Process for regeneration of electrolytes from pickle liquor, in particular of NA2S04 from pickle liquor for stainless steel
US6506294B1 · kind B1 · utility
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4Claims
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Key dates
| Filing date | Feb 15, 1996 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Feb 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25F7/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.