Development of Technology for Producing Complex Boron-Containing Aluminum-Silicon Ferroalloy
Akberdin A.A. Kim A.S. Tolymbekova L.B. Sultangaziyev R.B.
September 2023Springer
Metallurgist
2023#67Issue 5-6749 - 756 pp.
The purpose of the work is the creation of a boron-containing ferroalloy to improve the quality of ferrous metals. Thus, a single-stage, slag-free and waste-free technology is created with the maximum use of all useful components of the charge. Within the framework of this work, a complete thermodynamic modeling of the method for producing an alloy was performed based on studying the chemistry of the process and the dynamics of changes in the phase and elemental composition of melting products in the temperature range of 500–3000 K, which showed that the boron-containing metal is formed due to the formation of the AlB12 phase, and the process must be carried out at temperature of at least 1800 °C to form the final composition of the ferroalloy. Exceeding it is not desirable due to the transition of the charge components into the gas phase. As a source of boron, it was found expedient to use the Inder borate ores of the Atyrau region and Turkish colemanite. Large-scale laboratory tests were carried out in ore-thermal furnaces with a capacity of 200 kVA to obtain complex boron-containing aluminum-silicon alloys. The possibility of practical production of a boron-containing aluminum-silicon ferroalloy using coals from the Kuu-Chek and Borly deposits has been proved. So, according to the chemical analysis of the experimental metal, the FeSi45Al10B1 alloy contained (wt.%): 43.76 Fe, 45.08 Si, 10.01 Al and 1.02 B, and the FeSi50Al20B1 alloy — 28.5 Fe, 49.89 Si, 20.5 Al и 1.03B. According to the proposed process, 98% extraction of boron from ore into metal is achieved.
borate ore , complex boron-containing alloy , high-ash coal; carbothermic process , one-stage technology , slag-free process , thermodynamic modeling
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Chemical and Metallurgical Institute named after Zh. Abishev, Karaganda, Kazakhstan
Toraigyrov University, Pavlodar, Kazakhstan
Chemical and Metallurgical Institute named after Zh. Abishev
Toraigyrov University
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