Carbothermal Reduction of Quartz and Carbon Pellets at Elevated Temperatures
In this study, the carbothermal reduction of pellets composed of quartz and carbon at temperatures between 1898 K and 1948 K (1625 °C and 1675 °C) are investigated. The main product from this reaction is silicon carbide (SiC). The reduction of quartz with carbon black, charcoal, coke, coal, and pre-heated coal in the pellet were compared to investigate the different carbon resources used in silicon production. Charcoal and coke have high SiO reactivity, while carbon black and coal (pre-heated coal) have low SiO reactivity. Charcoal and carbon black show better matching between quartz/carbon reactivity and SiO reactivity, and will lose less SiO gas than coke and pre-heated coal. Coal has a high volatile content and is thus not recommended as a raw material for the pellets.
The authors acknowledge Elkem and the Research Council of Norway for the financial support through the Project “235123 Silicon Production with use of Natural Gas.” Steinar Prytz from Sintef is acknowledged for providing of SiC/SiO2 pellet and helpful discussion about Sintef SiO reactivity test.
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