Reactive silica materials and process of producing them

Claim 2

A REACTIVE SLICA MATERIAL COMPOSED OF DISCRETE, PHYLLOIDAL PARTICLES CONSISTING ESSENTIALLY OF SILICA AND BOUND WATER ARRANGED IN LAMINAR NETWORKS CONTAINING SILANOL (SSIOH) GROUPS AT A CONCENTRATION OF MORE THAN 10 MICROMOIS PER SQUARE METER OF THEIR FLAT BET SURFACE AREA, SAID PARTICLES HAVING A BET SURFACE AREA IN THE RANGE OF FROM 40 TO 130 M.2/G., THEIR FACIAL DIMENSIONS BEING PREDOMINANTLY IN THE RANGE OF FROM ABOUT 0.1 TO ABOUT 5 MICRONS AND THEIR THICKNESSES BEING PREDOMINATLY IN THE RANGE OF FROM ABOUT .005 TO ABOUT .05 MICRON.

Claim 3

A PROCESS OF PRODUCING A REACTIVE PARTICULATE SILICA MATERIAL, WHICH COMPRISES FORMING A SUSPENSION OF A FINELY PARTICULATE KAOLIN IN A 30 TO 60% AQUEOUS SOLUTION OF SULFURIC ACID CONTAINING AN AMOUNT OF SAID ACID SUFFICIENT TO EXTRACT MORE THAN 85% OF THE METAL OXIDE CONTENT OF THE KAOLIN PARTICLES; HEATING THE SUSPENSION IN A CLOSED PRESSURE VESSEL UNTIL THERE OCCURS THEREIN A VIOLENT EXOTHERMIC REACTION THAT BRINGS THE SUSPENSION WITHIN A FEW MINUTES TO A TEMPERATURE BETWEEN 150*C. AND 230*C. AND TO THE CORRESPONDING MULTI-ATMOSPHERIC STEAM PRESSURE; AFTER SAID VIOLENT REACTION DIGESTING THE SUSPENSION AT A TEMPERATURE BETWEEN 105*C. AND 230*C. AND UNDER THE CORRESPONDING SUPERATMOSPHERIC STEAM PRESSURE UNTIL SAID SOLUTION HAS EXTRACTED FROM THE SUSPENDED PARTICLES MORE THAN 85% OF THEIR METAL OXIDE CONTENT; AND THEREAFTER SEPARATING THE SUSPENDED SOLIDS FROM THE REACTION LIQUID.

Claim 4

A PROCESS OF PRODUCING A REACTIVE PARTICULATE SILICA MATERIAL, WHICH COMPRISES FORMING A SUSPENSION OF A FINELY PARTICULATE KAOLIN IN A 30 TO 60% AQUEOUS SOLUTION OF SULFURIC ACID CONTAINING AN AMOUNT OF SAID ACID SUFFICIENT TO EXTRACT MORE THAN 85% OF THE METAL OXIDE CONTENT OF THE KAOLIN PARTICLES; HEATING THE SUSPENSION IN A CLOSED PRESSURE VESSEL UNTIL THERE OCCURS THEREIN A VIOLENT EXOTHERMIC REACTION THAT BRINGS THE SUSPENSION WITHIN A FEW MINUTES TO A TEMPERATURE BETWEEN 150*C. AND 230*C. AND TO THE CORRESPONDING MULTI-ATMOSPHERIC STEAM PRESSURE; AFTER SAID VIOLENT REACTION DIGESTING THE SUSPENSION AT A TEMPERATURE BETWEEN 105*C. AND 230*C. AND UNDER THE CORRESPONDING SUPERATMOSPHERIC STEAM PRESSURE UNTIL SAID SOLUTION HAS EXTRACTED FROM THE SUSPENDED PARTICLES MORE THAN 85% OF THEIR METAL OXIDE CONTENT; AND THEREAFTER SEPARATING THE SUSPENDED SOLIDS FROM THE REACTION LIQUID.