Electrolytic recovery of copper from oxidizable cupriferous material
Abstract
Abstract OXIDIZABLE IRON-BEARING CUPRIFEOUS MATERIAL IS LEACHED WITH A SULFURIC ACID SOLUTION CONTAINING HEXAVALENT CHROMIUM IONS, E.G. CHROMIC ACID OR A DICHROMATE. THE LEACH SOLUTION AFTER SEPARATION FROM UNDISSOLVED RESIDUE IS HYDROLYZED BY HEATING UNDER PRESSURE AT A TEMPERATURE ABOVE 130*C. TO PRECIPITATE IRON AS A BASIC SULFATE SALT. THE IRON PRECIPITATE IS SEPARATED, AND THE RESIDUAL SOLUTION IS SUBJECTED TO A FIRST BIFLUID ELECTOLYSIS TO ELECTROWIN COPPER AND TO REGENERATE SULFURIC ACID AND REOXIDIZE TRIVALENT CHROMIUM IONS TO HEXAVALENT. FORM. ANOLYTE DISCHARGED FROM THE FIRST ELECTROLYSIS IS SUBJECTED AS ANOLYTE IN A SECOND BIFLUID ELECTROLYSIS TO OXIDIZE REMAINING TRIVALENT CHROMIUM TO HEXAVALENT FORM, AND THEREAFTER THE SOLUTION IS RECYCLED TO THE LEACHING OPERATION.
Inventors
- 👤 F Horton
- 👤 T Morris
- 👤 F Christman
Bibliographic Details
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