METHOD OF ZINC-NITRATE-PHOSPHATE CONCENTRATE PRODUCING Russian patent published in 1997 - IPC

FIELD: chemical technology, inorganic chemistry. SUBSTANCE: method involves preparing an aqueous suspension of zinc oxide at weight ratio ZnO : H₂O = 1:(1-3) followed by its addition to phosphoric acid at specific rate 400-8900 kg Zn/m³H₃PO₄ x h at 50-80 C. Then reaction mixture is kept at stirring for 10-120 min and nitric acid is added at specific rate 80-2500 kg NO₃/m³ pulp x h at 50-60 C followed by exposition at stirring for 10-60 min. Method is used for producing phosphatic concentrates used in industry. EFFECT: high quality, decreased loss of reagents and cost, broadened raw base. 4 cl, 1 tbl