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Keywords = briquetted monocharge

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16 pages, 7756 KiB  
Article
Optimization of the Properties of Microsilica-Based Composite Briquettes Depending on Their Granulometry
by Alibek Baisanov, Nina Vorobkalo, Yerbol Shabanov, Nikolay Zobnin, Aidana Baisanova, Symbat Sharieva, Askhat Akuov, Yerulan Samuratov, Zhanna Ibrakhimova and Temirlan Zhumagaliev
J. Compos. Sci. 2024, 8(11), 439; https://doi.org/10.3390/jcs8110439 - 24 Oct 2024
Viewed by 993
Abstract
This paper presents the results of optimizing the physicochemical properties of microsilica-based composite briquettes for metallurgical-grade silicon production. Microsilica, a waste product of silicon production, contains a sufficiently high amount of silicon dioxide (96–97%). This fact makes microsilica a promising composite material for [...] Read more.
This paper presents the results of optimizing the physicochemical properties of microsilica-based composite briquettes for metallurgical-grade silicon production. Microsilica, a waste product of silicon production, contains a sufficiently high amount of silicon dioxide (96–97%). This fact makes microsilica a promising composite material for metallurgical processing. However, its granulometric composition limits its direct use. The method of briquetting on an industrial briquetting press was used. The influence of the granulometric composition of the composite mixture on the heat tolerance and reactivity of the finished briquettes was studied. The methods of obtaining and testing the briquettes, their composition, and the briquetting and drying process were described. The obtained briquettes were tested for the smelting of metallurgical silicon. The silicon recovery rate in the metal with the standard charge was 71%, while the recovery rate with the briquetted monocharge was 85%. The results of silicon smelting from the briquettes demonstrated the high quality of the obtained metal, corresponding to the standards of metallurgical-grade silicon. The implementation of these technologies improves the quality of the finished product and addresses environmental issues related to the disposal of microsilica, reducing its accumulation and minimizing its impact on the environment. Full article
(This article belongs to the Section Composites Modelling and Characterization)
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14 pages, 1346 KiB  
Article
Test Results of Crystalline Silicon Melting Process from Briquetted Monocharge Obtained from Microsilica
by Alibek Baisanov, Nina Vorobkalo, Yerbol Shabanov, Azat Mussin, Symbat Sharieva and Amir Makishev
Processes 2024, 12(9), 1911; https://doi.org/10.3390/pr12091911 - 5 Sep 2024
Cited by 3 | Viewed by 1326
Abstract
Currently, enterprises producing crystalline silicon are facing the formation and accumulation of large volumes of microsilica, a technogenic dusty waste formed during the melting of silicon alloys. Due to its chemical composition, this waste can be a significant raw material for metallurgical production. [...] Read more.
Currently, enterprises producing crystalline silicon are facing the formation and accumulation of large volumes of microsilica, a technogenic dusty waste formed during the melting of silicon alloys. Due to its chemical composition, this waste can be a significant raw material for metallurgical production. Therefore, this study is aimed to solve the problem of recycling microsilica. For these studies, a technology for the combined briquetting of microsilica and a carbonaceous reducing agent was developed for the production of a pilot batch of briquettes. This paper presents the results obtained from the process of testing the melting of crystalline (technical) silicon from briquetted monocharge obtained from microsilica. The tests were conducted under large-scale laboratory conditions on a 200 kVA ore-thermal furnace, where 30, 50, and 100% replacements of the traditional charge mixture with briquettes were tested. The results of this study showed that briquettes in the melting process of technical silicon can be successfully used in the range of 0 to 50%. The use of briquettes can significantly improve the technological indicators. The maximum extraction of silicon (approximately 83%) was achieved at 30% replacement. The technical and economic indicators of the process also improved. In particular, an increase in productivity was observed in comparison with tests on a traditional charge. Full article
(This article belongs to the Section Materials Processes)
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