Method for reclaiming metal sulfate-containing waste sulfuric acid
US6337061B1 · kind B1 · utility
17Cited by
6References
3Claims
0Family size
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Key dates
| Filing date | Mar 28, 1995 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Mar 28, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
For the purpose of efficiently and easily regenerating a sulfuric acid solution having a high concentration and a low impurity content from a metal sulfate-containing waste sulfuric acid solution and waste liquor formed during acid cleaning which are discharged from titanium (IV) oxide-production process carried out according to the sulfuric acid method, titanium present in the metal sulfate-containing waste sulfuric acid solution is removed through a solvent-extraction treatment and then the solution obtained after the solvent-extraction is subjected to a diffusive dialysis treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.