METHOD OF ARSENIC EXTRACTION FROM SOLUTIONS Russian patent published in 1995 - IPC

FIELD: chemical technology. SUBSTANCE: method involves contacting solution to be refined with sorbent which granulated with binder titanium hydroxide calcined at phosphate ion-exchange form at the molar ratio P (V) Ti (IV) in the solid phase (0.7-1.4):1, mainly at dynamic regime, at solution filtration rate through column 2-4 specific volume/h following desorption of ions As (III) with solution H₂SO₄ at concentration 150-300 g/l at 40-60 C, and that of ions As (V) with solution H₂SO₄ at concentration 25-50 g/l with addition of Na₂CO₃ or Na₂S₂O₅ at concentration 0.5-1.0 mole/l at 60-80 C and arsenic conversion to the solid phase by treatment of acid eluates with calcium polysulfide solution at concentration 45-55 g/l. EFFECT: high degree of arsenic extraction, minimal sorbent and product loss, absence of washing sewage. 5 cl, 2 tbl