Process for regeneration of electrolytes from pickle liquor, in particular of NA2S04 from pickle liquor for stainless steel

摘要

A process for regeneration of electrolytes, in particular Na2SO4, from waste pickles created during picking of stainless steel, in particular stainless steel strips. The electrolytes are regenerated by adding NaxHySzOv in an acid solution whereby Cr6+ is reduced to Cr3+. Variables x, y, z and v having the following values: x=0 to 2, y=0 to 2, z=1 to 6, v=2 to 6.