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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium REWAS 2022: Energy Technologies and CO2 Management
Presentation Title Silicon-production from SiO-gas via Gas-phase Reactions
Author(s) Halvor Dalaker
On-Site Speaker (Planned) Halvor Dalaker
Abstract Scope The substitution of solid carbon in silicon production is challenging. As an example, the reaction between SiO<sub>2</sub> and H<sub>2</sub> to Si is thermodynamically unfavourable below 4500 °C . However, the partial reduction to SiO gas is possible. In the Siemens process for high purity polysilicon production, the input is gas-based Si-species like SiH<sub>4</sub> or SiHCl<sub>3</sub>. Today, these species are produced from metallic silicon, but if they could be produced from SiO-gas and Cl<sub>2</sub> directly, there would be no need to produce metallic Si, and no need for the final, challenging reducing step from SiO to Si. In other words, it would be possible to eliminate the need for solid carbon as a reductant, and the associated CO<sub>2</sub>-emissions, in this part of the silicon market. The present work explores these possibilities and identifies the bottlenecks in a potential process. The work is based on thermodynamical calculations using FactSage.
Proceedings Inclusion? Planned:
Keywords Process Technology, Sustainability, Other

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Design of a Molten Salt Metal-air Battery with High-energy Density
Design of Phase Change Material Composites for Efficient and Rapid Storage of Thermal Energy
Development of a Thermodynamic Model for Chromates, Molybdates, Tungstates and Vanadates Involved in the Corrosion of Steels (Fe, Cr, Ni, Mo, W, V) at High Temperatures in Atmospheres Containing O-H-S-C-Cl and Alkaline Salts
Energy Efficiency, Electrification, and Low-carbon Fuels & Energy Sources for Decarbonizing Materials Industry
Geomimicry Inspired MicroNano Concrete as Subsurface Hydraulic Barrier Materials: Learning from Shale Rocks as Best Geological Seals
Heat Island Mitigation Strategy for Urban Areas Using Phase Change Materials (PCM)
Macroscopic Modeling and Phase Field Modeling of Solar Grade Silicon by Molten Salt Electrolysis
Modes of Operation, Design, and Experiments in a Laboratory Solar Convective Furnace System
NOW ON-DEMAND ONLY - Circored Fine Ore Direct Reduction Plus DRI Smelting - Proven Technologies for the Transition towards Green Steel
Power to Hydrogen the Prospects of Green Hydrogen Production Potential in Africa
Radiative Cooling: Harnessing the Cold of Space as a Renewable Thermodynamic Resource
Review on Hydrotalcite-derived Material from Waste Metal Dust, a Solid Adsorbent for CO2 Capture: Challenges and Opportunities in South African Coal Fired Thermal Plant
Silicon-production from SiO-gas via Gas-phase Reactions
Solidification of Salt Hydrate Eutectics Using Multiple Nucleation Agents
Synthesis Methods for Nanoparticle Morphology Control in Clean Energy Applications
The Influence of H2 and CO Atmospheres on SiO Formation
Thermoeconomics and Dyanamics of Orange Hydrogen Production, an Energy Matter
To Decarbonize Industry, We Must Decarbonize Heat
Treatment of an Indigenous Lepidolite Ore for Sustainable Energy Considerations

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