A method for neutralizing sulfuric acid containing zinc ion.

摘要

The invention relates to a method for neutralizing a sulfuric acid solution containing predominantly Zn ion. In the method of the invention at least one compound selected from chlorine-containing compounds of Na ion, K ion, Mg ion, Ca ion, and NH4 ion in an amount at least chemically equivalent to SO4 ion contained in the solution is added to the sulfuric acid solution. Then the sulfuric acid solution is brought into contact with an organic solvent composed of one or more species selected from oxygen-containing organic solvents and alkylamine organic solvents to extract Zn ion from the sulfuric acid solution as a chloride complex to the organic solvent. The sulfuric acid solution after extraction of Zn ion may be further treated by addition of an oxidizing agent or by an electrochemical means to convert Fe<2><+> into Fe<3><+> ion and brought into contact with a second organic solvent (B) composed of one or more species selected from oxygen-containing organic solvents and alkylamine organic solvents. In that manner Fe ion is extracted from the sulfuric acid solution as a second chloride complex to the second organic solvent (B).