Basic concepts of calcium carbonate

Calcium carbonate is the main component of limestone Its molecular formula is CaCO3 and its relative molecular weight is 100.09 Calcium oxide accounted for 56.03% and carbon dioxide 43.97% (1) light calcium carbonate: it is also called precipitated calcium carbonate, which is short for light calcium It is made by burning limestone and other raw materials to generate lime and carbon dioxide, then adding water to digest lime to generate lime milk (main component calcium hydroxide), passing into carbon dioxide carbonated lime milk to generate calcium carbonate precipitation, and then dehydrating, drying and crushing Or it can be obtained by the double decomposition reaction of sodium carbonate and calcium chloride to form calcium carbonate precipitate, which is dehydrated, dried and crushed The settling volume of light calcium carbonate is 2.4-2.8ml/g (2) heavy calcium carbonate: for short, it is made by directly grinding natural calcite, limestone, chalk, shell, etc with mechanical method The settling volume of heavy calcium carbonate is 1.1-1.4ml/g (3) active calcium carbonate: also known as modified calcium carbonate, surface treated calcium carbonate, colloidal calcium carbonate or white brilliant, referred to as active calcium, is prepared by surface modification of light calcium or heavy calcium with surface modifier Since the surface modified calcium carbonate has the reinforcing effect, which is called "activity", the modified calcium carbonate is used to be called active calcium carbonate.