Impending solar grade silcon process produces 75% less carbon than conventional
This is a company press release, so take that for what it is, but the company doing the work does have contracts with the U.S. military. A one step process that doesn't use chemicals to purify the silicon to solar grade is an added bonus. I looked up the company that put out the press release and they're a small Quebec mining exploration firm.
Montreal, Quebec, Canada / TheNewswire / March 15, 2016 - Uragold (TSX Venture: UBR) is pleased to announce the results of a carbon footprint analysis evaluating the environmental impact of its PUREVAP(TM) QVR process versus the conventional Siemens1 process to make polycrystalline solar-grade (Sg) Silicon Metal.
The study was conducted by PyroGenesis Canada Inc. ("PCI" , a clean-Tech company that designs, develops, manufacture and commercializes plasma waste-to-energy systems, plasma torch products and the PUREVAP(TM) Quartz Vaporization Reactor (QVR).
GREENHOUSE GAS EMISSIONS LOWERED BY 75% - SIGNIFICANT ADVANTAGES
The analysis2 shows that the PUREVAP(TM) QVR process would generate 14.1 kg CO2 eq/Kg SG Si, while the Siemens process normally generates 54.0 kg CO2 eq/Kg SG Si of emissions.
http://www.stockhouse.com/news/press-releases/2016/03/15/uragold-carbon-footprint-from-impending-solar-grade-silicon-metal-process