Recovery of Co+2 Ions from Aqueous Solutions by Froth Flotation. Part II. CoS Precipitation
Cobalt ions have been recovered from aqueous solutions by dispersed-air flotation in acidic conditions. The preliminary step of precipitation as cobalt sulfide using Na2S is kinetically limited, with only approximately 70% of the cobalt ions being recovered. Recoveries increase considerably under alkaline conditions. where CO(OH)2 also precipitated. Several collectors have been tested: cetyl trimethyl ammonium bromide, sodium dodecyl sulfate, cetyl pyridinium chloride, and dodecylamine; dodecylamine was found to be the most efficient. The gas flow rate was found to affect the process, with a flow rate corresponding to a superficial gas velocity of 0.1 cm/s yielding maximum recoveries; any further gas flow rate increase resulted in lower recoveries. An increase in column height was found to have an adverse effect on CoS recovery.
Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Θετικών Επιστημών, Τμήμα Χημείας
Separation Science and Technology, vol.30 no.2  p.263-284 [Published Version]
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