Fly ash carbon passivation
Abstract
A thermal method to passivate the carbon and/or other components in fly ash significantly decreases adsorption. The passivated carbon remains in the fly ash. Heating the fly ash to about 500 and 800 degrees C. under inert gas conditions sharply decreases the amount of surfactant adsorbed by the fly ash recovered after thermal treatment despite the fact that the carbon content remains in the fly ash. Using oxygen and inert gas mixtures, the present invention shows that a thermal treatment to about 500 degrees C. also sharply decreases the surfactant adsorption of the recovered fly ash even though most of the carbon remains intact. Also, thermal treatment to about 800 degrees C. under these same oxidative conditions shows a sharp decrease in surfactant adsorption of the recovered fly ash due to the fact that the carbon has been removed. This experiment simulates the various "carbon burnout" methods and is not a claim in this method. The present invention provides a thermal method of deactivating high carbon fly ash toward adsorption of AEAs while retaining the fly ash carbon. The fly ash can be used, for example, as a partial Portland cement replacement in air-entrained concrete, in conductive and other concretes,more »
- Inventors:
- Issue Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1128491
- Patent Number(s):
- 8440015
- Application Number:
- 12/803,306
- Assignee:
- Waynesburg University (Waynesburg, PA); U.S. Department of Energy (Washington, DC)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02W - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
La Count, Robert B, Baltrus, John P, and Kern, Douglas G. Fly ash carbon passivation. United States: N. p., 2013.
Web.
La Count, Robert B, Baltrus, John P, & Kern, Douglas G. Fly ash carbon passivation. United States.
La Count, Robert B, Baltrus, John P, and Kern, Douglas G. Tue .
"Fly ash carbon passivation". United States. https://www.osti.gov/servlets/purl/1128491.
@article{osti_1128491,
title = {Fly ash carbon passivation},
author = {La Count, Robert B and Baltrus, John P and Kern, Douglas G},
abstractNote = {A thermal method to passivate the carbon and/or other components in fly ash significantly decreases adsorption. The passivated carbon remains in the fly ash. Heating the fly ash to about 500 and 800 degrees C. under inert gas conditions sharply decreases the amount of surfactant adsorbed by the fly ash recovered after thermal treatment despite the fact that the carbon content remains in the fly ash. Using oxygen and inert gas mixtures, the present invention shows that a thermal treatment to about 500 degrees C. also sharply decreases the surfactant adsorption of the recovered fly ash even though most of the carbon remains intact. Also, thermal treatment to about 800 degrees C. under these same oxidative conditions shows a sharp decrease in surfactant adsorption of the recovered fly ash due to the fact that the carbon has been removed. This experiment simulates the various "carbon burnout" methods and is not a claim in this method. The present invention provides a thermal method of deactivating high carbon fly ash toward adsorption of AEAs while retaining the fly ash carbon. The fly ash can be used, for example, as a partial Portland cement replacement in air-entrained concrete, in conductive and other concretes, and for other applications.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 14 00:00:00 EDT 2013},
month = {Tue May 14 00:00:00 EDT 2013}
}
Works referenced in this record:
Determination of the distribution of molybdenum oxidation states in reduced Mo/TiO2 catalysts by factor analysis and curve fitting
journal, January 1993
- Fiedor, Joseph N.; Proctor, Andrew; Houalla, Marwan
- Surface and Interface Analysis, Vol. 20, Issue 1
Investigation of fly ash carbon by thermal analysis and optical microscopy
journal, October 1998
- Hill, R.; Rathbone, R.; Hower, J. C.
- Cement and Concrete Research, Vol. 28, Issue 10
Fly ash treatment by in situ ozone generation
patent, May 2002
- Altman, Ralph F.
- US Patent Document 6,395,145
Adsorptive and Optical Properties of Fly Ash from Coal and Petroleum Coke Co-firing
journal, March 2000
- Yu, J.; Külaots, I.; Sabanegh, N.
- Energy & Fuels, Vol. 14, Issue 3
Study of the reduction behavior of W/TiO2 catalysts by XPS using curve fitting, deconvolution and factor analysis
journal, April 1995
- Fiedor, Joseph N.; Proctor, Andrew; Houalla, Marwan
- Surface and Interface Analysis, Vol. 23, Issue 4
Method of fly ash beneficiation and apparatus for same
patent, March 1995
- Cochran, Joe; Kirkconnell, S. Frank
- US Patent Document 5,399,194
Ozonation for the chemical modification of carbon surfaces in fly ash
journal, April 2001
- Gao, Y.; Külaots, I.; Chen, X.
- Fuel, Vol. 80, Issue 5
Interactions of carbon-containing fly ash with commercial air-entraining admixtures for concrete
journal, June 1997
- Freeman, Elizabeth; Gao, Yu-Ming; Hurt, Robert
- Fuel, Vol. 76, Issue 8
Characterization of Carbon Concentrates from Coal-Combustion Fly Ash
journal, February 2001
- Baltrus, John P.; Wells, Arthur W.; Fauth, Daniel J.
- Energy & Fuels, Vol. 15, Issue 2
Enhancement of cement clinker yield
patent, May 2002
- Oates, David Bridson; Cail, Kevin; Lehoux, Paul
- US Patent Document 6,391,105
Effects of Carbon on Air Entrainment in Fly Ash Concrete: The Role of Soot and Carbon Black
journal, March 1997
- Gao, Yu-Ming; Shim, Hong-Shig; Hurt, Robert H.
- Energy & Fuels, Vol. 11, Issue 2
Method of controlling air entrainment in concrete compositions
patent, August 1990
- Arfaei, Ahmad
- US Patent Document 4,948,429
Method and product of fly ash benefication by carbon burnout in a dry bubbling fluid bed
patent, November 1992
- Cochran, Joseph W.
- US Patent Document 5,160,539
Apparatus and method for deactivating carbon in fly ash
patent, October 2000
- Hurt, Robert H.; Suuberg, Eric M.; Gao, Yuguang
- US Patent Document 6,136,089
Measurement of adsorption of air-entraining admixture on fly ash in concrete and cement
journal, May 2001
- Baltrus, John P.; LaCount, Robert B.
- Cement and Concrete Research, Vol. 31, Issue 5