C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/289, 53/328,
C22B 15/00 (2006.01)
Patent
CA 1114175
ABSTRACT OF THE DISCLOSURE Zinc, copper and cadium are recovered from their ferrites by subjecting the ferrites to a sulfuric acid bearing solution in the presence of potassium, sodium or ammonium ions under atmospehric conditions at 80-105°C to precipitate the iron present in the ferrites as jarosite, separating at least a portion of the jarosite-bearing solid material from the solution before recycling the solution to a neutral leach, from which a copper and cadium bearing solution is recovered and to which acid and clacine are also fed, feeding the solid obtained from the neutral leach to the said ferrite treatment stage classifying the solid obtained from the neutral leach into a finer and coarser fraction, feeding the finer fraction to the ferrite treatment stage, comminuting the coarser fraction by grinding, leaching or milling and recycling the comminuted fraction to the process.
309320
Bjorkqvist Lars-Goran
Gisler Raija-Leena
Liukkonen Simo S.
Rastas Jussi K.
Fetherstonhaugh & Co.
Outokumpu Oy
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