IMPROVED PROCESS FOR MANUFACTURING ZIRCONIA-TREATED TITANIUM DIOXIDE PIGMENTS

摘要

AN IMPROVED PROCESS IS DESCRIBED FOR MANUFACTURING ZIRCONIA-TREATED TITANIUM DIOXIDE PIGMENTS, WHEREIN THE ZIRCONIA TREATMENT IS ACCOMPLISHED IN THE PROCESS OF FLUIDIZING A TITANIUM DIOXIDE FILTER OR PRESS CAKE AND THEN DRYING THE SAME, THROUGH THE ADDITION TO THE FILTER OR PRESS CAKE OF ONE OR MORE ALKALINE WATER-SOLUBLE ZIRCONIUM REAGENTS SELECTED FROM AMMONIUM ZIRCONYL CARBONATE, THE WATER-SOLUBLE AMMONIUM ZIRCONYL CARBOXYLATES AND MIXTURES OF THESE. AQUEOUS SOLUTIONS OF SUCH ZIRCONIUM REAGENTS, IN ADDITION TO BEING EFFECTIVE FOR IMPARTING A ZIRCONIA SURFACE TREATMENT TO THE TITANIUM DIOXIDE MATERIALS, ALSO PROVE TO BE EFFECTIVE FLUIDIZING AGENTS FOR FORMING HIGH SOLIDS DISPERSIONS OF THE ZIRCONIA-TREATED TITANIUM DIOXIDE PIGMENT MATERIALS WHICH CAN BE SPRAY DRIED WITHOUT SUBSTANTIAL DILUTION AND EXCESSIVE ENERGY REQUIREMENTS. (NO SUITABLE FIGURE)