Process for purifying waste water containing ammonium sulfate
US4058591A · kind A · utility
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8Claims
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Key dates
| Filing date | Aug 26, 1975 |
| Grant date | Nov 15, 1977 |
| Priority date | — |
| Expiry date | Aug 26, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This process for purifying waste-water containing ammonium sulfate comprises reacting said waste-water with calcium oxide, calcium sulfide and ammonium sulfite; roasting the resulting precipitate to regenerate calcium oxide and calcium sulfide; and reacting sulfur dioxide with hydrogen sulfide obtained in a prior step to yield sulfur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.