Abstract
Studies have been carried out for extraction of Cu, Ni, Co, Zn and Mn with simultaneous avoidance of iron dissolution during leaching of manganese nodules in an aqueous SO 2–H 2SO 4–(NH 4) 2SO 4 system. The leaching parameters such as sulphuric acid concentration, ammonium sulphate concentration, time and pulp density were varied to study their effect on extraction of metals and precipitation of iron. It was observed that the presence of both sulphuric acid and SO 2 was required for maximum recovery of Cu, Ni, Co, Zn and Mn. The iron in solution decreased with increase in ammonium sulphate concentration. The optimum conditions established for maximum metal extractions were: pulp density 20%, time 3 h, temperature 363 K, SO 2 60 g l −1, sulphuric acid 3.0% (v/v) and ammonium sulphate 100 g l −1. Under these conditions the recoveries from a typical nodule sample were: 88.5% Cu, 99.8% Ni, 91.8% Co, 97.8% Zn, 99.6% Mn with iron extraction of 2.4%. Nodules containing different percentage of metal contents were also tested under the established conditions and it was observed that the dissolution of iron varied between 2.4 and 4.9% with no significant variations in recoveries of Cu, Ni, Co, Zn and Mn.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.