Why bother heating up the limestone?
It seems like heating up limestone until it breaks down into
lime is a lot of hard work to get alkalinity into the ocean. Why not put the limestone directly in the water?
Well, the problem is that limestone is very insoluble, which explains the continuing existence of the White Cliffs of Dover. It is possible to get limestone to dissolve in water,
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but you have to grind it to an
extremely small size and even then it dissolves very slowly. To enhance the ability of the oceans to act as a carbon sink, you need the reaction to take place in the top 100m of the ocean, as this is the layer where most of the mixing with the atmosphere takes place. Even small particles of limestone sink like stones (which is after all what they are) and little of the required reaction will occur in the right place. To grind limestone down into a fine enough powder is both expensive both in terms of energy and in terms of the equipment required. Also the energy that is required is mechanical energy which is much more expensive than heat energy.
There are other sources of alkalinity that can be added. Kheshgi identified mineral deposits of soda ash (Na2CO3) as one such source, but noted that using the world’s entire recoverable resources of
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soda ash would offset just a single year of CO2 emissions. Caldera and Rau have put forward an idea that reacts CO2 from the flue gases of power stations with limestone and then puts the resulting calcium bicarbonate solution into the sea – this has a lot of merit – it addresses CO2 before it is emitted,
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but does not remove CO2 from the air after it has been emitted, as the process described on this website does.
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