Browsing by Author "Semenov, Yurii"

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    Development of Stabilization Measures Aimed at Removing Zinc with Smelting Products and Accumulating Titanium in the Hearth of a Blast Furnace
    (John Wiley & Sons, Ltd., 2024) Semenov, Yurii; Horupakha, Viktor; Vashchenko, Serhii; Khudyakov, Oleksandr; Shumelchyk, Ievhen; Baiul, Kostiantyn V.
    ENG: This paper presents the results of the development of stabilization measures aimed at the removal of zinc with the products of melting and accumulation of titanium in the hearth of a blast furnace. The relevance of the development and use in practice of such measures is due to the unstable fuel and raw materials conditions for the production of cast iron, when their stabilization is a complex and difficult task, as well as the need to extend the campaign of blast furnaces during the overhaul period. The negative effect of zinc oxides on the condition of the blast furnace shaft lining, accompanied by slab formation, and the overconsumption of specific coke consumption, which occurs when zinc circulates in the volume of the blast furnace, require measures to remove zinc from the smelting products. The article proposes such measures, which consist of flushing according to the proposed schedule during the operation of the blast furnace at planned blowing parameters and with the provision of the necessary thermal reserve. In order to lengthen the campaign of a blast furnace, one of the most common methods for protecting the hearth lining is the periodic introduction of titanium-containing materials into the charge of blast furnaces. The entry of titanium oxides into the furnace, as a rule, is ensured by the use of concentrate or specially prepared ilmenite briquettes with a high titanium content as part of the sinter charge, which can be introduced directly into the composition of the blast furnace charge. The article analyzes the experience of using titanium-containing materials as part of a blast furnace charge and formulates measures to intensify skull formation in the hearth.
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    Optimization of Briquetting Technology of Fine-Grained Metallurgical Materials Based on Statistical Models of Compressibility
    (Elsevier, Netherlands, 2022) Khudyakov, Alexander; Vashchenko, Sergii; Baiul, Kostiantyn V.; Semenov, Yurii; Krot, Pavlo
    ENG: This paper represents the study of the briquetting process optimization of metallurgical charges. A new measure of briquettes’ quality – the compression intensity factor, is developed. Using the design of experiments, the nonlinear relationships are established of given factors: the content of plasticizer and moisture, hardness of the particles, dynamic viscosity of the liquid binder, amount of carbonaceous component and the average particle size in the charge. The adequateness of the models was estimated. It is shown that the greatest influence on compressibility has the hardness of the particles while the dynamic viscosity of the liquid binder has a minimum effect. An effective way to control the briquetting process is to change the content of the plasticizer and moisture. In the case of iron carbon mixtures, it is necessary to control simultaneously the content of carbonaceous material and the particle size of both components. The article provides detailed recommendations on results implementation.