Can silicon dioxide convert to elemental silicon by carbon at low temperature? I have read that the reaction is possible at 1300-1500 degree C.
Without reference, Wikipedia says temperature must be over 1900 °C (https://en.wikipedia.org/wiki/Silicon#Production); other sources give 2350 °C (http://www.madehow.com/Volume-6/Silicon.html) or even 3000 °C (http://www.mcquarriegeneralchemistry.com/mcquarrie_interM_final.pdf). So, it would be helpful if you could specify where you have read about that lower temperature range.
This is very interesting to reduce the white sand at this relatively low temperature.What are the reaction conditions other than the temperature. Please describe the reaction in details.
I suspect that this reaction temperature is possible but it must run in a furnace other than the metallurgical arc furnace. In such furnace, SiC if formed and then it is reduced by carbon at exceedingly high temperature of about 2350°C as Jan-Martin hinted.
Best wishes.
Here are some methods. E.g. by Toshiyuki Nohira et al.
http://www.nature.com/news/1998/030512/full/news030512-16.html
http://radio-weblogs.com/0105910/2003/05/19.html
Stephen Maldonado et al.
http://pubs.acs.org/doi/abs/10.1021/ja310897r
Frank Endres et al.
http://ma.ecsdl.org/content/MA2005-01/7/371.full.pdf
https://www.researchgate.net/publication/222336936_Electrodeposition_of_nanoscale_silicon_in_a_room_temperature_ionic_liquid
https://idw-online.de/de/news78852
Regards,
Joachim
Article Electrodeposition of nanoscale silicon in a room temperature...
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