100 mesh limestone powder 1 cubic weight is between 2.65 and 2.80 tons. The density of limestone is about 2.65 to 2.80g/cm3, 1m3=cm3, the weight of cubic meter of limestone is: cm3× (2.65 to 2.80 g), and the weight of limestone powder 1 cubic meter is between 2.65 and 2.80 tons. The main component of quicklime is calcium oxide. The preparation method is that the natural rock with the main component of calcium carbonate is calcined at high temperature, which can be decomposed into carbon dioxide and calcium oxide.