Home – Home – Jornals – Chemistry for Sustainable Development 2015 number 3

Sorption of indium, iron (III) and zinc ions from multicomponent solutions within a broad range of acidity (4-500 g/dm³ H₂SO₄) on weakly acidic cationites with functional groups Purolite S955 (diphosphonic (-PO₃H₂) ₂, sulphonic (-SO₃H), carboxylic (-СООН)), Lewatit TP260 (CH₆NO₃P - aminomethylphosphonic), Lewatit TP272 (bis-(2,4,4)trimethylpentylphosphinic - C₁₆H₃₅O₂P) was studied. It was established that the sorption value for indium and iron (III) ions is always high (88-99 %), the degree of zinc ion recovery (4-350 g/dm³ H₂SO₄) decreases within the ranges 87.0-2.0 % (S955) and 56.0-0.1 % (TP260), while iron (II) ions (4-150 g/dm³ H₂SO₄) - from ~100 to ~50 %. From the multicomponent solution (C₀ = 4.4 mmol/dm³; 100 g/dm³ Н₂SO₄; L/S = 8; t = 25 min), indium is best separated from iron (D_р = 2.8) and zinc (D_р = 7.2) on Purolite S955 ionite - recovery degree reaches 95 %. Due to this, weakly acidic cationite Purolite S955 can be used for selective isolation of indium by sorption from acidic solutions from leaching of zinc concentrates.