Abstract
Micro-silica, a predominant byproduct of industrial silicon enterprises, presents a substantial opportunity for recycling within the production of industrial silicon. In this study, we used micro-silica from an industrial silicon facility and commercially accessible N991 carbon black as experimental materials. We scrutinized the influence of micro-silica and carbon black on the yield and velocity of SiC formation under varying conditions: temperatures of 1625 °C, 1650 °C, and 1675 °C (1898 K, 1923 K, and 1948 K), disparate CO partial pressures, and diverse SiO2 to C molar ratios. Our findings reveal that micro-silica initiates melting at a threshold of 1600 °C. At a temperature of 1650 °C, the loss rate of SiO is minimised, resulting in the highest reaction matching degree. Elevated temperatures and increased CO partial pressures correspond to accelerated reaction rates. The carbothermal reaction rate is accelerated by molten SiO2 and CO. A harmonious correlation was observed between the SiO2 reactivity of the micro-silica and the SiO reactivity of the carbon black. The reaction between SiO2 and SiC in the molten state increases the weight loss rate and the reaction rate. The optimal agglomerate composition was determined to be mol(SiO2): mol(C) = 1:3.
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Acknowledgements
This work was supported by the [Gansu Province Science and Technology Program #1] under Grant [number 23ZDGD002]; [Lanzhou Youth Science and Technology Talent Innovation Project #2] under Grant [number 2023-QN-94] and [National Science Foundation of China #3] under Grant [number 51904140]. We are very grateful for this.
Funding
This work was supported by the [Gansu Province Science and Technology Program #1] under Grant [number 23ZDGD002]; [Lanzhou Youth Science and Technology Talent Innovation Project #2] under Grant [number 2023-QN-94] and [National Science Foundation of China #3] under Grant [number 51904140].
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[Fei Li] contributed to the study conception and design. Material preparation, data collection and analysis were performed by [HanZe Wu], [Fei Li], [WangWang Fu], [KangYu Xuan] and [FanQin Xia]. The first draft of the manuscript was written by [Fei Li] and [HanZe Wu] and all authors commented on previous versions of the manuscript. All authors read and approved the manuscript.
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Li, F., Wu, H., Fu, W. et al. Carbothermal Reduction Behavior of Micro-silica. Silicon (2024). https://doi.org/10.1007/s12633-024-03014-8
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DOI: https://doi.org/10.1007/s12633-024-03014-8