A New Approach to the Recycling of Silicon Production Waste (Microsilica) as a Raw Material for Metallurgical Processing

IF 2.8 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Silicon Pub Date : 2024-09-28 DOI:10.1007/s12633-024-03163-w

Alibek Baisanov, Nina Vorobkalo, Aidana Baisanova, Azat Mussin, Symbat Sharieva, Amir Makishev

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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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回收硅生产废料（微硅石）作为冶金加工原料的新方法

本文提出了一种将硅生产废料（微硅石）作为冶金加工原料的新方法。众所周知，微硅酸的粒度组成不允许用于冶金加工。这项工作的作者建议将微硅石与还原剂一起用作压块炉料的一部分。在这项工作中，确定了用于压块的炉料混合物的最佳成分。主要重点是评估压块的强度特性，并分析其在硅冶炼过程中的效率。采用滴落法研究了压块的强度。结果表明，就强度和其他特性而言，使用由 65% 的微硅石和 35% 的特殊焦炭筛分组成的压块是非常可取的。在大型实验室矿热炉中进行了冶炼冶金级硅的试验，用煤球替代传统的炉料混合物（优质石英岩、石油焦、木屑等），获得了一批高强度煤球。结果表明，与传统炉料相比，压块单炉料可确保更密集的还原过程，并改善熔化条件。这将提高硅的回收率，测试证实了这一点，在测试过程中，用压块替代 30% 的炉料，最高回收率达到 83.1%。这批冶金硅的含硅量为 95-96%。

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来源期刊

Silicon CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.90

自引率

20.60%

发文量

685

审稿时长

>12 weeks

期刊介绍： The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.