| abstract |
THIS SPECIFICATION DISCLOSES A METHOD OF PREPARING A PIGMENT FOR USE, FOR EXAMPLE, ON PAPER SURFACES COMPRISING: CALCINING A DOLOMITIC LIMESTONE TO THE OXIDES OF MAGNESIUM AND CALCIUM, SLAKING AT LEAST A CALIUM OXIDE COMPONENT IN WATER TO THE CORRESPONDING HYDROXIDE, CARBONATING ONLY THE CALCIUM PORTION THEREOF TO THE CARBONATE, SLAKING ANY REMAINING MAGNESIUM OXIDE IN WATER TO THE CORRESPONDING HYDROXIDE, DEWATERING THE RESULTING SLURRY, AND IF DESIRED, WASHING AND HOMOGENIZING THE CALIUM CARBONATE AND MAGNESIUM HYDROXIDE MIXTURE, TO PRODUCE A MICRON SIZED PIGMENT PRODUCT USEFUL IN A NUMBER OF APPLICATIONS. |