Basic refractory compositions for intermediate temperature zones

Claim 1

A PROCESS OF PREPARING A REFRACTORY COMPOSITION COMPRISING THE STEPS OF (A) MIXING 100 PARTS OF A REFRACTORY AGGREGATE CONTAINING AT LEAST 1% BY WEIGHT OF MAGNESIA WITH AN AQUEOUS SOLUTION OF AMMONIUM PHOSPHATES IN THE APPROXIMATE PROPORTIONS BASED ON TOTAL AMMONIUM PHOSPHATES OF 35-40% ORTHOPHOSPHATE, 45-50% PYROPHOSPHATE, 9-11% TRIPOLYPHOSPHATE AND 2-5% AS HIGHER POLYPHOSPHATES, THE AMOUNT OF SAID TOTAL AMMONIUM PHOSPHATES BEING APPROXIMATELY 1.35-8.55 PARTS BY WEIGHT OF P2O5 CONTENT PER 100 PARTS BY WEIGHT OF AGGREGATE, THE AMMONIUM PHOSPHATE CONTENT BEING EQUIVALENT TO ABOUT 10 PERCENT BY WEIGHT AMMONICAL NITROGEN AND ABOUT 34 PERCENT BY WEIGHT P2O5, SAID SOLUTION HAVING APPROXIMATELY 50 PERCENT BY WEIGHT OF WATER THEREIN; (B) SHAPING THE RESULTANT MIXTURE INTO A DESIRED FROM AND ALLOWING SAID SHAPED MIXTURE TO SET; AND (C) THEREAFTER DRYING THE RESULTANT SHAPED AGGREGATE AT A TEMPERATURE OF AT LEAST 250*F.