Method of preparing defluorinated material

Claim 1

A METHOD OF PREPARING SUBSTANTIALLY FLUORINE-FREE DICALCIUM PHOSPHATE WHICH COMPRISES REACTING COMMINUTES FLORIDA PHOSPHATE ROCK EITH SULFURIC ACID OF APPROXIMATELY 53* BE, IN A RATIO OF APPROXIMATELY 10 TONS OF ROCK TO 6 TONS OF SULFURIC ACID, AGING THE ACID ROCK MIX, COUNTERCURRENTLY LEACHING THE SOLUBLE CONSISTUENTS FROM THE ACID ROCK MIX WITH AQUEOUS MEDIUM TO PRODUCE A LEACHED SOLUTION OF APPROXIMATELY 32* BE DILUTING THE FILTRATE TO APPROXIMATELY 14% P2O5 CONCENTRATION, TREATING THE FILTRATES WITH CALCIUM CARBONATE IN THE RATIO OF APPROXIMATELY 15 PARTS OF P2O5 TO APPROXIMATELY 4.7 PARTS OF CALCIUM CARBONATE TO PRODUCE A PH IN THE SOLUTION RANGING BETWEEN ABOUT 2.3 AND 3.0 AREACTING THE MIXTURE OF APPROXIMATELY 30 MINUTES, FILTERING THE RESULTANT SLURRY TO SEPARATELY RECOVER A SECOND FILTRATE OF DEFLUORINATED LIQUOR CONTAINING SUBSTANTIALLY ALL OF THE P2O5 VALUES AND THE PRECIPITATED SOLIDS AND REACTING THE DEFLUORINATED LIQUOR WITH ADDITIONAL CALCIUM CARBONNATE IN THE RATIO OF P2O5 TO CALCIUM CARBONATE OF 1 TO 1, FILTERING THE SOLIDS AFTER THE RACTION FOR APPROXIMATELY 1 HOUR TO RECOVER THE DICALCIUM PHOSPHATE PRECIPITATED SOLID MATERIAL, AND DRYING SAID SOLIDS AT A TEMPERATURE OF APPROXIMATELY 250*F. TO PRODUCE A PRODUCT ANALYZING APPROXIMATELY 20% ELEMENTAL PHOSPHORUS.

Claim 2

A METHOD OF PREPARING SUBSTANTIALLY FLUORINE-FREE DICALCIUM PHOSPHATE WHICH COMPRISES REACTING COMMINUTES FLORIDA PHOSPHATE ROCK EITH SULFURIC ACID OF APPROXIMATELY 53* BE, IN A RATIO OF APPROXIMATELY 10 TONS OF ROCK TO 6 TONS OF SULFURIC ACID, AGING THE ACID ROCK MIX, COUNTERCURRENTLY LEACHING THE SOLUBLE CONSISTUENTS FROM THE ACID ROCK MIX WITH AQUEOUS MEDIUM TO PRODUCE A LEACHED SOLUTION OF APPROXIMATELY 32* BE DILUTING THE FILTRATE TO APPROXIMATELY 14% P2O5 CONCENTRATION, TREATING THE FILTRATES WITH CALCIUM CARBONATE IN THE RATIO OF APPROXIMATELY 15 PARTS OF P2O5 TO APPROXIMATELY 4.7 PARTS OF CALCIUM CARBONATE TO PRODUCE A PH IN THE SOLUTION RANGING BETWEEN ABOUT 2.3 AND 3.0 AREACTING THE MIXTURE OF APPROXIMATELY 30 MINUTES, FILTERING THE RESULTANT SLURRY TO SEPARATELY RECOVER A SECOND FILTRATE OF DEFLUORINATED LIQUOR CONTAINING SUBSTANTIALLY ALL OF THE P2O5 VALUES AND THE PRECIPITATED SOLIDS AND REACTING THE DEFLUORINATED LIQUOR WITH ADDITIONAL CALCIUM CARBONNATE IN THE RATIO OF P2O5 TO CALCIUM CARBONATE OF 1 TO 1, FILTERING THE SOLIDS AFTER THE RACTION FOR APPROXIMATELY 1 HOUR TO RECOVER THE DICALCIUM PHOSPHATE PRECIPITATED SOLID MATERIAL, AND DRYING SAID SOLIDS AT A TEMPERATURE OF APPROXIMATELY 250*F. TO PRODUCE A PRODUCT ANALYZING APPROXIMATELY 20% ELEMENTAL PHOSPHORUS.