Separation of Germanium and Arsenic from Solutions by Flotation
The selective recovery of germanium from arsenic ions in dilute aqueous solutions (concentration order of 10 ppm) by dispersed-air flotation was investigated in bench scale experiments. The separation was accomplished with the initial use of an activator, such as pyrogallol and then of a cationic surfactant, as laurylamine, giving germanium recoveries of over 95% at pH 7. The stoichiometric mechanism of ion flotation was examined by varying the concentrations of activator and surfactant, showing a mole ratio of (Ge) : (pyrogallol) : (laurylamine) equal to 1 : 3: 2. Parallel work on adsorbing colloid flotation (a technique that was earlier attempted successfully for arsenic removal alone) was proved effective only to concentrate both ions from their aqueous mixtures in dilute form. In the latter, ferric hydroxide was the carrier floc and sodium oleate the collector, at a ratio of60:15 ppm.
Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Θετικών Επιστημών, Τμήμα Χημείας
International Journal of Mineral Processing, vol.21  p.83-92 [Published Version]
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