Selective removal of sulfide from aqueous alkali solutions
US8858902B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 2013 |
| Grant date | Oct 14, 2014 |
| Priority date | — |
| Expiry date | May 17, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D7/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for removing sulfide from an aqueous alkali solution in which hydrogen peroxide is introduced into a sulfide-containing aqueous alkali solution associated with an alkali mineral recovery operation. The method is particularly useful for the processing of sulfide-containing aqueous alkali solutions containing NaHCO3 and Na2CO3, where bicarbonate in the sulfide-depleted alkali solution is decomposed to form Na2CO3, with concurrent evolution of gaseous carbon dioxide byproduct but without formation of gaseous H2S as a pollutant, and where Na2CO3 values are subsequently recovered from the sulfide-depleted carbonate-rich alkali solution via a crystallization operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.