Re: Obama is 2nd biggest supporter of coal industry
by
Madai
10/16/2007, 12:34 PM #
supporting coal is just a matter of realism. Even ignoring electricty, it is chemically essential to solar cell production.(as well as iron and aluminum)
Solar cells are made of silicon. In nature, silicon is typically bonded to oxygen(common sand&quartz). There is only one way to break the silicon-oxygen bond-- heat the sand in the presence of coke or or charcoal to over 2000C. Coke is purified coal, charcoal is to wood what coke is to coal.
That can get you 99% pure silicon. Electricity is essential for achieving the 99.9999% pure silicon required by the solar industry. One common way to purify silicon is to use hydrochloric acid, which is readily produced from common table salt if you have the machines and the electricity.
So, even if we go "100%" solar, we'll still need carbon-rich feedstocks. In the meantime, coal makes up 50% of electricity generation, and we will need to produce over 5 square miles of solar panels per year in the US to replace coal for good as an electricity source.
As wood is more versatile than coal, wood nearly always will command a higher price than coal, BTU for BTU. Ergo, when coal is available for coke, it will always be used in place of charcoal.
5 square miles of solar panels will take a lot of silicon, which will take a lot of carbon, which will take a lot of coal.
The coal industry will not go away in our lifetimes, no matter what we do. Get over it.