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CaO is created by frying CaCO3, typically heated with coal. You can then mix it with water to get cement. At least that's what I learned in school. How would y
by H8crilA 7y ago
CaO is created by frying CaCO3, typically heated with coal. You can then mix it with water to get cement. At least that's what I learned in school.
How would you like to create CaO without providing energy if the reverse reaction is exothermic?
Or am I missing the fact that there's a lot of unbound CaO in rocks?
Also, production of cement is one of the major sources of CO2 emissions.
- Tuna-Fish 7y agoThe volcano did the frying, and the result was trapped into bubbles of rock where it could not come into contact with CO2 from the air. Although most of it is not directly as oxides but some form of silicates. (This forces the use of lots of water in the process -- you can go from CaO -> CaCO3 without much water, but to dissolve silicates you need the CO2 dissolved in water.)
- pfdietz 7y agoThe exothermic reactions involved in mineral carbonation are silicates + CO2 => carbonates + SiO2. These reactions mimic those that naturally extract CO2 from the atmosphere over geologic time, but greatly accelerated.