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(1) Carbonization method: calcining raw materials such as limestone to produce lime (the main component is calcium oxide) and carbon dioxide, and then adding water to digest the lime to form lime milk (the main component is calcium hydroxide), and then introducing carbon dioxide carbonized lime milk to form calcium carbonate. Precipitation, and finally the calcium carbonate precipitate is dehydrated, dried and pulverized to obtain light calcium carbonate.
(2) Soda ash (Na2CO3) calcium chloride method: calcium chloride is added to a soda ash aqueous solution to form a calcium carbonate precipitate.
(3) Caustic soda method: In the process of producing caustic soda (NaOH), a by-product light calcium carbonate can be obtained. Calcium carbonate precipitation can be formed by adding slaked lime to an aqueous solution of soda ash, and at the same time, an aqueous solution of caustic soda is obtained. Finally, the precipitate of calcium carbonate is dehydrated, dried and pulverized to obtain light calcium carbonate.
(4) Calcium method: calcium chloride solution is obtained by treating hydrated lime with hydrochloric acid, and calcium chloride solution is carbonized by carbon dioxide after inhaling ammonia gas to obtain calcium carbonate precipitation.
(5) Solvay method: in the process of producing soda ash, a by-product light calcium carbonate can be obtained. The saturated brine is carbonized with carbon dioxide after inhaling ammonia gas to obtain a heavy alkali (sodium hydrogencarbonate) precipitate and an ammonium chloride solution. Calcium chloride aqueous solution is obtained by adding lime milk to the ammonium chloride solution, and then carbonizing it with carbon dioxide to obtain calcium carbonate precipitation.
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