts to synthesize Mullite grains in commercial way for production of Mullite porcelain and Mullite refractory.
Download or read book Mineralogical Abstracts written by and published by . This book was released on 2002 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermodynamics and Kinetics of Water Rock Interaction written by Eric H. Oelkers and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 70 of Reviews in Mineralogy and Geochemistry represents an extensive review of the material presented by the invited speakers at a short course on Thermodynamics and Kinetics of Water-Rock Interaction held prior to the 19th annual V. M. Goldschmidt Conference in Davos, Switzerland (June 19-21, 2009). Contents: Thermodynamic Databases for Water-Rock Interaction Thermodynamics of Solid Solution-Aqueous Solution Systems Mineral Replacement Reactions Thermodynamic Concepts in Modeling Sorption at the Mineral-Water Interface Surface Complexation Modeling: Mineral Fluid Equilbria at the Molecular Scale The Link Between Mineral Dissolution/Precipitation Kinetics and Solution Chemistry Organics in Water-Rock Interactions Mineral Precipitation Kinetics Towards an Integrated Model of Weathering, Climate, and Biospheric Processes Approaches to Modeling Weathered Regolith Fluid-Rock Interaction: A Reactive Transport Approach Geochemical Modeling of Reaction Paths and Geochemical Reaction Networks
Download or read book Handbook of Monochromatic XPS Spectra written by B. Vincent Crist and published by John Wiley & Sons. This book was released on 2000-10-19 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: These three volumes provide comprehensive information about the instrument, the samples, and the methods used to collect the spectra. The spectra are presented on a landscape format and cover a wide variety of elements,polymers, semiconductors, and other materials. Offers a clear presentation of spectra with the rightamount of experimental detail. All of the experiments have been conducted under controlled conditions on the same instrument by aworld-renowned expert.
Download or read book Essential Readings in Light Metals Alumina and Bauxite written by Don Donaldson and published by John Wiley & Sons. This book was released on 2013-04-05 with total page 1195 pages. Available in PDF, EPUB and Kindle. Book excerpt: ONE OF A FOUR-BOOK COLLECTION SPOTLIGHTING CLASSIC ARTICLES Five decades of landmark original research findings andreviews Highlighting some of the most important findings reported overthe past five decades, this volume features some of the besttechnical papers published on alumina and bauxite from 1963 to2011. Papers have been divided into thirteen subject sections forease of access. Each section has a brief introduction and a list ofrecommended articles for researchers interested in exploring eachsubject in greater depth. Only about fifteen percent of the alumina and bauxite papersever published in Light Metals were chosen for this volume.Selection was based on a rigorous review process. Among the papers,readers will find landmark original research findings and expertreviews summarizing current thinking on key topics at the time ofpublication. From basic research to advanced applications, the articlespublished in this volume collectively represent our body ofknowledge in alumina and bauxite. Students, scientists, andengineers should turn to this volume to discover the historicaldevelopment of alumina and bauxite research as well as the currentstate of the science and the technology. Moreover, the paperspublished in this volume will serve as a springboard for futureresearch and discoveries.
Download or read book Essential Readings in Light Metals Volume 1 Alumina and Bauxite written by Don Donaldson and published by Springer. This book was released on 2017-01-04 with total page 1168 pages. Available in PDF, EPUB and Kindle. Book excerpt: ONE OF A FOUR-BOOK COLLECTION SPOTLIGHTING CLASSIC ARTICLES Five decades of landmark original research findings and reviews Highlighting some of the most important findings reported over the past five decades, this volume features some of the best technical papers published on alumina and bauxite from 1963 to 2011. Papers have been divided into thirteen subject sections for ease of access. Each section has a brief introduction and a list of recommended articles for researchers interested in exploring each subject in greater depth. Only about fifteen percent of the alumina and bauxite papers ever published in Light Metals were chosen for this volume. Selection was based on a rigorous review process. Among the papers, readers will find landmark original research findings and expert reviews summarizing current thinking on key topics at the time of publication. From basic research to advanced applications, the articles published in this volume collectively represent our body of knowledge in alumina and bauxite. Students, scientists, and engineers should turn to this volume to discover the historical development of alumina and bauxite research as well as the current state of the science and the technology. Moreover, the papers published in this volume will serve as a springboard for future research and discoveries.
Download or read book The Chemistry of Weathering written by J.I. Drever and published by Springer Science & Business Media. This book was released on 1985-03-31 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several important developments in our understanding of the chemistry of weathering have occurred in the last few years: 1. There has been a major breakthrough in our understanding of the mechanisms controlling the kinetics of sil icate dissolution, and there have been major advances in computer modeling of weathering processes. 2. There has been a growing recognition of the importance of organic solutes in the weathering process, and hence of the inter-relationships between mineral weathering and the terrestrial ecosystem. 3. The impact of acid deposition ("acid rain") has been widely recognized. The processes by which acid deposition is neutral ized are closely related to the processes of normal chemical weathering; an understanding of the chemistry of weathering is thus essential for predicting the effects of acid deposition. 4. More high-qual ity data have become available on the chemical dynamics of smal I watersheds and large river systems, which represent the integrated effects of chemical weathering.
Download or read book Spring Meeting written by American Geophysical Union. Meeting and published by . This book was released on 1993 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
