nnuut
Moderator | TSP Talk Royalty
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Maybe we could filter all of the CO2 coming from our cars into tanks and sell it to companies that make cement?
Turning CO2 into Cement
by ASLA on 03/24/2010 14:01 0 comments , 562 views
Categories: Green Building, Future Technologies
Tags: co2 emissions, calera, cement production, infranstructure
The New York Times highlights a new technology that turns carbon dioxide emissions from coal and gas power plants into the basic inputs for cement. Calera, the Silicon Valley start-up creating the approach, has received some $50 million in financial support from venture capitalist Vinod Khosla. Peabody Energy, one of the world’s largest coal company, has put $15 million into the idea. While still relatively small numbers compared to overall investments in fossil fuel-related technologies, these first funds signify growing investment in turning CO2 into a reusable, non-polluting resource.
Calera will combine CO2 with “seawater or groundwater brine, which contain calcium, magnesium and oxygen. It is left with calcium carbonate and magnesium carbonate, which are used in making cement and aggregate. It plans to sell it to concrete companies for use in pavement.” To convince building manufacturers that their material is safe, Calera’s CO2-embedded cement is being mixed with Portland cement, the “calcium silicate” binder used in concrete for buildings and transportation infrastructure. Turning CO2 into building materials will make “carbon reduction attractive,” argues Brent Constantz, Calera’s founder and chief executive.
Coal power plants are major emitters of CO2 emissions. Cement production also contributes large amounts. Creating a cycle wherein the coal plants’ waste becomes feedstock for cement will help kill two birds with one stone. Vinod Khosla said: “With this technology, coal can be cleaner than solar and wind, because they can only be carbon-neutral.” [more]
http://sustainablecitiescollective.com/Home/30195

Turning CO2 into Cement
by ASLA on 03/24/2010 14:01 0 comments , 562 views
Categories: Green Building, Future Technologies
Tags: co2 emissions, calera, cement production, infranstructure
The New York Times highlights a new technology that turns carbon dioxide emissions from coal and gas power plants into the basic inputs for cement. Calera, the Silicon Valley start-up creating the approach, has received some $50 million in financial support from venture capitalist Vinod Khosla. Peabody Energy, one of the world’s largest coal company, has put $15 million into the idea. While still relatively small numbers compared to overall investments in fossil fuel-related technologies, these first funds signify growing investment in turning CO2 into a reusable, non-polluting resource.
Calera will combine CO2 with “seawater or groundwater brine, which contain calcium, magnesium and oxygen. It is left with calcium carbonate and magnesium carbonate, which are used in making cement and aggregate. It plans to sell it to concrete companies for use in pavement.” To convince building manufacturers that their material is safe, Calera’s CO2-embedded cement is being mixed with Portland cement, the “calcium silicate” binder used in concrete for buildings and transportation infrastructure. Turning CO2 into building materials will make “carbon reduction attractive,” argues Brent Constantz, Calera’s founder and chief executive.
Coal power plants are major emitters of CO2 emissions. Cement production also contributes large amounts. Creating a cycle wherein the coal plants’ waste becomes feedstock for cement will help kill two birds with one stone. Vinod Khosla said: “With this technology, coal can be cleaner than solar and wind, because they can only be carbon-neutral.” [more]
http://sustainablecitiescollective.com/Home/30195