Activation of heavy calcium carbonate; covering the surface of heavy calcium carbonate particles with a layer of lipophilic activator. There are two methods: dry method and wet method. The technical parameters are mainly activation temperature and stirring speed. The amount of activator or coupling agent added, activation time, etc. should be appropriately changed, as well as particle size, activator selection, etc. Fineness, activation, whiteness, pH, volume, moisture and other industrially active precipitated calcium carbonate; Technical indicators; HG/T 2567-2006 Project indicators Main content of first-class qualified products (calculated as CaCo3), % greater than