Magnesia cement products and their manufacture

Claim 1

THE METHOD OF MAKING THERMAL INSULATING MATERIAL COMPRISING AN INSULATION AGGREGATE BONDED WITH A MAGNESIA CEMENT WHICH EVOLVES A SUBSTANTIAL AMOUNT OF HEAT ON SETTING, WHICH METHOD COMPRISES MIXING MAGNESIUM OXIDE, AND AQUEOUS SOLUTION OF A MAGNESIUM SALT SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM CHLORIDE AND MAGNESIUM SULPHATE, AND A SMALL AMOUNT OF A FOAMING AGENT TO FORM A CEMENTITIOUS SLURRY, SAID FOAMING AGENT BEING CAPABLE OF FORMING SAID SLURRY INTO AN UNSTABLE CEMENTITIOUS FOAM, CONVERTING SAID SLURRY INTO SUCH A FOAM, MIXING SUCH CEMENTITIOUS FOAM WITH A VOLUME OF INSULATING AGGREGATE IN GRANULAR FORM TO DISTRIBUTE THE FOAM OVER THE SURFACES OF THE GRANULES OF THE AGGREGATE, AND THEN MOLDING THE MIXTURE, THE VOLUME OF AGGRAGATE BEING OF THE ORDER OF SIX TIMES GREATER THAN THE VOLUME OF GRANULES OF AGGREGATE WHICH COULD BE COVERED AND BONDED BY HE SAME CEMENTITIOUS SLURY IN UNFOAMED CONDITION, SAI FOAM PERSISTING UNTIL AFTER THE COMPLETION OF MIXING WITH THE AGGREGATE AND THEN COLLAPSING, AND THEN LIGHTLY PRESSING THE MOLDED MATERIAL TO BRING THE GRANULES INTO EFFICIENT BONDING CONTACT, THE AMOUNT OF AGGREGATE BEING SUFFICIENT TO ABSORB AND DISSIPATE THE HEAT EVOLVED ON SETTING OF THE CEMENT WITHOUT DEVELOPMENT OF TEMPERATUTE WHICH WOULD DAMAGE THE CEMENT.

Claim 2

THE METHOD OF MAKING THERMAL INSULATING MATERIAL COMPRISING AN INSULATION AGGREGATE BONDED WITH A MAGNESIA CEMENT WHICH EVOLVES A SUBSTANTIAL AMOUNT OF HEAT ON SETTING, WHICH METHOD COMPRISES MIXING MAGNESIUM OXIDE, AND AQUEOUS SOLUTION OF A MAGNESIUM SALT SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM CHLORIDE AND MAGNESIUM SULPHATE, AND A SMALL AMOUNT OF A FOAMING AGENT TO FORM A CEMENTITIOUS SLURRY, SAID FOAMING AGENT BEING CAPABLE OF FORMING SAID SLURRY INTO AN UNSTABLE CEMENTITIOUS FOAM, CONVERTING SAID SLURRY INTO SUCH A FOAM, MIXING SUCH CEMENTITIOUS FOAM WITH A VOLUME OF INSULATING AGGREGATE IN GRANULAR FORM TO DISTRIBUTE THE FOAM OVER THE SURFACES OF THE GRANULES OF THE AGGREGATE, AND THEN MOLDING THE MIXTURE, THE VOLUME OF AGGRAGATE BEING OF THE ORDER OF SIX TIMES GREATER THAN THE VOLUME OF GRANULES OF AGGREGATE WHICH COULD BE COVERED AND BONDED BY HE SAME CEMENTITIOUS SLURY IN UNFOAMED CONDITION, SAI FOAM PERSISTING UNTIL AFTER THE COMPLETION OF MIXING WITH THE AGGREGATE AND THEN COLLAPSING, AND THEN LIGHTLY PRESSING THE MOLDED MATERIAL TO BRING THE GRANULES INTO EFFICIENT BONDING CONTACT, THE AMOUNT OF AGGREGATE BEING SUFFICIENT TO ABSORB AND DISSIPATE THE HEAT EVOLVED ON SETTING OF THE CEMENT WITHOUT DEVELOPMENT OF TEMPERATUTE WHICH WOULD DAMAGE THE CEMENT.