Abstract
This paper proposes a new approach on the processing of silicon production waste (microsilica) as a raw material for metallurgical processing. It is known from practice that the granulometric composition of microsilica does not allow its use in metallurgical processing. The authors of this work propose its use together with a reductant as part of a briquetted charge. In this work, the optimal composition of the charge mixture for briquetting is determined. The main focus is on assessing the strength characteristics of the briquettes and analyzing their efficiency in the silicon smelting process. The strength of the briquettes was studied by the dropping method. As a result, in terms of strength and other characteristics, it is highly advisable to use briquettes consisting of 65% of microsilica and 35% special coke screenings. The obtained batches of high-strength briquettes were tested for the smelting of metallurgical grade silicon in a large-scale laboratory ore-thermal furnace to replace the traditional charge mixtures (high-quality quartzites, petroleum coke, wood chips, etc.) with briquettes. It was established that the briquetted monocharge ensures more intensive reduction processes and improves melting conditions compared to the traditional charge. This leads to higher silicon recovery rates, which was confirmed by tests, during which the maximum recovery rate reached 83.1% with a 30% replacement of the charge with briquettes. The batch of metallurgical silicon with 95-96% of Si content was obtained.
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This research has been funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP 14870218).
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All authors contributed significantly to the conception, design, and execution of the study, as well as the analysis and interpretation of the data. Each author has been actively involved in drafting and critically revising the manuscript for important intellectual content. The specific contributions of each author are outlined below:
Alibek Baisanov: Conceptualization, Methodology, Investigation, Supervision. Nina Vorobkalo: Investigation, Writing-Original Draft, Data Analysis. Writing-Review. Aidana Baisanova: Investigation, Writing-Review. Azat Mussin: Methodology, Investigation. Symbat Sharieva: Methodology, Investigation. Amir Makishev: Methodology, Investigation.
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Baisanov, A., Vorobkalo, N., Baisanova, A. et al. A New Approach to the Recycling of Silicon Production Waste (Microsilica) as a Raw Material for Metallurgical Processing. Silicon (2024). https://doi.org/10.1007/s12633-024-03163-w
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DOI: https://doi.org/10.1007/s12633-024-03163-w