Download or read book Desulfurization and Deashing of Coal by Chemical Leaching written by Chin-Yeh Chi and published by . This book was released on 1981 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Desulfurization written by Robert Allen Meyers and published by Marcel Dekker. This book was released on 1977 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Desulfurization written by S. K. Kawatra and published by Taylor & Francis. This book was released on 2001 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was written to provide a comprehensive survey of the current state-of-the-art information in coal preparation, with particular emphasis on coal desulfrization. The primary audience for this book will be practising coal preparation engineers who need complete information about all of the coal preparation and desulphurization technologies that are available now, or that may be available in the future. It will also be valuable for coal researchers who need details and comparative data for cutting-edge technologies that are still under development. The main emphasis is on physical coal preparation, but chapters also include chemical and biological technologies that are under development, but not yet used in industrial practice. Along with the successful technologies, also included are details of processes and techniques that were attempted, but were subsequently abandoned, along with discussions of the reasons they were abandoned.
Download or read book Investigation of Chemical Desulfurization of Illinois Coals by High Temperature Copper Ion Leaching written by Ferozkhan A. Lodi and published by . This book was released on 1986 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Desulfurization of Coal by Microbiological Leaching written by Arpad E. Torma and published by . This book was released on 1981 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrasonic Coal Wash for De Ashing and De Sulfurization written by B. Ambedkar and published by Springer Science & Business Media. This book was released on 2012-01-03 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study focuses on the physical aspects of ultrasonic de-ashing and de-sulfurization, such as cavitation, streaming and their combined effects. Ambedkar Balraj proposes an ultrasound-assisted coal particle breakage mechanism and explores aqueous and solvent-based ultrasonic techniques for de-ashing and de-sulfurization. Ambedkar designs a Taguchi L-27 fractional-factorial matrix to assess the individual effects of key process variables. In this volume he also describes process optimization and scale-up strategies. The author provides a mechanism-based model for ultrasonic reagent-based coal de-sulfurization, proposes a flow diagram for ultrasonic methods of high-throughput coal-wash and discusses the benefits of ultrasonic coal-wash. Coal will continue to be a major fuel source for the foreseeable future and this study helps improve its use by minimising ash and sulfur impurities.
Download or read book Coal Desulfurization Prior to Combustion written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Since current coal cleaning processes remove only a fraction of the total sulfur, the question arises as to what fraction of US coals can be cleaned within current EPA new source standards (1.2 lb. SO2 per MMBTU). A number of studies has shown the fraction to be encouragingly large. A report on the applicability of the Meyers process estimates, on the basis of 35 coals sampled, that 40% of the samples could be burned cleanly after some combination of physical separation and chemical leaching. A report by Ergun on coal cleaning gives the higher estimate of cleanability of 56%, based on 455 samples properly weighted between Eastern and Western coals. Beyond this figure, Ergun estimates an additional 17% is cleanable if 30 to 40% of the organic sulfur is removed, bringing the total cleanable to 73%. Data from a study by Cavallaro, with coal reserves taken from a study by Beekers, give an estimate in agreement with that of Ergun on the amount of coal cleanable by pyrite removal. In summary, cleanable coal reserves increase by 33% if processes are used which can remove what are probably the more reactive organic sulfur species, such as aliphatic mercaptans, sulfides, and disulfides. A process which attacks the refractor thiophenic sulfur could conceivably increase the cleanable coal reserves by another 20 to 30%, assuming roughly equal distribution between reactive and refractory organic sulfur.
Download or read book Coal Desulfurization written by Thomas D. Wheelock and published by . This book was released on 1977 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a symposium sponsored by the Division of Fuel Chemistry at the 173rd meeting of the American Chemical Society.
Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology Quarterly Technical Progress Report April 1 1977 June 30 1977 written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The improvement and technical development of several promising methods for desulfurizing and recovering fine coal were continued. These methods include froth flotation, selective oil agglomeration, pelletization, and a chemical desulfurization process which involves leaching fine coal with a hot dilute solution of sodium carbonate containing dissolved oxygen or air under pressure. Numerous laboratory experiments and measurements were carried out to advance the state of this technology. It was shown that the chemical leaching process removed most of the inorganic sulfur from several high sulfur coals as well as a significant amount of organic sulfur from some of the coals. Higher temperatures and/or oxygen partial pressures resulted in more organic sulfur being removed in some instances. Also it was shown that the rate of conversion of pyrite to soluble sulfates depends on particle size and alkali concentration as well as oxygen partial pressure and flow rate. In addition the effectiveness of a chemical pretreatment step for improving the separation of coal and pyrite by oil agglomeration was demonstrated. Among various fuel oils tested for agglomerating coal, No. 1 or 2 provided greater sulfur reduction than No. 5 or 6. Also the lighter fuel oils seemed better suited to agglomerating finely ground coal. However, No. 6 fuel oil was adapted to the agglomeration of ball milled coal by diluting it with a lighter oil. Construction was started on a bench-scale flow system for demonstrating the beneficiation and recovery of fine-size coal by various methods. Furthermore the suitability of the ASTM method for determining pyritic sulfur in coal was confirmed for certain high volatile C bituminous coals. Confirmation was obtained by scanning electron microscope/energy dispersive x-ray analyses.
Download or read book Coal Desulfurization and Deashing by Surface Chemical Methods written by Stuart Carleton Schmitz and published by . This book was released on 1982 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Desulphurization Via Chemical Leaching with Aqueous Solutions of Sodium Sulphide and Polysulphide written by James A. Mesher and published by . This book was released on 1979 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology Annual Technical Progress Report October 1 1976 September 1977 54 References written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Work has been carried out to develop and improve several promising methods for desulfurizing and recovering fine-size coal. These methods included froth flotation, selective oil agglomeration, pelletization, and a chemical desulfurization process which involves leaching fine coal with a hot dilute solution of sodium carbonate containing dissolved oxygen or air under pressure. This process is an oxydesulfurization process which utilizes an alkaline solution instead of an acidic solution for leaching coal. The results of experiments with a small autoclave showed that more sulfur, both organic and inorganic, was removed from several high-sulfur bituminous coals when a dilute solution of alkali was used than when a dilute acid solution was used for leaching under the same conditions of time, temperature, and oxygen partial pressure. On the other hand, the heating value recovery was somewhat higher when acidic solutions were used. Also it was shown that pure oxygen is more effective than air, even though the oxygen partial pressure was kept the same, for oxydesulfurization of coal in either acidic or alkaline solutions. In addition it was found that the removal of organic sulfur by alkaline solutions increased as the oxygen partial pressure was raised. Although small concentrations of alkali were beneficial, large concentrations were detrimental. In order to improve the physical separation of coal and pyrite particles by froth flotation or oil agglomeration, various surface chemical treatments were tested. The most successful treatment involved treating the coal or pyrite particles with a warm, dilute alkaline solution which was aerated to provide mildly oxidizing conditions.
Download or read book Desulfurization of Various Midwestern Coals by Flotation written by Kenneth J. Miller and published by . This book was released on 1977 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Desulfurization of an Ohio Coal by Microbiological Leaching written by Thomas Michael Olsen and published by . This book was released on 1980 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Simulation and Kinetic Study of Coal Desulfurization in a Batch Leaching Process written by Meei-Lih Lin and published by . This book was released on 1985 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological Coal Desulfurization written by Ming Le and published by . This book was released on 1991 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sulfur removal from coal before combustion is of considerable interest to avoid emission of oxides of sulfur(SOx). Chemical and physical methods have been developed for removing the inorganic sulfur component in coal. This component is generally associated with pyrites(FeS2). However, no commercial methods have been developed for the removal of the organic sulfur conponent. This study describes microbial methods for removing organically bound sulfur from coal. The specific goals of this study were to ascertain whether a robust biologically active population such as activated sludge biomass can remove organic sulfur from coal and to devise sulfur analytical methods that are less cumbersome than the accepted standards for screening research results. Dibenzothiophene is used in isolating microorganisms that use sulfur as the sole source for growth. It was found that about 55% sulfur can be removed by activated sludge in shaker flasks from a coal which was previously treated to remove inorganic sulfur(IBC-108). A no cycling leaching reactor with activated sludge removed 50% sulfur from the same type of coal. Almost 72% sulfur is removed by A-i, S-Dl, T3-2 and Ar-i mixed cultures. It was also found that about 25 to 29% sulfur can be removed by different cultures from a commercially prepared washed coal in which the pyritic and organic sulfur have not been altered. The application of ion-chromatography and atomic spectrometry in analyzing sulfate, pyritic sulfur, organic sulfur and total sulfur following ASTM extraction can achieve easier and quicker sulfur determinations without sacrificing accuracy and reproducibility.
Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology Quarterly Technical Progress Report January 1 1977 March 31 1977 written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The improvement and technical development of several promising methods for desulfurizing and recovering fine coal was continued. These methods include froth flotation, selective oil agglomeration, pelletization, and a chemical desulfurization process which involves leaching fine coal with a hot dilute solution of sodium carbonate containing dissolved oxygen or air under pressure. Numerous laboratory experiments and measurements were conducted in the areas of froth flotation, selective oil agglomeration and chemical desulfurization. The results showed that when pyrites are leached with an alkaline solution containing dissolved oxygen, the sulfur is extracted in the form of soluble sulfates and the iron is converted to ferric oxide or hematite. It was also shown that the rate of conversion of pyritic sulfur to soluble sulfates depends on the oxygen partial pressure with the rate increasing as the partial pressure is raised. Results which could lead to major improvements in the froth flotation method of separating coal and pyrites included the successful demonstration of an oxidative chemical pretreatment process which would greatly reduce the floatability of pyrite particles without greatly affecting the floatability of coal. Also conditions were identified which would aid in the selection of suitable cationic and anionic flotation collectors for effecting a better separation of coal and pyrite. The discovery that it may be possible to utilize relatively inexpensive, heavy residual fuel oils instead of light distillates for the selective agglomeration of fine coal enhances the economic viability of this method of coal beneficiation.
