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Carbothermal Reduction of Quartz with Carbon from Natural Gas

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Abstract

Carbothermal reaction between quartz and two different carbons originating from natural gas were investigated in this paper. One of two carbons is the commercial carbon black produced from natural gas in a medium thermal production process. The other carbon is obtained from natural gas cracking at 1273 K (1000 °C) deposited directly on the quartz pellet. At the 1923 K (1650 °C) and CO atmosphere, the impact of carbon content, pellet structure, gas transfer, and heating rate are investigated in a thermo-gravimetric furnace. The reaction process can be divided into two steps: an initial SiC-producing step followed by a SiO-producing step. Higher carbon content and increased gas transfer improves the reaction rate of SiC-producing step, while the thicker carbon coating in carbon-deposited pellet hinders reaction rate. Better gas transfer of sample holder improves reaction rate but causes more SiO loss. Heating rate has almost no influence on reaction. Mass balance analysis shows that mole ratios between SiO2, free carbon, and SiC in the SiC-producing step and SiO-producing step in CO and Ar fit the reaction SiO2(s) + 3 C(s) = SiC(s) + 2 CO(g). SiC-particle and SiC-coating formation process in mixed pellet and carbon-deposited pellet are proposed. SiC whiskers formed in the voids of these two types of pellets.

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Acknowledgments

The authors acknowledge Elkem and Norwegian Research Council for the financial report through the project “Silicon Production with use of Natural Gas (235123).”

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Authors and Affiliations

  1. Department of Material Science and Engineering, Norwegian University of Science and Technology, Trondheim, 7491, Norway

    Fei Li & Merete Tangstad

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  1. Fei Li
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  2. Merete Tangstad
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Correspondence to Merete Tangstad.

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Manuscript submitted April 14, 2016.

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Li, F., Tangstad, M. Carbothermal Reduction of Quartz with Carbon from Natural Gas. Metall Mater Trans B 48, 853–869 (2017). https://doi.org/10.1007/s11663-016-0887-3

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