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

FIELD: chemical technology. SUBSTANCE: method involves preparing zinc scale an aqueous suspension at weight ratio ZnO : H₂O = 1:(1-3). Suspension is kept for 0.5-4 h at stirring followed by addition of phosphoric acid firstly at amount Zn : P₂O₅ = 0.28-2 at specific rate 60-1820 kg P₂O₅/m³ pulp x h and exposition at stirring for 0.5-8 h and the following addition of nitric acid at amount Zn : NO₃ = 0.4-5 at specific rate 20-720 kg NO₃/m³ pulp x h and exposition for 0.5-5 h at temperature of reaction mixture 50-70 C followed by separation of mechanical suspensions containing in scale zinc. EFFECT: improved method of producing, economy, safety, high quality of product. 4 cl