Characterisation and recovery of non-ferrous metals met in a copper-slag processed by flotation

peer reviewedDetailed process oriented characterisation on representative samples from plant survey of the slag flotation plant belonging to Aurubis, Bulgaria has been realised in order to evaluate the mineralogical occurrences of Cu, Ni, Mo and Co bearing phases. The slag subjected to flotation consisted in majority of fayalite, magnetite-iron oxides and a glass-like phase. Ni and Mo have been found to be closely associated to magnetite and fayalite. The tailing from the slag flotation has been subjected to sulphation roasting followed by water leaching as a hydrometallurgical means to recover the remaining Cu, Mo, Ni and Co. Based on the various sulphation roasting conditions (acid dosage, duration, temperature) copper, nickel and cobalt were brought to solution to a different extent. Molybdenum was the most difficult to be rendered soluble due to its close association with iron, suspected to form an insoluble compound with it. Sulphation roasting performed at 350ºC has secured the best extraction degree for Cu, Mo and Co, while maximum recovery of Ni has been documented when roasting was done at 150°C

Behaviour of Impurities during Electron Beam Melting of Copper Technogenic Material

The current study presents the electron beam melting (EBM) efficiency of copper technogenic material with high impurity content (Se, Te, Pb, Bi, Sn, As, Sb, Zn, Ni, Ag, etc.) by means of thermodynamic analysis and experimental tests. On the basis of the calculated values of Gibbs free energy and the physical state of the impurity (liquid and gaseous), a thermodynamic assessment of the possible chemical interactions occurring in the Cu-Cu2O-Mex system in vacuum in the temperature range 1460–1800 K was made. The impact of the kinetic parameters (temperature and refining time) on the behaviour and the degree of removal of impurities was evaluated. Chemical and metallographic analysis of the obtained ingots is also discussed

Characterisation and recovery of non-ferrous metals met in a copper-slag processed by flotation

peer reviewedDetailed process oriented characterisation on representative samples from plant survey of the slag flotation plant belonging to Aurubis, Bulgaria has been realized in order to evaluate the mineralogical occurrences of Cu, Ni, Mo and Co bearing phases. The slag subjected to flotation consisted in majority of fayalite, magnetite-iron oxides and a glass-like phase. Ni and Mo have been found to be closely associated to magnetite and fayalite. The tailing from the slag flotation has been subjected to sulphation roasting followed by water leaching as a hydrometallurgical means to recover the remaining Cu, Mo, Ni and Co. Based on the various sulphation roasting conditions (acid dosage, duration, temperature) copper, nickel and cobalt were brought to solution to a different extent. Molybdenum was the most difficult to be rendered soluble due to its close association with iron, suspected to form an insoluble compound with it. Sulphation roasting performed at 350ºC has secured the best extraction degree for Cu, Mo and Co, while maximum recovery of Ni has been documented when roasting was done at 150°C

Process Oriented Characterisation of Copper Slag Processed by Flotation in View Metals Recovery

peer reviewedProfound process oriented characterisation on samples collected during plant survey of the slag flotation plant belonging to Aurubis AD, Bulgaria has been realized in order to evaluate the form under which Cu, Ni, Mo and Co bearing phases occurred and likewise their mineralogical composition. The slag subjected to flotation consisted in majority of fayalite, magnetite-iron oxides and a glass-resembling phase. Ni and Mo have been found to be closely associated to iron-bearing phases. The flotation tailings sample has been subjected to sulphation roasting followed by water leaching as a hydrometallurgical route to recover the remaining Cu, Mo, Ni and Co. Based on the various sulphation roasting process conditions (acid dosage, duration, temperature), copper, nickel and cobalt were brought in solution to a different extent. Sulphation roasting performed at 350 °C has secured the best extraction degree for Mo and Co, while maximum recovery of Ni and Cu has been documented when roasting was done at 150 °C and 450 °C respectively. EDS-SEM observations of various products do support the experimental findings