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There are two main quality requirements for limestone used in industrial lime. First, it requires a high calcium carbonate content, which is generally required to be above %. Second, its structural grains should be small, because limestone with small grains does not have tight intercrystals, and when it contains organic matter, the organic matter is burned to form a porous shape, and carbon dioxide is easily separated, so it is easy to calcine. Third, there are few impurities, especially harmful ingredients such as silica, magnesium oxide, aluminum oxide, iron oxide, sulfur and phosphorus. If these components are one percent in limestone, they are eighteen percent in calcined quicklime. Calculating one ton of lime requires 1,000 tons of limestone according to theoretical calculations, but there is a certain difference between the degree of rawness and overburning during calcination and the quality of the limestone.