Influence of the granular component type and the ratio of batch components on the properties of pressed alumina-chromia-zirconia-silica refractories with a mass fraction of 60 % Cr2O3

  • Yu. Ye. Mishnyova JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
  • I. G. Shulyk JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
  • K. I. Kushchenko JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
  • P. O. Kushchenko JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
  • Yu. O. Krakhmal JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
Keywords: alumina-chromia-zirconia-silica refractories containing 60 % Cr2O3, batch, filler, semi-dry pressing, properties

Abstract

Investigations on the influence of granular component type and ratio of batch components on the properties of pressed alumina-chromia-zirconiasilica refractories with a content of 60 % Cr2O3 have been carried out.

The optimal composition of batch, which includes scrap bakor products, scrap chromia products, alumina and metallurgical chromium oxide, was established.

This composition provides, after firing in an oxidizing atmosphere, obtaining refractory samples with an open porosity of 23.1 %, an apparent density of 3.52 g/cm3, cold crushing strength 120 N/mm2, thermal shockresistance 950 °C — water 5 thermal cycles.It was shown that, the introduction of granular tabular alumina intothe batch composition (instead of granular fused white alumina) leads to adecrease in the open porosity of samples, although to a lesser extent thanwith the introduction of scrap bakor products.It was established that, for samples containing 60 % metallurgicalchromium oxide, the introduction of scrap bakor products instead of fusedwhite alumina does not lead to a significant decrease in their open porosity.

It was shown that, firing in a reducing atmosphere and titanium oxide addition do not significantly affect the increase in apparent density and cold crushing strength of the studied samples.

Comparative studies of the corrosion resistance of alumina-chromiazirconia-silica refractories containing 60 % Cr2O3 of different composition to melts of E glass and basalt have found that, E glass and basalt impregnate refractories, and under the influence of glass, some samples were slightly corroded. The samples of developed optimal composition were less impregnated than samples of other compositions and were not corroded by E glass and basalt, which makes it possible to predict an increase in the stability of these refractories in service in glass furnaces for the production of glass fiber from E glass and basalt.

As a result of the carried out research, the technology of aluminachromia-zirconia-silica refractories with a content of 60 % Cr2O3 has been improved.

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Published
2021-12-30
How to Cite
Mishnyova, Y. Y., Shulyk, I. G., Kushchenko, K. I., Kushchenko, P. O., & Krakhmal, Y. O. (2021). Influence of the granular component type and the ratio of batch components on the properties of pressed alumina-chromia-zirconia-silica refractories with a mass fraction of 60 % Cr2O3. Scientific Research on Refractories and Technical Ceramics, 121, 11-22. https://doi.org/10.35857/2663-3566.121.02

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