Carbon dioxide gas and slaked lime are produced again
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When slaked lime reacts again with carbon dioxide gas, high-quality soda ash can be produced. This is a good method! The question now is: where does carbon dioxide gas come from? In the previous question, *aoye613 mentioned extracting it from the exhaust gases coming out of chimneys, as well as from the exhaust gases in liquid ammonia. Additionally, from what I understand, it can also be extracted from the exhaust gases associated with limestone. Which of these options is suitable for one’s own needs? In particular, it’s important to take into account the integration with slaked lime. I’m not sure if I explained myself clearly… Hehe, I’m not good at expressing myself; I hope everyone can give me some advice
Yes, after being dissolved in a certain amount of water, soda ash is transported through pipes to a carbonation tower where it reacts with carbon dioxide to produce sodium bicarbonate; after filtration and calcination, pure soda ash can be obtained. Where does carbon dioxide come from? For caustic soda manufacturers, carbon dioxide is purified to over 90% for one purpose, and it comes from the flue gas of calcination furnaces (70%) for another ； I think LZ is referring to ammonia-alkali enterprises. Therefore, carbon dioxide can be obtained 1) from the exhaust gases in chimneys, 2) from the exhaust gases in liquid ammonia, and 3) from the exhaust gases of limestone. Consideration must be given to the economic viability of these methods.