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Near Neutral Oxidation Of Pyrite In Coal Slurry Solids Quarterly Report 1 December 1994 28 February 1995
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Book Synopsis Near-neutral Oxidation of Pyrite in Coal Slurry Solids. Quarterly Report, 1 December 1994--28 February 1995 by :
Download or read book Near-neutral Oxidation of Pyrite in Coal Slurry Solids. Quarterly Report, 1 December 1994--28 February 1995 written by and published by . This book was released on 1995 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research project we plan to determine the rate of oxidation of pyrite associated with coaly particles when the pH of the surrounding environment is held at approximately 7.8. Coaly particles that contain pyrite are generated during the preparation of Illinois Basin coal for market. These particles are discharged to an impoundment, which eventually must be reclaimed. The purpose for reclamation is either to prevent the Generation of acidic solution as the pyrite in the coal slurry solid reacts with air, or to prevent the migration of the acidic solution to a groundwater aquifer. The reclamation is usually accomplished by covering the impoundment with a four-foot-thick layer of topsoil. One possible alternative method for reclamation of a coal slurry impoundment is to mix in alkaline residue from the fluidized-bed combustion of coal. This codisposal would slow the production of acid and would also neutralize any acid produced. If the codisposal method is found to be environmentally acceptable, it will save the coal mining companies part of their cost of reclamation, and also provide a safe and useful disposal outlet for a portion of the residue that is Generated by the fluidized-bed combustion of coal.
Book Synopsis Near-neutral Oxidation of Pyrite in Coal Slurry Solids. Technical Report, March 1--May 31, 1995 by :
Download or read book Near-neutral Oxidation of Pyrite in Coal Slurry Solids. Technical Report, March 1--May 31, 1995 written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research project are determining the rate of oxidation of pyrite associated with coaly particles (coal slurry solid) when the pH of the surrounding environment is held at approximately 7.8. Coaly particles that contain pyrite are generated during the preparation of Illinois Basin coal for market. These particles are discharged to an impoundment, which eventually must be reclaimed. The purpose for reclamation is either to prevent the generation of acidic solution as the pyrite in the coal slurry solid reacts with air, or to prevent the migration of the acidic solution to a groundwater aquifer. The reclamation is usually accomplished by covering the impoundment with a four-foot-thick layer of topsoil. One possible alternative method for reclamation of a coal slurry impoundment is to mix in alkaline residue from the fluidized-bed combustion of coal. This codisposal would slow the production of acid and would also neutralize any acid produced. If the codisposal method is found to be environmentally acceptable, it will save the coal mining companies part of their cost of reclamation, and also provide a safe and useful disposal outlet for a portion of the residue that is generated by the fluidized-bed combustion of coal. Pyrite oxidation experiments were conducted during the quarter in the following manner. Air, free of carbon dioxide, is bubbled through water in a covered beaker. The pH is adjusted to 7.8 and the solution is circulated by a peristaltic pump through the coal slurry sample contained in a cellulose thimble in a Soxhlet tube mounted above the beaker. The pH of the solution is continuously statted to 7.8 by addition of NaOH solution. Samples are pipetted from the reaction solution for sulfate determination. The rate of oxidation of pyrite in coal slurry solids sample CSS-2a was calculated from the rate of production of sulfate ion to be 1.71[times] 10[sup[minus]6][micro]mole pyrite per minute per[micro]mole of pyrite present.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Near-neutral Oxidation of Pyrite in Coal Slurry Solids. [Quarterly] Technical Report, September 1--November 30, 1994 by :
Download or read book Near-neutral Oxidation of Pyrite in Coal Slurry Solids. [Quarterly] Technical Report, September 1--November 30, 1994 written by and published by . This book was released on 1994 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research project we plan to determine the rate of oxidation of pyrite associated with coaly particles (coal slurry solid) when the pH of the surrounding environment is held at approximately 7.8. Coaly particles that contain pyrite are generated during the preparation of Illinois Basin coal for market. These particles are discharged to an impoundment, which eventually must be reclaimed. The purpose for reclamation is either to prevent the generation of acidic solution as the pyrite in the coal slurry solid reacts with air, or to prevent the migration of the acidic solution to a groundwater aquifer. The reclamation is usually accomplished by covering the impoundment with a four-foot-thick layer of topsoil. One possible alternative method for reclamation of a coal slurry impoundment is to mix in alkaline residue from the fluidized-bed combustion of coal. This codisposal would slow the production of acid and would also neutralize any acid produced. If the codisposal method is found to be environmentally acceptable, it will save the coal mining companies part of their cost of reclamation, and also provide a safe and useful disposal outlet for a portion of the residue that is generated by the fluidized-bed combustion of coal. During this quarter we purchased and set up two automatic titrators, which will be used in determining the rate of pyrite oxidation at nearly neutral pH. The titrators will provide a means for maintaining the pH at the desired level. The rate at which sulfate ion is produced as a result of pyrite oxidation will be used to measure the amount of pyrite oxidized over time.
Book Synopsis Near-neutral Oxidation of Pyrite in Coal Slurry Solids by :
Download or read book Near-neutral Oxidation of Pyrite in Coal Slurry Solids written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oxidation of Coal Mine Pyrites by : Walter C. Lorenz
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:
Book Synopsis Oxidation of Coal and Coal Pyrite Mechanisms and Influence on Surface Characteristics. Quarterly Technical Progress Report, December 1, 1993--May 31, 1994 by :
Download or read book Oxidation of Coal and Coal Pyrite Mechanisms and Influence on Surface Characteristics. Quarterly Technical Progress Report, December 1, 1993--May 31, 1994 written by and published by . This book was released on 1996 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to develop a mechanistic understanding of the oxidation of coal and coal pyrite, and to correlate the intrinsic physical and chemical properties of these minerals, along with changes resulting from oxidation, with those surface properties that influence the behavior in physical cleaning processes. The results will provide fundamental insight into oxidation, in term of the bulk and surface chemistry, the microstructure, and the semiconductor properties of the pyrite. During the fourteenth and fifteenth quarters, flotation tests were done on Upper Freeport coal from the Troutville No. 2 Mine, Clearfield County, Pennsylvania and on coal samples from the Pennsylvania State Coal Bank. The influence of electrode potential on the surface properties of coal pyrite was tested using contact angle measurements on polarized Pittsburgh coal pyrite electrode.
Book Synopsis Controlling Incipient Oxidation of Pyrite for Improved Rejection. Technical Progress Report for the Ninth Quarter, October 1-December 31, 1994 by :
Download or read book Controlling Incipient Oxidation of Pyrite for Improved Rejection. Technical Progress Report for the Ninth Quarter, October 1-December 31, 1994 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Semiconductor Electrochemistry Coal Pyrite. Quarterly Technical Progress Report, October--December 1994 by :
Download or read book Semiconductor Electrochemistry Coal Pyrite. Quarterly Technical Progress Report, October--December 1994 written by and published by . This book was released on 1995 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pyrite dissolution in acidic solution was found to involve both electrochemical oxidation and chemical decomposition. The mechanism of chemical decomposition of pyrite in acidic solution may involve surface complexation of hydrogen ions. The anodic current of pyrite was relatively small in non-aqueous solution (acetonitrile) compared with that in aqueous solution. The implication is that the direct reaction of holes with S22− in the pyrite lattice was not significant and that the dissolution of pyrite required the presence of water. The anodic dissolution product was elemental sulfur which was detected by X-ray diffraction.
Book Synopsis Mechanisms of Pyrite Oxidation to Non-slagging Species. Quarterly Report, October 1, 1995-December 31, 1995 by :
Download or read book Mechanisms of Pyrite Oxidation to Non-slagging Species. Quarterly Report, October 1, 1995-December 31, 1995 written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanisms of Pyrite Oxidation to Non-slagging Species. Quarterly Report, April 1, 1995--June 30, 1995 by :
Download or read book Mechanisms of Pyrite Oxidation to Non-slagging Species. Quarterly Report, April 1, 1995--June 30, 1995 written by and published by . This book was released on 1995 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document is the fourth quarterly status report on a project that is conducted at the High Temperature Gasdynamics Laboratory at Stanford University, Stanford, California and is concerned with enhancing the transformation of iron pyrite to non-slagging species during staged, low-NO(subscript x) pulverized coal (P.C.) combustion. The research project is intended to advance PETC's efforts to improve our technical understanding of the high-temperature chemical and physical processes involved in the utilization of coal. The work focuses on the mechanistic description and rate quantification of the effects of fuel properties and combustion environment on the oxidation of iron pyrite to form the non-slagging species magnetite. The knowledge gained from this work is intended to be incorporated into numerical codes that can be used to formulate anti-slagging strategies involving minimal disturbance of coal combustor performance. This project is to be performed over the three-year period from September 1994 to August 1997. The project aims to identify the mechanisms of pyrite combustion and to quantify their effects, in order to formulate a general rate expression for the combustion of pyrite that accounts for coal properties as well as furnace conditions.
Book Synopsis Novel Catalysts for Upgrading Coal-derived Liquids. Quarterly Technical Progress Report, December 1, 1994-February 28, 1995 by :
Download or read book Novel Catalysts for Upgrading Coal-derived Liquids. Quarterly Technical Progress Report, December 1, 1994-February 28, 1995 written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Pyrite Surface Chemistry in Physical Coal Cleaning. Tenth Quarterly Progress Report, December 1, 1991--February 29, 1992 by :
Download or read book Control of Pyrite Surface Chemistry in Physical Coal Cleaning. Tenth Quarterly Progress Report, December 1, 1991--February 29, 1992 written by and published by . This book was released on 1992 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most difficult separations in minerals processing involves the differential flotation of pyrite and coal. Under practical flotation conditions, they are both hydrophobic and no cost-effective method has been developed to efficiently reject the pyrite. The problem arises from inherent floatability of coal and pyrite. Coal is naturally hydrophobic and remains so under practical flotation. Although pyrite is believed to be naturally hydrophilic under practical flotation conditions it undergoes a relatively rapid incipient oxidation reaction that causes ''self-induced'' flotation. The oxidation product responsible for ''self-induced'' flotation is believed to be a metal polysulfide, excess sulfur in the lattice, or in some cases elemental sulfur. It is believed that if incipient oxidation of pyrite could be prevented, good pyrite rejection could be obtained. In order to gain a better understanding of how pyrite oxidizes, a new method of preparing fresh, unoxidized pyrite surfaces and a new method of studying pyrite oxidation have been developed this reporting period.
Book Synopsis Oxidation of Coal and Coal Pyrite Mechanisms and Influence on Surface Characteristics. Technical Progress Report, December 1, 1993--May 31, 1994 by :
Download or read book Oxidation of Coal and Coal Pyrite Mechanisms and Influence on Surface Characteristics. Technical Progress Report, December 1, 1993--May 31, 1994 written by and published by . This book was released on 1994 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to develop a mechanistic understanding of the oxidation of coal and coal pyrite, and to correlate the intrinsic physical and chemical properties of these minerals, along with changes resulting from oxidation, with those surface properties that influence the behavior in physical cleaning processes. The results will provide fundamental insight into oxidation, in term of the bulk and surface chemistry, the microstructure, and the semiconductor properties of the pyrite. During the fourteenth and fifteenth quarters, flotation tests were done on Upper Freeport coal from the Troutvill {number_sign}2 Mine, Clearfield County, Pennsylvania and on coal samples from the Pennsylvania State Coal Bank. The influence of electrode potential on the surface properties of coal pyrite was tested using contact angle measurements on polarized Pittsburgh coal pyrite electrode.
Book Synopsis Control of Pyrite Surface Chemistry in Physical Coal Cleaning. Final Report by :
Download or read book Control of Pyrite Surface Chemistry in Physical Coal Cleaning. Final Report written by and published by . This book was released on 1993 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Part I, Surface Chemistry of Coal Pyrite the mechanisms responsible for the inefficient rejection of coal pyrite were investigated using a number of experimental techniques. The test results demonstrate that the hydrophobicity of coal pyrite is related to the surface products formed during oxidation in aqueous solutions. During oxidation, a sulfur-rich surface layer is produced in near neutral pH solutions. This surface layer is composed mainly of sulfur species in the form of an iron-polysulfide along with a smaller amount of iron oxide/hydroxides. The floatability coal pyrite increases dramatically in the presence of frothers and hydrocarbon collectors. These reagents are believed to absorb on the weakly hydrophobic pyrite surfaces as a result of hydrophobic interaction forces. In Part III, Developing the Best Possible Rejection Schemes, a number of pyrite depressants were evaluated in column and conventional flotation tests. These included manganese (Mn) metal, chelating agents quinone and diethylenetriamine (DETA), and several commercially-available organic depressants. Of these, the additives which serve as reducing agents were found to be most effective. Reducing agents were used to prevent pyrite oxidation and/or remove oxidation products present on previously oxidized surfaces. These data show that Mn is a significantly stronger depressant for pyrite than quinone or DETA. Important factors in determining the pyrite depression effect of Mn include the slurry solid content during conditioning, the addition of acid (HCl), and the amount of Mn. The acid helps remove the oxide layer from the surface of Mn and promotes the depression of pyrite by Mn.
Book Synopsis Removal of Pyrite and Trace Elements from Waste Coal by Dissolved-CO2 Flotation and Chelating Agents. [Quarterly] Technical Report, December 1, 1993--February 28, 1994 by :
Download or read book Removal of Pyrite and Trace Elements from Waste Coal by Dissolved-CO2 Flotation and Chelating Agents. [Quarterly] Technical Report, December 1, 1993--February 28, 1994 written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: In dissolved-CO2 flotation, ultrafine -bubbles are generated by CO2 dissolved in water. The ultrafine bubbles have the potential to improve the separation efficiency in fine coal cleaning. Chemicals will be used prior to or during dissolved-CO2 flotation to improve the separation efficiency-CO2 of pyrite and other minerals including trace metals from coal. Chelating agent will be applied to clean coal to further reduce the trace metals from coal. During this period, a 3 in. diameter packed column has been purchased and installed. This column was then modified for use in dissolved-CO2 flotation. Coal samples of Illinois No. 6 coal are being prepared for flotation. Preliminary flotation tests were performed on Illinois No. 6 waste coal.
Book Synopsis Mechanisms of Pyrite Oxidation to Non-slagging Species. Quarterly Report, January 1, 1995--March 31, 1995 by :
Download or read book Mechanisms of Pyrite Oxidation to Non-slagging Species. Quarterly Report, January 1, 1995--March 31, 1995 written by and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document is the third quarterly status report on a project conducted at the High Temperature Gasdynamics Laboratory at Stanford University, Stanford, California and concerned with enhancing the transformation of iron pyrite to non-slagging species during staged, low-NO(subscript x) pulverized coal (P.C.) combustion. The research project is intended to advance PETC's efforts to improve our technical understanding of the high-temperature chemical and physical processes involved in the utilization of coal. The work focuses on the mechanistic description and rate quantification of the effects of fuel properties and combustion environment on the oxidation of iron pyrite to form the non-slagging species magnetite. The knowledge gained from this work is intended to be incorporated into numerical codes that can be used to formulate anti-slagging strategies involving minimal disturbance of coal combustor performance.
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