FOAM FRACTIONATION OF NEGATIVE-IONS

Negatively charged ions can be separated successfully by foam fraction ation. Among them, free cyanide ions were removed by cetyl trimethyl a mmonium bromide or a similar compound. At low concentrations (<5 mg/L) , quantitative removal of free cyanide ions was observed. Further obse rvations revealed that when the concentration was increased to 57 mg/L , a reduction in concentration equivalent to 47% could be achieved. Fi nally, a correlation between cyanide separation and surfactant concent ration was found.