Method for the removal of arsenic from sulfuric acid solution
US6495024B1 · kind B1 · utility
5Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2000 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Jan 26, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The object of this invention is a method by which arsenic is removed from sulfuric acid solution, in which the sulfuric add concentration is at least 300 g/l, at a temperature of 50-105° C. by reducing the arsenic in the solution with the aid of sulfur dioxide. The arsenic trioxide produced is crystallized from the sulfuric acid solution by cooling. The method is particularly suitable for use in connection with the electrolytic refining of metals, as in copper refining.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.