Process for working up copper cementate sludges
US4104055A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1974 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Mar 18, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for recovering metallic values from arsenic-containing copper cementate sludges. The cementate is admixed with lime in an amount sufficient to form calcium sulfate by reaction with any water-soluble sulfate present in the cementate, and calcium arsenate from the arsenic present in the cementate. The admixture is roasted in an oxygen-containing atmosphere at a temperature above about 300.degree. C, to oxidize the metallic values to a state in which said values are soluble in aqueous acid. The roasted material is leached with aqueous acid to dissolve said values. The values can be recovered from the solution produced in the leaching step by known procedures. By the process of the invention, polluting by arsenic is prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.