Теорія і практика металургії (ДМетІ)

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http://crust.ust.edu.ua/handle/123456789/14518
ENG: Theory and practice of metallurgy, Institute of Industrial and Business Technologies (DMetI)

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Browsing Теорія і практика металургії (ДМетІ) by Author "Jiang, Zhouhua"

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    Physico-Chemical Justification and Experimental Verification of a Waste-Free Method of Oxidative Dephosphorization of a High-Phosphorus Manganese Alloy
    (National Metallurgical Academy of Ukraine, Ukrainian State University of Science and Technologies, Dnipro, 2024) Kamkina, Liudmyla V.; Velychko, K. A.; Velychko, A. G.; Jiang, Zhouhua
    ENG: The purpose of the study: physicochemical justification of the process conditions and development of a rational algorithm for a single-stage waste-free method of oxidative dephosphorization of a high-phosphorus manganese alloy. Methods: thermodynamic analysis of the main reactions during oxidative refining of manganese alloys with a high phosphorus content. Experimental verification of the main stages of refining. Results: The physicochemical essence of the refining process of a high-phosphorus manganese alloy, which consists in creating conditions for oxidation in the alloy of manganese, carbon and silicon, is considered. The thermodynamic forecast of the course of reactions under the given conditions of oxidative refining of the associated metal confirms the possibility of obtaining three products: low-phosphorus manganese slag, ferric melt and phosphorus-containing slag with a phosphorus oxide content of 18-20% (phosphorus fertilizer). Scientific novelty: Based on the results of high-temperature mathematical modeling, it was established that the most rational oxygen consumption, which ensures the achievement of the tasks, is ~ 13 m3. As an oxidant, it is advisable to use oxygen blown by air, which is introduced into the converter bath using an inflatable nozzle from above. In this case, the total air consumption per 100 kg of alloy should be about 50 m3. Practical value: In the work, based on the thermodynamic forecast of the behavior of the elements of the accompanying alloy in oxidizing conditions, assessment of the thermal side of the process and further experimental verification, results were obtained that confirm the possibility of creating a waste-free technological scheme for refining a high-phosphorus alloy. In this case, it is advisable to carry out the refining of the alloy in conditions close to the conditions of modern production of low-phosphorus manganese slag, in which the temperature of the accompanying alloy is 1320...1350°C.
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    Vibration Characteristics and Dynamic Control of Vacuum Treatment
    (National Metallurgical Academy of Ukraine, Ukrainian State University of Science and Technologies, Dnipro, 2023) Velychko, A. G.; Sukhyi, Kostyantyn M.; Jiang, Zhouhua
    ENG: Vibration characteristics of vacuum treatment at industrial steel vacuumisation units are studied. The amplitudefrequency spectrum and the main sources of vibration of vacuum treatment units are analysed. It is shown that the vibration spectrum is dominated by low and high frequency ranges. In the low-frequency range the vibration of vacuum treatment units is connected with bath oscillations and wave formation on the surface, as well as with decarburisation of metal during oxygen blowing and vacuum-carbon deoxidation and degassing processes. In the high-frequency region the sources of vibration are pulsations of vented gases. Correlation relations between vibration and technological parameters of vacuum treatment are established. Possibilities of vibration method for dynamic control of vacuum treatment are shown. The character of vibration signal level change at the frequency of 8 Hz reflects the dynamics of decarburisation during oxygen blowing of metal at reduced pressure. In the established frequency ranges the vibration characteristics allow to control the processes of vacuum-carbon deoxidation and degassing.