Registration Number
0220U100235,
0119U102381
, R & D reports
Title
Minimization of destructive influence of alkali compounds on refractory lining of blast furnace in conditions of use of secondary resources
popup.stage_title
Head
Tsyupa Natalia O., Кандидат технічних наук
Registration Date
14-01-2020
Organization
Iron and Steel Institute of Z.I.Nekrasov National Academy of Sciences of Ukraine
popup.description2
Based on the calculations, the rate constants of impregnation of the refractory for primary, intermediate, final slags and refractories located in the area of the mine, lower inwall, bosh, tuyeres and hearth at temperatures of 1150-1500 °C, it is shown that each 1% of alkali metal oxides in the slag increases the refractory impregnation rate constant by 7% on average, while increasing the temperature of the slag by 10 °C leads to an increase in the impregnation constant of the refractory by 12%. Thus, the influence of alkaline compounds on the corrosion value of refractory of slag will be highest in primary slag, where the content of alkali metal oxides can be more than 10%, which will lead to an increase in the rate constant of impregnation of the refractory by 70%, i.e. almost twice. With increasing temperature and changes in the chemical composition of the slag, the content of potassium and sodium oxides decreases, therefore, their effect on the wear of the lining becomes insignificant. Therefore, the removal of alkaline compounds from the blast furnace with the final slag, and hence the increase in their content in it, will not lead to a significant increase in the wear of refractories in the hearth zone.
It was found that the corrosive activity of slags with respect to refractories, due to the chemical composition and properties of slag melts, can be estimated using the criterion of corrosion resistance of refractories to slag melts, for which the rate constant of impregnation of the refractory of slag. The corrosion resistance criterion for refractories allows the selection of refractory material for various zones of the furnace depending on the temperature conditions of its operation and slag regime, as well as assessing the influence of the chemical composition of slag, in particular alkali metal oxides, on the stability of refractories.
Product Description
popup.authors
Skachko Oleksandr S.
Snihura Iryna R.
Stepanenko Dmytro O.
popup.nrat_date
2020-04-02
