Free calcium oxide refers to calcium oxide that does not exist in a combined state but in a free state in the clinker、 also known as free lime (f-CaO). 2Cl2+2Ca (OH) 2=Ca (ClO) 2+CaCl2+2H2O) and gypsum. Calcium oxide is used in the laboratory for drying ammonia and dehydration of alcohols. Calcium oxide is used in steel、 pesticides、 pharmaceuticals、 non-ferrous metals、 fertilizers、 leather making、 and calcium hydroxide production. Calcium oxide can also generate a large amount of heat by reacting with water for drying ammonia and dehydration of alcohols in the laboratory、 and is commonly used in automatic heating packaging. When Humen destructed opium、 Lin Zexu used to add opium and calcium oxide into water to decompose opium in order to prevent waste gas and opium from polluting soil. The process flow includes adding hydrochloric acid to calcium carbonate → acidolysis → neutralization with ammonia water → static precipitation → filtration → reaction with sodium bicarbonate → dehydration of calcium carbonate → drying → calcination → screening → packaging → calcium oxide P>
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