The main component of limestone is CaCO3, which exists in nature with two minerals, calcite and aragonite. Calcite belongs to the trigonal system, hexagonal crystal, pure calcite is colorless and transparent, generally white, containing 56% CaO, 44% CO2, density of 2.715g/cm3, Mohs hardness of 3, and the nature is brittle. Aragonite belongs to the orthorhombic line, rhomboid crystal, gray or white, with a density of 2.94g/cm3 and a Mohs hardness of 3.5-4.
The crystal size of calcite in the physical properties of limestone is very important. The dense limestone exhibits a low porosity and a fine grain crystal structure with high strength. The density of limestone is about 2.65~2.80g/cm3, the dolomitic limestone is 2.70-2.90g/cm3, and the dolomite is 2.85-2.95g/cm3. The bulk density depends on the porosity.
Thermal expansion of limestone: According to the data, the average thermal expansion coefficient of microcrystalline limestone is (4.5~5.0)*10^(-6)/°C in the range of limestone below 800°C, while the coarse crystal is increased to 10.1*10. ^(-6)/°C. Limestone heating experiments have important implications in lime production. At 800 ° C below the decomposition point of limestone, the limestone crystal body expands, and cracks are formed in the highly crystallized limestone, and those crystals which are larger by heating are broken into powder, which is very good for crystal development and contains many The limestone pulverization of dense calcite is more serious.
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