Residues from coal conversion and utilization: Advanced mineralogical characterization and disposed byproduct diagenesis. [Semiannual report, 1 Mar 1999--31 Aug 1999]

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The goal of the project is to learn more about the phenomenon of coal conversion byproduct (CCB) diagenesis, first described by this group and co-workers at UND EERC seven years ago. CCB diagenesis is a change in the mineralogy that occurs after some CCBs are disposed in a landfill or utilized for a civil engineering application. Regulatory environmental tests and civil engineering tests are typically performed on as-generated CCBs, or on CCBs hydrated and cured for relatively short periods such as 7 or 28 days. One would like to know whether the results of these short-term tests will be valid ... continued below

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5 pages

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McCarthy, Gregory J. & Grier, Dean G. January 1, 2000.

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Description

The goal of the project is to learn more about the phenomenon of coal conversion byproduct (CCB) diagenesis, first described by this group and co-workers at UND EERC seven years ago. CCB diagenesis is a change in the mineralogy that occurs after some CCBs are disposed in a landfill or utilized for a civil engineering application. Regulatory environmental tests and civil engineering tests are typically performed on as-generated CCBs, or on CCBs hydrated and cured for relatively short periods such as 7 or 28 days. One would like to know whether the results of these short-term tests will be valid years later. A change in mineralogy means a gain, loss or chemical redistribution of major, minor and trace elements, and alteration of physical properties. To attain this goal, two objectives were defined: (1) to develop improved methodology for quantitating mineralogy of these complex crystalline phase assemblages, and (2) to investigate the phenomenon of CCB diagenesis further by studying materials recovered from disposal landfills or civil engineering works. Objective 1--Hydrated CCBs are chemically and mineralogically complex, which makes quantitative mineralogy determination by conventional X-ray diffraction unusable or unreliable. The whole-pattern Rietveld quantitative X-ray diffraction (RQXRD) method, however, can overcome many of the problems and seems well suited to improve reliability. Two tasks were defined in the proposal: Task 1--Completion by October 1997. Prepare a reference set of CCBs for use in developing Rietveld QXRD. The reference materials will come primarily from in-house samples of advanced coal technology byproducts. The work will include SEM/EMPA characterization at UND EERC. Task 2--Completion by October 1997. Develop protocols for Rietveld QXRD analysis of CCBs. Make CCB structure data and protocols available on a Website. Determine levels of sensitivity, precision, and accuracy. Objective 2--Five types of CCBs disposed in landfills were studied between 1989 and 1994. Diagenesis was observed in three of the five materials. To obtain a more generic understanding of CCB diagenesis, additional materials and different environmental settings need to be studied. Task 3--Completion by end of project. Apply RQXRD protocols developed in Task 2 to core samples of utilized or disposed CCBs from at least five additional sites. Use results to gain a better understanding of CCB diagenesis.

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5 pages

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OSTI as DE00758847

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  • Other Information: PBD: 1 Jan 2000

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  • Report No.: DE--FG22-96PC96207-06
  • Grant Number: FG22-96PC96207
  • DOI: 10.2172/758847 | External Link
  • Office of Scientific & Technical Information Report Number: 758847
  • Archival Resource Key: ark:/67531/metadc709569

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 8, 2016, 1:36 p.m.

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McCarthy, Gregory J. & Grier, Dean G. Residues from coal conversion and utilization: Advanced mineralogical characterization and disposed byproduct diagenesis. [Semiannual report, 1 Mar 1999--31 Aug 1999], report, January 1, 2000; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc709569/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.