A METHOD OF MAKING PHOSPHORIC ACID AND GYPSUM WHICH COMPRISES FORMING A FIRST FLUID REACTION MEDIUM COMPRISING THE PHOSPHORIC ACID PRODUCT OF THE PROCESS, DIVIDING THE PHOSPHATIC RAW MATERIAL, IN POWDER FORM, INTO MAJOR AND MINOR FRACTIONS, MIXING THE MAJOR FRACTION WITH THE FIRST FLUID REACTION MEDIUM, MIXING MORE SULFURIC ACID WITH THE FIRST FLUID REACTION THAN IS REQUIRED TO REACT WITH THE PHOSPHATIC RAW MATERIAL THEREIN TO FORM GYPSUM FORMING A SECOND FLUID REACTION MEDIUM COMPRISING THE PHOSPHORIC ACID PRODUCT OF THE PROCESS, TRANSFERRING PRODUCT FORMED IN THE FIRST REACTION MEDIUM TO THE SECOND REACTION MEDIUM AND MIXING IT THEREWITH, MIXING THE MINOR FRACTION OF PHOSPHATIC RAW MATERIAL WITH THE SECOND FLUID REACTION MEDIUM, AND SEPARATING PHOSPHORIC ACID FROM THE GYPSUM.