In the conditions of depletion of reserves of high-quality mineral raw materials, development of effective technologies for processing of poor and difficult-to-dress ores is of particular relevance. In this paper, the possibility of obtaining ferrosilicon from polymetallic ore of the Shalkiya deposit by carbothermic reduction using low-ash reducing agents (special coke and coal) is considered. The study was carried out using thermodynamic modeling methods based on the HSC Chemistry software package (Outokumpu) in the Equilibrium Composition module. Equilibrium phase relationships in the Fe-Si-Zn-C-O system were calculated in a wide temperature range (500-2100 °C), and an analysis of the distribution of elements between the metallic and gas phases was carried out. It was found that the highest extraction of silicon into ferroalloy (up to 90%) is achieved at temperatures of 1700-1900 °C, mainly in the form of iron silicide (FeSi) and free silicon. At the same time, effective removal of zinc into the gas phase is ensured at temperatures above 1600°C. The results obtained confirm the prospects of the pyrometallurgical approach for deep processing of ores containing silica and volatile components, without the need for preliminary flotation enrichment. The presented data can serve as a basis for conducting pilot tests to obtain various silicon-containing alloys from the ores of the Shalkiya deposit.

VOROBKALO N.R.

PhD, Senior Researcher at the «Pyrometallurgical Processes» Laboratory, Zh. Abishev Chemical-Metallurgical Institute, Karaganda, Kazakhstan

E-mail: nina.timirbaeva23@gmail.com, https://orcid.org/0000-0002-3240-104X 

BAISANOV A.S.

Candidate of technical sciences, professor, head of the «Pyrometallurgical Processes» Laboratory, Zh. Abishev Chemical-Metallurgical Institute, Karaganda, Kazakhstan

E-mail: alibekbaisanov@mail.ru, https://orcid.org/0000-0002-3025-7267

ISAGULOVA D.A.

PhD, Associate Professor of the Department of Nanotechnology and Metallurgy, Karaganda Technical University named after Abylkas Saginov, Karaganda, Kazakhstan

E-mail: isagulovada@mail.ru https://orcid.org/0000-0002-0166-0225

IBRAKHIMOVA Zh.A.

Master’s student, Karaganda Technical University named after Abylkas Saginov, Karaganda, Kazakhstan

E-mail: zhanna.ibrakhimova@mail.ru, https://orcid.org/0009-0003-8622-6165

SHARIYEVA S.S.

Engineer at the «Pyrometallurgical Processes» Laboratory, Zh.Abishev Chemical-Metallurgical Institute, Karaganda, Kazakhstan

E-mail: shariyeva.symbat@mail.ru, https://orcid.org/0009-0006-3018-5458

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polymetallic ore, thermodynamic modeling, HSC Chemistry, carbothermal reduction, ferrosilicon