Method for treating waste water used in alkali metal hydroxide manufacturing processes
US6123853A · kind A · utility
2Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1999 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Oct 14, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method to process waste water by removing metals, such as nickel or iron during the production of alkali metal hydroxides comprising the steps of: mixing the waste water with a cell liquor and blending the two fluids, magnetically removing up to 33% of the metals present in the solution from blended fluids using a first magnet prior to evaporation, flashing and cooling of the blended fluids, and then magnetically removing an additional amount of metals from the resultant more concentrated caustic solution using with a second magnet prior to filtration of the more concentrated caustic solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.