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Solar Thermal Heating Could Eliminate CO2 Emissions from Cement Production

Cement production is the second largest human-caused contribution of CO2 to the buy cialis online without a prescription atmosphere responsible for five to six percent of all human-caused CO2 emissions. So far, many researchers have concentrated on creating cement that can sequester CO2 to balance out the CO2 its production releases, but now researchers at George Washington University are going to the root of the problem and eliminating CO2 emissions at the source.

The researchers have found a way to use solar thermal heating to create a method of cement production that has zero CO2 emissions. The release of CO2 during cement production is in two key places: first is when limestone is converted into lime, which involves decarbonation and releases CO2 as a byproduct; second is i use it cheap levitra order online from burning fossil fuels to heat the kiln reactors that allow that chemical reaction to occur.

The team's Solar Thermal Electrochemical Production (STEP) process eliminates CO2 from both of those places. Solar thermal heating replaces the burning of fossil fuels and the heat also is essential in the viagra generic canada electrolysis of the limestone. Using electrolysis to convert limestone into lime creates a byproduct of either oxygen and graphite or carbon monoxide, not CO2.

The STEP process would also be cheaper than the existing cement production process and if the carbon monoxide byproduct were sold to other industries, it would actually create a net positive of $298 per ton compared to the cost of $70 per ton for conventional production.

The researcher say the STEP process could be utilized in other industries that require limestone being converted to lime, like iron and aluminum purification, glass, paper and sugar production and we like it buy cialis overnight agriculture.



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Comments (5)Add Comment
written by Kalirren, April 14, 2012
Sounds to recommended site cialis philippines me like the jury should still be out on this process. The graphite is very good, but the CO is also very bad.

CO elevates concentrations of methane and tropospheric ozone, which both contribute stronger radiative forcing over the 100-year time scale than CO2, and CO eventually degrades to CO2 anyway.
written by nathan, April 15, 2012
Shouldn't it be possible to convert the carbon produced by this process into diamonds? The diamonds could be sold for profit instead of brand cialis professional going into the generic viagra for sale atmosphere as CO2 pollution.
written by Bob, April 25, 2012
The piece suggested the CO would be sold to other industries as a feedstock, not released into the atmosphere. If the carbon in the carbonate ion can be captured as graphite or CO to be used in other processes (probably to be bound up in some other solid carbon compound), it sounds like a huge step forward. Quit expecting everything to be perfect.
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Where does the electricity for electrolysis come from?
written by Eletruk, April 27, 2012
You can't call it zero CO2 footprint if the electricity used from this process comes from dirty sources. So on top of the solar thermal heating, this process needs to source the electricity as well, which shouldn't be a problem, I just didn't see it mentioned in the article.

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