The paper addresses the problem of fine fraction generation during the processing of high-carbon ferrochrome (HCFeCr), which is one of the key factors reducing the efficiency of ferroalloy production. It is shown that the formation of fines is обусловлено both by the structural and phase characteristics of the ingots - including their brittleness and the presence of internal defects - and by the technological parameters of crushing. During pilot-scale industrial tests, ferrochrome of grade FKh-900 was crushed at discharge gap settings of 150, 170, and 190 mm, followed by an assessment of the yield of marketable and off-spec fractions. It was established that increasing the gap to 190 mm ensures a reduction in the yield of the fine fraction (0-5 mm) to 23.14%, which is 3.13% lower compared to the base mode (220 mm). Additionally, it was found that changes in crushing parameters affect the fracture behavior of the material and the degree of its overgrinding. It was determined that optimization of the crushing regime contributes to improving the particle size distribution and increasing the yield of the on-spec product.

Based on the obtained results, a technological recommendation is substantiated to reduce screenings by optimizing the feed size and crushing parameters. It is proposed to maintain the discharge gap at 190 mm as the most rational operating mode of the equipment. The results obtained have practical significance for improving the efficiency of ferroalloy processing, reducing losses of marketable products, and increasing the economic efficiency of production.

TAIKENOV ZH.A.

Master’s degree student, K. Zhubanov Aktobe regional university, Aktobe, Kazakhstan

E-mail: Zhassulan.Taikenov@erg.kz, https://orcid.org/0009-0005-8195-925Х

SHABANOV E.ZH.

PhD, associate professor, K. Zhubanov Aktobe regional university, Aktobe, Kazakhstan

E-mail: yshabanov@zhubanov.edu.kz, https://orcid.org/0000-0001-6902-1211

ZHUMAGALIEV E.U.

Candidate of technical sciences, associate professor, K. Zhubanov Aktobe regional university, Aktobe, Kazakhstan

E-mail: yzhumagaliyev@zhubanov.edu.kz, https://orcid.org/0000-0003-2227-0661

KUANYSHEV M.K.

Candidate of technical sciences, associate professor, K. Zhubanov Aktobe regional university, Aktobe, Kazakhstan

E-mail: mkuanyshev@zhubanov.edu.kz, https://orcid.org/0000-0001-8307-3675

1. Михайлов В.Г. Производство ферросплавов: учебное пособие. Липецк: ЛГТУ, 2011. 56 с.
2. Singh A., Tripathy S., Satpathy S. Microstructural evolution and solidification behavior of high-carbon ferrochrome. Journal of Alloys and Compounds, 2020, p 842-844.
3. Kumar V., Kumar P., Suri A. Effect of cooling rate on carbide morphology and fragmentation in Fe-Cr-C alloys. Materials Characterization, 2018, 139: p 320-330.
4. Daavittila J., Holappa L., Xiao Y. Formation mechanisms and morphology of carbides in high-carbon ferrochrome alloys. Metallurgical and Materials Transactions B, 2006, 37(5): p 765-774.
5. Isagulov A. Saulebek Zh., Sagintayeva S., Makhambetov Y. Ferrochrome Smelting Using Chrome Raw Materials Pre-Reduced with Various Reducing Agents. Metals 2026, 16(3), 357. DOI: https://doi.org/10.3390/met16030357

crusher, crushing, discharge gap, high-carbon ferrochrome, hydraulic hammer, particle size distribution