Application of the Mining Industry Wastes as Raw Material for Melting of the Complex Fesial Ferroalloys

• Autorzy: Machulec B. , Bialik W. , Gil S.

Identyfikatory

DOI

10.24425/122430

• Języki publikacji: EN

Abstrakty

EN

An economical alternative for the steel industry which uses a separate ferrosilicon and aluminum for the deoxidization of steel is a complex deoxidizer in the form of FeSiAl alloys. The effectiveness of complex deoxidizers is higher and they have a positive effect on quality improvement and also for mechanical properties of the finished steel. It is associated with a smaller number of non-metallic inclusions and a more favorable its distribution in the structure of steel. Noteworthy are the waste from the mining industry simultaneously contains SiO₂ and Al₂ O₃ oxides with a few of dopants in the form of CaO, MgO, FeO, TiO₂ oxides. These wastes are present in large quantities and can be a cheap raw material for obtaining complex FeSiAl ferroalloys by an electrothermal method. “Poor” hard coal grades which so far did not apply as a reducing agent in the ferroalloy industry because of the high ash content can also be a raw material for the electrothermal FeSiAl process. The electrothermal FeSiAl melting process is similar to the ferrosilicon process in the submerged arc furnace. For this reason, a model based on Gibbs’ free enthalpy minimization algorithm was used to analyze the simultaneous reduction of SiO₂ and Al₂ O₃ oxides, which was originally elaborated for the ferrosilicon smelting process. This is a system of two closed reactors: the upper one with the lower temperature and the lower one with the higher temperature. Between the reaction system and the environment, and between the reactors inside the system, there is a cyclical mass transfer in moments when the state of equilibrium is reached in the reactors. Based on the model, the basic parameters of the electrothermal reduction process of SiO₂ and Al₂ O₃ oxides were determined and a comparative analysis was made towards the ferrosilicon process.

Słowa kluczowe

EN

FeSiAl; FeSi75; model; submerged arc furnace; Gibbs energy minimization method

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2018
• Tom: Vol. 63, iss. 2
• Strony: 975--979
• Opis fizyczny: Bibliogr. 10 poz., rys., tab., wykr., wzory

Twórcy

autor

Machulec B.

• Silesian University of Technology, Dep. of Engineering Production, 8 Str Krasińskiego, 40-019 Katowice, Poland

autor

Bialik W.

• Silesian University of Technology, Institute of Metals Technology, 8 Str Krasińskiego, 40-019 Katowice, Poland

autor

Gil S.

• Silesian University of Technology, Institute of Metals Technology, 8 Str Krasińskiego, 40-019 Katowice, Poland

Bibliografia

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Uwagi

EN

1. This paper was created with the financial support of Polish Ministry for Science and Higher Education under internal grant BK-221/RM0/2018 for Faculty of Materials Engineering and Metallurgy, Silesian University of Technology, Poland.

PL

2. Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).