METHOD OF PRODUCING MULTIPURPOSE FERTILIZER WITH BIOACTIVE MASS Russian patent published in 1997 - IPC

FIELD: fertilizers. SUBSTANCE: invention deals with organomineral fertilizers based on brown coal. In a method where finely disintegrated brown coal is mixed with bioactive additive, the former, prior to be disintegrated, is treated with alkali solution and then consecutively mixed with mineral fertilizer and bioactive additive - aqueous suspension of yeast, milk, and/or sugar industry waste Resultant mixture is granulated and dried. According to invention, aqueous KOH solution is used, granulation is conducted with plasticizer added, alkali treatment and mixing of components are conducted at 20-25 C, and granules are dried at 60-80 C. As plasticizer, ammonium nitrate and urea solution can be utilized in quantity up to 2% based on total fertilizer weight. EFFECT: improved preparation procedure. 7 cl