C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/176
C22B 15/14 (2006.01) C01G 28/00 (2006.01) C22B 3/40 (2006.01) C22B 23/06 (2006.01)
Patent
CA 1076815
ABSTRACT OF THE DISCLOSURE: A method is disclosed for removing arsenic by solvent extraction from a copper and/or nickel bearing aqueous solution containing about 100 to 600 gpl sulphuric acid. The method com- prises contacting the solution with an organic solution consis- ting of about 5 to 80% by volume of tributylphosphate in an orga- nic diluent, and subsequently stripping the arsenic from the loaded organic solution with a suitable stripping agent. Parti- cularly, when the sulphuric acid concentration in the aqueous solution is lower than 300 gpl, the organic solution advantageous- ly comprises up to about 15% of a quaternary ammonium reagent. Preferred quaternary ammonium reagents are tricaprylmethyl ammo- nium chloride and mixtures of tri-C8-C10 methylammonium chlorides.
267103
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