Apparatus and method for treating sesquisulfate waste streams
US6126702A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1998 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Mar 9, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D5/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The specification discloses an apparatus and method for treating a slurry containing sodium sesquisulfate to recover sulfate and acid constituents therefrom. The apparatus includes a treatment vessel having a separation wall delineating a clarifying zone and a mixing zone. Slurry containing sesquisulfate crystals is introduced into the mixing zone along with water and the material is mixed to promote dissolution of the crystals and formation of sodium sulfate solids. Sodium sulfate solids are collected in a lower portion of the treatment vessel and conveyed out of the vessel, and liquid from the clarifying zone is conducted from an upper end of the treatment vessel to a conventional liquid processing unit. Treatment of a sesquisulfate-containing slurry in accordance with the invention provides sodium sulfate containing little or no sesquisulfate crystals thereby reducing the need for vacuum filtration or other expensive separation techniques to recover sulfuric acid and sodium sulfate solids from the slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.