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Effeet of Al2O3, MgO and SiO2 on Sintering and Hydration Behaviors of CaO Ceramics

  • Published : 2002.06.01

Abstract

CaO ceramics were prepared by conventional sintering process and their hydration behaviors were evaluated by measuring weight increment on saturated water vapor pressure at ambient temperature. CaCO$_3$ and limestone were used as CaO source materials and $Al_2$O$_3$, MgO and SiO$_2$ were added as sintering agents. $Al_2$O$_3$ was a liquid phase sintering agent to increase densification and grain growth rates, whereas MgO and SiO$_2$, densification and grain growth inhibitors. Regardless of composition, all of the prepared CaO ceramics showed the improved hydration resistance as bulk density increased. Especially, when bulk density was more than 3.0 g/㎤, there was no weight increment after 120 h of hydration. Therefore, to decrease contact area between CaO and water vapor by increasing bulk density with the $Al_2$O$_3$ sintering additive was effective for the improvement of CaO hydration resistance.

Keywords

CaO;Conventional sintering;Hydration behavior;$Al_2$$O_3$;Bulk density

References

  1. J. Am. Ceram. Soc. v.67 no.6 Reactive-phase Calsintering of Calcium-carbonate-derived Lime Y.Y. Shi;G.L. Messing;R. C. Bradt
  2. J. Am. Ceram. Soc. v.78 no.6 Lime Refractories with Limestone and Synthetic Calcium Hydroxide Additions L. L. Wong;R. C. Bradt https://doi.org/10.1111/j.1151-2916.1995.tb08859.x
  3. J. Am. Ceram. Soc. v.52 no.8 CaO: Ⅱ. Properties R. W. Rice https://doi.org/10.1111/j.1151-2916.1969.tb11973.x
  4. J. Am. Ceram. Soc. v.62 no.11-12 The Nature of CaO Produced by Calcite Powder Decomposition in Vacuum and in CO₂ J. Ewing;D. Beruto;A. W. Searcy https://doi.org/10.1111/j.1151-2916.1979.tb12736.x
  5. J. Am. Ceram. Soc. v.53 no.8 CaO: I. Fabrication and Characterization R. W. Rice
  6. British Ceramic Transactions v.93 no.4 Improvements in Hydration Resistance of CaO Clinkers L. Xintian;H. Tiecui
  7. CRC Handbook of Chemistry and Physics D. R. Lide
  8. Ceram. Bull. v.49 no.5 Increasing Hydration Resistance of Calcia I. B. Cutler;R. L. Felix;L. P. Caywood, Jr.
  9. Ceram. Bull. v.48 no.6 Some Properties of Lime Refractories D. H. Hubble
  10. US Patent, 4383044 Slaking-resistant Calcia Refractory Nagayama;Hiroshi
  11. Ceram. Bull. v.50 no.6 A Lime Refractory for High Temperature Use J. T. Benson;O. J. Whittemore, Jr.
  12. J. Am. Ceram. Soc. v.63 no.7-8 Characterization of the Porous CaO Particles Formed by Decomposition of CaCO₃and Ca(OH)₂in Vacuum D. Beruto;L. Barco;A.W. Searcy;G. Spinolo https://doi.org/10.1111/j.1151-2916.1980.tb10208.x
  13. J. Kor. Ceram. Soc. v.32 no.5 Densification and Enhancement of the Hydration Resistance of CaO with Aluminum(in Kor.) Y. G. Lee;C. G. Lee;B. S. Jun
  14. Ceram. Bull v.49 no.2 Preparation of Lime Specimens with Closely Controlled Properties W. J. Schlitt;G.W. Healy
  15. Ceram. Bull. v.43 no.1 Fabrication of High Density Calcium Oxide Ceramics M. A. Hepworth;J. Rutherford
  16. A Study on the Effect of the Surface Carbonation on the Hydration of CaO H. S. Song
  17. J. Am. Ceram. Soc. v.64 no.2 Vapor Phase Hydration of Submicrometer CaO Particles D. Beruto;L. Barco;G. Belleri;A. W. Searcy https://doi.org/10.1111/j.1151-2916.1981.tb09579.x
  18. Taikabutsu Overseas v.11 no.3 CaO Clinker with Improved Anti-hydration Property F. Kawano;I. Yamoto;J. Nomura;J. Yoshitomi;A. Ikesue;H. Shikano
  19. US Patent, 3026211 Calcium Oxide Refractory and Process of Producing the Same I. B. Cutler