Calcite, the main chemical component of which is calcium carbonate (CaCO3), is now widely used in covering materials, plastic materials, rubber packing materials, cosmetic stuffing materials, medicine supporters food-stuff, toothpaste grating materials, paper manufacture industry and so on.
The quality of calcium carbonate is not so strictly requested when it is generally used in industry. But in some special industries calcium carbonate is requested to be of high quality such as drug, food and their packing materials. Especially some heavy metal elements, which turn to be harmful to human body, are strictly set limits to their concentrations in calcium carbonate (American USP and FCC standards). But the traditional lightweight calcium carbonate cannot meet the strict request of acceptable heavy metal contents. As the technique of powder processing improved day by day, there is a worldwide trend to use natural heavyweight calcium carbonate instead of lightweight calcium carbonate for the sake of human health