Manufacture of complex fertilizers
阅读：255发布：2022-02-12
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1. A METHOD OF MAKING FERTILIZER OF WHICH SUBSTANTIALLY ALL THE PHOSPHATE ION IS AVAILABLE AS PLANT FOOD, FROM PHOSPHATE OF FERTILIZER GRADE COMPRISING CALCIUM PHOSPHATE BY THE METHOD IN WHICH NITRIC ACID IS REACTED WITH THE PHOSPHATE, THE PRODUCT IS NEUTRALIZED BY AMMONIATION, AND THE AMMONIATED PRODUCT IS CONVERTED BY CARBONATATION, WHICH CONSISTS IN ITS ESSENTIAL STEPS OF REACTING PHOSPHATE OF FERTILIZER GRADE CONTAINING CALCIUM PHOSPHATE WITH NITRIC ACID, NEUTRALIZING THE FREE ACIDITY OF THE REACTION MASS BY INTRODUCING AMMONIA UNTIL THE PH IS IN THE RANGE 4.5 TO 6, ADDING CO2 AND ADDITIONAL AMMONIA IN A PROPORTION OF 0.1 TO 0.4 MOLE CO2 TO EACH 2 MOLES NH3 UNTIL THE PH ATTAINS 7, ADDING ADDITIONAL CO2 AND AMMONIA TO THE REACTION MASS OF PH7 IN A PROPORTION OF 1.05 TO 1.5 MOLES OF CO2 TO EACH 2 MOLES NH3 UNTIL THE CONVERSION IS COMPLETED, MAINTAINING THE TEMPERATURE IN THE FOREGOING STEPS BELOW BOILING INTRODUCING A POTASSIUM SALT AFTER THE AMMONIATION BEGINS, DRYING THE PRODUCT OF THE SUCCESSIVE AMMONIATIONS AND CARBONATATIONS, AT A TEMPERATURE BELOW 70*C., TO ABOUT 0.5 TO 1% WATER CONTENT WHILE EXCLUDING HUMID AIR, AND STORING THE PRODUCT WITH EXCLUSION OF HUMID AIR.
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