Method of making porous calcium silicate products

Claim 1

THE METHOD OF MAKING LIGHT APPARENT DENSITY PRODUCTS FROM STABLE SUSPENSIONS OF FINELY DIVIDED REACTIVE SOLIDS, WHICH METHOD COMPRISES FORMING AN AQUEOUS SLURRY HAVING DISPERSED THEREIN REACTED HYDROUS CALCIUM SILICATE CRYSTALS IN DISCRETE PARTICLE FORM, AND FINELY DIVIDED REACTIVE SOLIDS OF LIME AND SILICA, SAID DISCRETE PARTICLES BEING OF LATH-LIKE SHAPE AND HAVING COLLOIDAL DIMENSIONS AND THE CHEMICAL COMPOSITION 4CAO.5SIO2.5H2O, SAID PARTICLES HAVING SURFACE AREAS OF APPROXIMATLEY 48 TO 15 SQUARE METERS PER GRAM OF WEIGHT, THE MOLAR RATIO OF LIME TO SILICA BEING 0.8:1, MIXING SAID SLURRY TO UNIFORMLY DISPERSE BOTH THE DISCRETE PARTICLES AND THE SOLIDS THROUGH THE LIQUID TO THEREBY FORM A STABLE SUSPENSION THEREOF, THE LIQUID TO SOLIDS RATIO BEING IN EXCESS OF 1:1 BY VOLUME, AND REACTING THE REACTIVE SOLIDS OF SAID SLURRY BY SUBJECTING SAME TO A TEMPERATURE AND PRESSURE IN EXCESS OF 175* C. AND 130 P.S.I. ABS., RESPECTIVELY.