ORGANIC OR INORGANIC COMPOSITE FERTILIZER AND METHOD FOR PREPARING THE SAME

摘要

PURPOSE: An organic or inorganic composite fertilizer and a method for preparing the same is provided which continuously erupts the alkaline fertilizer ingredients and improves acid soil, are provided. CONSTITUTION: The method comprises steps of: (i) reacting fly ash with a KOH solution at a concentration of not less than 3N in a weight ratio of 1:1.5-5 at a temperature of 60-200 deg.C for 0.5-2 hour; (ii) filtering the reaction product of the step (i) to separate the excessive KOH from residuals; (iii) adding nitric acid and phosphoric acid to the residuals in a weight ratio of 1:2-3 to adjust the pH to be 8-12; and (iv) after making a molded body from the paste obtained from the step (iii), drying or sintering the molded body at a temperature of 100-600 deg.C.