Hydrated Lime?

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Originally Posted by donh54

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For the more environmentally aware amongst us, lime mortar actually absorbs all the CO2 that it produced during the slaking, when it sets. ......

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The CO2 is emitted in the lime 'burning', not the slaking (2CaO + H2O --> 2CaoH). And while setting of the mortar will absorb the same amount of CO2 released by the reaction CaCO3 --> CaO + CO2, the majority of the CO2 produced by lime burning is usually from the burning of the fuel to generate the heat needed for the endothermic reaction. (Of course, if it is doe in an electric furnace, using renewable electricity.... but it never is!)

John

Quote:

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Originally Posted by JDNSW

The CO2 is emitted in the lime 'burning', not the slaking (2CaO + H2O --> 2CaoH). And while setting of the mortar will absorb the same amount of CO2 released by the reaction CaCO3 --> CaO + CO2, the majority of the CO2 produced by lime burning is usually from the burning of the fuel to generate the heat needed for the endothermic reaction. (Of course, if it is doe in an electric furnace, using renewable electricity.... but it never is!)

John

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You're dead right - my bad :(