Granulation of phosphatic fertilizers

Claim 1

A PROCESS FOR THE PRODUCTION OF SUPERPHOSPHATIC FERTILIZER IN GRANULAR FORM COMPRISING MIXING GROUND PHOSPHATE ROCK AND ACID IN REACTING PROPORTIONS AND OF SUCH A CONCENTRATION AS TO PRODUCE A FIRST FLOWABLE SLURRY, SUBJECTING SAID FIRST SLURRY TO A RELATIVELY SLOW ROLLING AND TUMBLING ACTION IN A FIRST ROTARY CHAMBER UNTIL THE SAME IS TRANSFORMED INTO A RELATIVELY CRUDE PARTICULATE SOLID FORM, IN A SEPARATE OPERATION MIXING THE RESULTING SOLID FORM WITH NON-ACIDIC AQUEOUS LIQUID IN EXCESS OF THAT REQUIRED TO FORM GRANULES OF THE DESIRED SIZE SO AS TO PRODUCE A SECOND RELATIVELY THIN FLOWABLE SLURRY, DELIVERING SAID SECOND SLURRY TO A SECOND ROTARY CHAMBER, SUPPLYING MOISTURE ABSORBING MATERIAL IN FINELY DIVIDED FORM TO SAID SECOND ROTARY CHAMBER WHEREIN IT IS MIXED WITH SAID SECOND SLURRY AND SUBJECTING THE RESULTING MIXTURE TO A RELATIVELY RAPID ROLLING, TUMBLING AND DRYING ACTION TO TRANSFORM IT INTO GRANULAR FORM.