Decarbonization
Decarbonizing Conventional Silicon Production
Haley Hoover, Robert Bell, Kerry Rippy
Abstract
NREL researchers examine the energy demands and direct CO₂ emissions of conventional silicon production, reviewing alternative reduction technologies and their challenges.
Decarbonizing Conventional Silicon Production
Silicon is essential to photovoltaics, electronics, and advanced manufacturing. However, its conventional production relies on energy-intensive carbothermic reduction.
The Environmental Challenge
According to research published by the National Renewable Energy Laboratory (NREL), conventional metallurgical-grade silicon production typically requires:
11–13 kWh of energy per kilogram of silicon.
4.7–5 tonnes of direct CO₂ emissions per tonne of silicon.
These figures describe conventional silicon production, not the entire downstream semiconductor manufacturing process.
Emerging Technologies
The researchers evaluate alternative approaches, including:
Metallothermic reduction using alternative reductants.
Hydrogen-assisted processes.
Molten-salt electrolysis.
Biocarbon substitution.
Carbon capture and utilization or storage.
Each approach presents different levels of technological maturity, energy requirements, environmental benefits, and economic challenges.
Industrial Significance
Alternative reduction technologies offer opportunities to reduce dependence on conventional carbon reductants.
Their environmental performance must be assessed across the complete production lifecycle, including electricity, reductant manufacturing, feedstock supply, and material recovery.
Original publication: Hoover, H., Bell, R., & Rippy, K. (2024). Emerging Technologies for Decarbonizing Silicon Production.
Journal: Journal of Sustainable Metallurgy, 10, 1921–1932.
Source: https://doi.org/10.1007/s40831-024-00913-3
Independent academic research presented by SilexTech for technical reference. Findings do not represent SilexTech's own experimental results.
