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Storage Alternatives for High-Calcium Fly Ashes

  • Carol L. Kilgour (a1), Kenneth L. Bergeson (a1) and Scott Schlorholtz (a1)

Abstract

One of the major problems currently restricting the utilization of high-calcium (ASTM Class C) fly ashes in Iowa is lack of adequate storage space. High-calcium fly ashes are self-cementitious and are generally not economically reclaimable once they have been exposed to water (i.e., the environment). Since the on-site silo storage capacity of a given power plant is normally only about one or two weeks of overall generating capacity (assuming nearly full load), the fly ash industry is hard-pressed to meet the demand for fly ash during the peak construction months.

This paper presents some early research findings concerning the storage alternatives available for these high-calcium fly ashes. A simple pan agglomerator, requiring only the addition of a water spray was used to produce fly ash pellets. Since the method required minimal energy input the process would be expected to be economically feasible for field production. Laboratory produced pellets appeared strong and durable and would be expected to withstand field handling without significant degradation. The pelletization process did not appear to result in a loss of reactivity for either the air-dried or water-cured pellets. This is highly important for potential use in Portland cement concrete or soil stabilization.

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1. Hall, J.S., Hannaford, C.S., Cashion, J.D., Brown, L.J., Ottrey, A.L. and Tang, D., in Agglomeration 1985: 4th Int. Symp., edited by Capes, C.E., Toronto 1985, pp. 945953.
2. Fuerstenau, D.W. and Abouzeid, A.Z.M. in Agglomeration 1982: 3rd Int. Symrp., Vol 2, 1981, Nurnburg, pp. H2–H18.
3. Furstenau, D.W. and Malhotra, V.P., in Bureau of Mines Open Report 89–83 June 1983.
4. Schlorholtz, S., Bergeson, K. and Demirel, T., in Fly Ash and Coal Conversion By-Products: Characterization. Utilization and Disposal III, Mat. Res. Soc. Symp. Proc. Vol 86, edited by McCarthy, G.J., Glasser, F.P., Roy, D.M. and Diamond, S. (Materials Research Society, Pittsburgh, 1987) pp. 325336.
5. Schlorholtz, S., Bergeson, K. and Demirel, T. in Fly Ash and Coal Conversion By-Products: Characterization, Utilization and Disposal III, Mat. Res. Soc. Symp. Proc. Vol 86, edited by McCarthy, G.J., Glasser, F.P., Roy, D.M. and Diamond, S. (Materials Research Society, Pittsburgh, 1987) pp. 337342.
6. Schlorholtz, S., Bergeson, K. and Demirel, T. in Fly Ash and Coal Conversion By-Products: Characterization. Utilization and Disposal III, Mat Res Soc. Symp. Proc. Vol 86, edited by McCarthy, G.J., Glasser, F.P., Roy, D.M. and Hemmings, R.T. (Materials Research Society Pittsburgh, 1988) pp. 107116.
7. Burnett, G. and Gokhale, A.J., in Proc. 4th Int. Ash Util. Symp., Volume 2, 1987 pp. 61–1 to 61–17.

Storage Alternatives for High-Calcium Fly Ashes

  • Carol L. Kilgour (a1), Kenneth L. Bergeson (a1) and Scott Schlorholtz (a1)

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