Process for the treatment of acidic waste liquid containing dissolved salts
US4006080A · kind A · utility
4Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Oct 2, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for the treatment of aqueous sulphuric acid solutions of a metal salt or salts containing ferrous sulphates wherein the pH value of the solution is adjusted by the addition of a calcium compound to selectively precipitate calcium sulphate after which the precipitated calcium sulphate is separated and calcined before adjusting the pH of the mother liquor to a value in the range 7 to 9 by the addition of a calcium-containing compound to precipitate there from solid metal compounds which are then separated and/or calcined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.