Manufacture of light coloured aluminous cement

Claim 1

A PROCESS FOR THE PRODUCTION OF ELEMENTAL PHOSPHORUS AND A HIGH ALUMINA CEMENT CONSISTING OF THE STEPS OF COMPOUNDING A PHOSPHORUS CONTAINING MINERAL MIXTURE OF NATURALLY OCCURRING FLUORINE CONTAINING ALUMINUM PHOSPHATE AND A NATURALLY OCCURRING CALCIUM PHOSPHATE, AT LEAST ONE OF WHICH PHOSPHATES CONTAINS SILICA WHICH ON THERMAL REDUCTION WILL PRODUCE A SLAG CONSISTING ESSENTIALLY OF ALUMINA AND LIME WITH A WEIGHT RATIO OF FROM 0.50 TO 1.85, AND FLUORINE AND SILICA, FLUORINE UP TO 3.5% BY WEIGHT WHEN HAVING SILICA UP TO 5% BY WEIGHT AND FLUORINE UP TO 2.5% BY WEIGHT WHEN HAVING SILICA UP TO 10% BY WEIGHT, THERMALLY REDUCING SAID MINERAL MIXTURE IN A FURNACE, WITHDRAWING SAID SLAG IN A MOLTEN STATE FROM THE FURNACE DURING THE REDUCTION OF SAID MIXTURE, AND COOLING THE MOLTEN SLAG SUFFICIENTLY SLOWLY TO OBTAIN A NON-GLASSY MATERIAL SUITABLE FOR GRINDING TO A HIGH ALUMINA CEMENT.