Kaolin refractories for the lining of the iron notch of a 5000-m3 blast furnace

Autor: R. E. Shcherbina, B. N. Starshinov, V. Ka. Zima, R. M. Fedoruk, G. A. Belokrys, T. P. Khmelenko, R. S. Shulyak, I. P. Davydov, N. V. Pitak
Rok vydání: 1976
Předmět:
Zdroj: Refractories. 17:404-410
ISSN: 1573-9139
0034-3102
Popis: The formation of the black core in large kaolin bricks during the firing process is caused mainly by the reducing medium which develops in the central part of these high-density refractories, graphitizes the carbon, and converts some of the high-valence iron and titanium oxides to low-valence oxides. The principal sources of the reducing medium inside the brick are the spent sulfite liquor and the sulfur- and carbon-containing impurities of the starting material. The likelihood of a black core being formed increases with the density of the green product and the rate at which the kiln temperature is raised. The properties of the light-colored outer and black inner zones are dissimilar so that cracks are formed during heating and cooling. In a joint project with the Zaporozhe Refractories Plant the Ukrainian Scientific-Research Institute for Refractories developed a method of producing high-density kaolin brick without black core. The method was used to produce about 200 tons of bricks measuring 345×150×150 mm and 230×150 ×150 mm for the lining of the iron notches of the 5000-m3 No. 9 blast furnace of the Krivoi Rog Metallurgical Plant.
Databáze: OpenAIRE
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