DOI: 10.52150/2522-9117-2022-36-109-122

Tsiupa Natalia Oleksandrivna, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, Ukraine, 49107. ORCID: 0000-0003-0682-461X. E-mail: tysya6669@gmail.com

Stepanenko Dmytro Oleksandrovych, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, Ukraine, 49107. ORCID: 0000-0001-5913-2284

Snihura Iryna Romanivna, Ph. D. (Tech.), Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, Ukraine, 49107. ORCID: 0000-0001-5872-7403

RESEARCH OF THE REGULATIONS OF INFLUENCE OF ALKALI COMPOUNDS ON THE FIREPROOF LINING OF THE BLAST FURNACE IN THE CONDITIONS OF USING SECONDARY RESOURCES

Summary. The main task of the work is to identify the regularities of the influence of alkaline compounds on the destruction of the refractory lining, to obtain a quantitative characteristic of the influence of the chemical composition of the blast furnace slag and the temperature and thermal conditions of the furnace on the adsorption of alkaline compounds by the slag in order to timely change the composition of the charge materials and the essential conditions of the furnace in order to maximum removal of alkaline compounds and neutralization of their negative impact on the lining under the conditions of using secondary resources in charge materials. The research methods are physico-chemical modeling and correlation-regression analysis. The mechanism of corrosion activity of blast furnace slags in relation to blast furnace refractory masonry was studied, and it was shown that the corrosion activity of slag melts in relation to refractories is determined by their properties: viscosity, wettability, surface tension. At the same time, the role of viscosity is decisive. In the work, it was established that with an increase in the content of alkali metal oxides in the slag, the constant of impregnation of the refractory with slag increases, and therefore, its wear increases and, as a result, its service life decreases. Potassium and sodium oxides contained in the primary slag have the greatest influence on the wear of the blast furnace lining, as their content in it can reach up to 10%. As the temperature increases and the chemical composition of the slag changes, the content of potassium and sodium oxides decreases, and therefore their influence on the wear of the liner becomes insignificant. Therefore, the removal of alkaline compounds from the blast furnace with the final slag, and therefore an increase in their content in it, will not lead to a significant increase in the wear of refractories in the furnace area. On the basis of the conducted studies, it was established that the corrosive activity of slags in relation to refractories due to the chemical composition and properties of slag melts can be assessed using the criterion of corrosion resistance of refractories to slag melts, which is chosen as the rate constant of refractories impregnation with slag. The criterion of corrosion resistance of refractories makes it possible to choose a refractory material for different zones of the furnace depending on the temperature conditions of its operation and the slag regime, as well as to evaluate the effect of the chemical composition of the slag, in particular oxides of alkali metals, on the resistance of refractories.

Key words: alkaline aggression, blast furnace lining, secondary resources, physical and chemical properties, slag corrosion.

DOI: https://doi.org/10.52150/2522-9117-2022-36-109-122

For citation: Tsiupa N. О., Stepanenko D. О., Snihura I. R. Doslidzhennia zakonomirnostei vplyvu luzhnykh spoluk na vohnetryvku futerivku domennoi pechi v umovakh vykorystannia vtorynnykh resursiv [Research of the regulations of influence of alkali compounds on the fireproof lining of the blast furnace in the conditions of using secondary resources]. Fundamental and applied problems of ferrous metallurgy. 2022. Collection 36. P. 109-122. [In Ukrainian]. https://doi.org/10.52150/2522-9117-2022-36-109-122

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