This first step, conversion to metallurgical grade silicon, combines in proportion Quartz, Coke and Woodchips for a carbothermal reaction in a submerged arc furnace. The process yields 99.5% (2N) Silicon, carbon dioxide and silica fumes. It consumes energy up to 12 MWh per ton of metallurgical grade Silicon. Depending upon raw material quality this process may limit impurities as in table below:

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