The experiment research on iron removal from kaolin by using mixed collecting agent

Flotation experiment of Fe-beaeing minerals in kaolin is carried out. Amine and and active agent of saponified oleic acid are combined to be used as collector.Occurrence analysis of iron shows that adoption of phased-cationic / anionic collector results in electrostatic adsorption of iron silicate by octadecylamine emulsion at pH=8-10 and capture of iron oxide by surface activation of saponified oleic acid-a small amount of sodium dodecyl sulfate at pH=5-7.Ultimately natural whiteness of the kaolin concentrates increases to 85%-86%,whiteness after calcination(1 200℃)to 88%-89%.