METHOD OF CLEAR, LIQUID COMBINED FERTILIZER PRODUCING Russian patent published in 2001 - IPC

FIELD: production of fertilizers. SUBSTANCE: invention relates to method of production of liquid combined fertilizers. Method of production of clear, liquid combined fertilizers involves neutralization of wet-process phosphoric acid with mass part of P₂O₅ 50-52% with potassium-containing reagent and addition of sequestering agent in the amount 0.5-5.0% of clear, liquid combined fertilized to wet-process phosphoric acid before neutralization followed by addition macroelements and trace elements. Organic compounds of the group including hydroxyethylidenediphosphonic acid, nitriletrimethylenephosphonic acid, diethylenetriamihepentaacetic acid, ethylenediaminedisuccinic acid, EDTA and dihydroxybutylenediaminetetraacetic acid are used as sequestering agent. Trace elements are added to clear, liquid combined fertilizer composition as chelates with compounds taken among the same group. Method ensures to use low-priced phosphorus-containing raw and obtain stable liquid combined fertilizers. EFFECT: improved method of production, simplified technology. 5 cl, 3 ex