Process for the treatment of waste waters containing sulfuric acid and/or ammonium sulfate
US3935100A · kind A · utility
6Cited by
6References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Jun 28, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/586
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Process for treating a waste water containing sulfuric acid and/or ammonium sulfate comprising (1) reacting said water with barium sulfide to form barium sulfate, (2) reacting the latter with carbon containing inorganic impurities, at high temperature, thereby forming barium sulfide, at least a major portion of which is recycled to step (1), and a gas which is separated, (3) dissolving in water a minor portion of the barium sulfide produced in step (2), separating the insoluble impurities therefrom and recycling at least one portion of the resulting purified solution to step (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.