Chemical and Metallurgical Institute named after Zh. Abishev (Karaganda, Kazakhstan):

Ye. N. Makhambetov, Mag. Eng., Scientific Researcher, Lab. of Pyrometallurgical Processes
N. R. Timirbayeva, Mag. Eng., Junior Scientific Researcher, Lab. of Pyrometallurgical Processes, E-mail: nina.timirbaeva23@gmail.com
S. O. Baisanov, Dr. Eng., Prof., Director
A. S. Baisanov, Cand. Eng., Associate Prof., Head of the of Pyrometallurgical Processes

Complex ferroalloys which include alkaline earth metals (such as calcium, magnesium, barium and other metals) have particular importance for high-quality metallurgy. In addition, development of the theory and practice of modification of cast iron, cast and deformed steel stipulated necessity in creation of the new type of product — modifiers with participation of rare earth and alkaline earth elements. Alkaline earth metals (AEM), having a high chemical affinity to oxygen and most other harmful impurities, as well as low solubility in liquid iron, are one of the most effective deoxidizers, desulfurizers, dephosphorizers and steel modifiers. The widespread use of AEM in the industry opens up real possibilities for quality improvment of steel and cast iron, reduction of the mass of metal products, rise of their operation reliability and durability and, as a result, significant metal savings. Previously the authors have developed the experimental batch of complex ferroalloy containing calcium, barium and magnesium with the following chemical composition, %: Ca — 11–15, Si — 50–55, Al — 12–20, P — 0,06, S — 0,02, Mg — 1,2, Ba — 1,3 and Fe is the rest. This ferroalloy was obtained as a result of large-scale laboratory tests simulating industrial conditions at the experimental site of Chemical and Metallurgical Institute named after Zh. Abishev. Efficiency of application of each new ferroalloy for deoxidation, microalloying and steel modification is determined primarily by its various characteristics (chemical and phase composition, mineralogy, thermal properties, etc.). Correspondingly, the current research is based on different studies that were carried out for the obtained calcium-containing ferroalloy, including the following ones: investigation of the phase composition by X-ray phase analysis, study of phase transformations during heating by the differential thermal analysis, determination of mineralogical composition and density by metallographic studies and by the pycnometer method.

Presented results were obtained during execution of the scientific and technical program No. BR05236708 “Scientific and technological substantiation of widening of raw material base of the ferroalloy industry owing to involvement of slightly coking power generating coals and man-caused wastes in order to receive the new materials of multi-purpose destination”, within the framework of the contract for the programmed and aimed investment for 2018–2020 with the Scientific Committee of the Ministry of Education and Science of Kazakhstan Republic and grant investment of the scientific researches for 2018–2020 with the Scientific Committee of the Ministry of Education and Science of Kazakhstan Republic on the theme АР05130225.

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