Випаровування та розчинення магнію в рухомих бульбашках
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Date
2025
Journal Title
Journal ISSN
Volume Title
Publisher
ДДТУ, Кам’янське
Abstract
UKR: У роботі наводяться результати дослідження кінетики процесу десульфурації за участю частинок магнію. Виконано математичний опис руху бульбашки з урахуванням її радіусу, коефіцієнту поверхневого натягу, густини рідкого металу, густини газу, гідравлічного тиску та умов масопереносу в розплаві. Наведено результати розрахунків для варіантів, де показані криві підйому бульбашок із частинкою магнію радіусом 1 мм. З’ясовано, що процес випаровування залежить від концентрації магнію в глибині металу. Виконано оцінку маси пари в бульбашці та зміни радіуса бульбашки під час підйому. Показано, що швидке випаровування магнію призводить до збільшення радіусів бульбашок, які спливають, та їхнє швидке схлопування пов'язане з розчиненням парів у рідкому металі. Представлена кінетична модель показує фізико-хімічний перебіг процесу надходження магнію з бульбашок у розплавлений метал під час обробки чавуну зернистим магнієм. Отримані результати розрахунків мають практичну цінність при освоєнні технології в промислових умовах.
ENG: Desulphurization of cast iron can be performed using various reagents. For each reagent, it is important to know the physical picture of the interaction of particles with molten metal. To ensure the stable operation of the chosen technology, kinetic issues of desulphurization involving particles are of great interest. With the further development of technological methods for desulphurization of cast iron and their improvement, new issues arise that require theoretical analysis and numerical estimates of both the entire process and its details. The aim of this work is to study the kinetics of the desulphurization process involving magnesium particles. The problem was formulated to mathematically describe the bubble motion taking into account the bubble radius, surface tension coefficient, liquid metal density, gas density, hydraulic pressure, and mass transfer conditions in the melt. The results of calculations for the variants showing the curves of bubble rise with a magnesium particle with a radius of 1 mm are presented. It is shown that the vaporization process depends on the boundary condition, i.e., on the concentration of magnesium in the depth of the metal. The mass of vapor in the bubble and the change in the bubble radius during the ascent were estimated. The calculations have shown the dynamics of formation and behavior of relatively small bubbles of a mixture of carrier gas and magnesium vapor moving in molten iron. It is shown that rapid evaporation of magnesium, which leads to an increase in the radii of the bubbles that pop up, as well as their rapid collapse, is associated with the dissolution of vapors in liquid metal. This behavior is typical for the initial stage of the desulfurization process, when the concentration of magnesium in the metal is almost zero. For the case of a relatively high concentration (the final stage of the process), the effect of returning dissolved magnesium to the bubble is possible, because the partial pressure of magnesium vapor in the bubble may be lower than the required value. This interesting feature is related to both the concentration of magnesium vapor in the bubble itself and the conditions in the liquid metal. Thus, the presented kinetic model shows the physicochemical course of the process of magnesium flow from bubbles into molten metal during the treatment of cast iron with granular magnesium. The obtained calculation results are of practical value for the development of the technology in industrial conditions.
ENG: Desulphurization of cast iron can be performed using various reagents. For each reagent, it is important to know the physical picture of the interaction of particles with molten metal. To ensure the stable operation of the chosen technology, kinetic issues of desulphurization involving particles are of great interest. With the further development of technological methods for desulphurization of cast iron and their improvement, new issues arise that require theoretical analysis and numerical estimates of both the entire process and its details. The aim of this work is to study the kinetics of the desulphurization process involving magnesium particles. The problem was formulated to mathematically describe the bubble motion taking into account the bubble radius, surface tension coefficient, liquid metal density, gas density, hydraulic pressure, and mass transfer conditions in the melt. The results of calculations for the variants showing the curves of bubble rise with a magnesium particle with a radius of 1 mm are presented. It is shown that the vaporization process depends on the boundary condition, i.e., on the concentration of magnesium in the depth of the metal. The mass of vapor in the bubble and the change in the bubble radius during the ascent were estimated. The calculations have shown the dynamics of formation and behavior of relatively small bubbles of a mixture of carrier gas and magnesium vapor moving in molten iron. It is shown that rapid evaporation of magnesium, which leads to an increase in the radii of the bubbles that pop up, as well as their rapid collapse, is associated with the dissolution of vapors in liquid metal. This behavior is typical for the initial stage of the desulfurization process, when the concentration of magnesium in the metal is almost zero. For the case of a relatively high concentration (the final stage of the process), the effect of returning dissolved magnesium to the bubble is possible, because the partial pressure of magnesium vapor in the bubble may be lower than the required value. This interesting feature is related to both the concentration of magnesium vapor in the bubble itself and the conditions in the liquid metal. Thus, the presented kinetic model shows the physicochemical course of the process of magnesium flow from bubbles into molten metal during the treatment of cast iron with granular magnesium. The obtained calculation results are of practical value for the development of the technology in industrial conditions.
Description
В. Єлисєєв: ORCID 0000-0003-4999-8142; І. Маначин: ORCID 0000-0001-9795-6751; В. Кисляков: ORCID 0000-0002-1775-5050; ; О. Руденко: ORCID 000-0001-6068-9901; ; О. Чубіна: ORCID 0000-0003-2213-5013
Keywords
рафінування чавуну, магній, бульбашка, кінетика, модель, cast iron refining, magnesium, bubble, kinetics, model, КАВП
Citation
Єлисєєв В. І., Маначин І. О., Кисляков В. Г., Руденко О. Л., Чубіна О. А. Випаровування та розчинення магнію в рухомих бульбашках. Збірник наукових праць Дніпровського державного технічного університету (технічні науки). 2025. Т. 1, № 46. С. 9–18. DOI: https://doi.org/10.31319/2519-2884.46.2025.1.