Abstract
Water removal on gas bubbles (the presence of various divalent metals did not distinctly influence the removal rate) and the water sheath thickness of the bubbles increase with increasing sodium sulfate concentration in foam fractionation of divalent metal cations using lauryl sulfate. However, the presence of sodium sulfate has a negative effect on the water sheath thickness in ion flotation of metal cations with laurate collector. In ion flotation of metal complex anions with cetyltrimethylammonium collector the water removal decreases with increasing thiocyanate ligand concentration and, in relation to various metals, follows the order Cd < Zn < Cu ⩽ Co < Ni < no metal. The presence of various acids in the flotation of cobalt complexes causes the change in the water removal as follows: HClO 4 < HNO 3 < HCl < H 2SO 4 < H 3PO 4. Moreover, the surface tension of the foam separation (water removal) media was measured. In the discussion, the structure of the adsorption-hydration layer at the gas/solution interface and the interactions of collector and counterions with water molecules were considered.
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