Industrial process for preparing nm-class active calcium carbonate

• Main Authors: CAO XUEQIN, LI HONGWEI, ZHAO XIANGMEI, DONG YUN, LUO CHENGJUN, HU NA
• Format: Patent
• Language: Chinese; English
• Published: 23.01.2008
• Subjects: CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT THEREOF; METALLURGY; NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS,MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES ASDISCRETE UNITS; NANOTECHNOLOGY; PERFORMING OPERATIONS; TRANSPORTING

The invention provides the industrial preparation method of the nano activated calcium carbonate. The crystal control agent is added in the suspending liquid of the calcium hydroxide and is carbonized by the kiln gas containing the carbon dioxide. Through controlling the temperature and concentration of the calcium hydroxide, the concentration of the carbon dioxide and the addition and variety of the crystal control agent, the initial nucleation rate and nucleation quantity of the crystal and the growth rate of each crystal face of the crystal during carbonization are adjusted to realize the shape control of the crystal, and then surfactant is added to conduct activating treatment. The nano activated calcium carbonate is gained after filtering and drying, which has a shape of cube and is regulable when the grain size is between 20nm to 100nm. The product gained by the method has excellent performance and can work as the functional filler, which can be widely used in such industries as top-grade coating, rubbe