Flotation behaviour of huntite (Mg3Ca(CO3)4) with anionic collectors

In this study, flotation behaviour and electrokinetic properties of huntite were determined in the presence of anionic collectors such as potassium oleate, and Flotinor FS-2. The effects of common ions that are expected in flotation pulps such as Mg2+ and Ca2+ were studied. The influences of pH and modifying reagents like sodium silicate (Na2SiO3·5H2O) and carboxymethyl cellulose (CMC) on surface properties of huntite were also examined. Electrokinetic measurements showed that isoelectric point (i.e.p.) of huntite was around 8.0. Surface charge of huntite becomes positive in the presence of 10−2 M of MgCl2 and CaCl2 at all pH values. According to micro-flotation test results, potassium oleate is more efficient compared with Flotinor FS-2. Mg2+ and Ca2+ ions have detrimental effect on the floatability of huntite. Na2SiO3 was seen to have no significant effect on the floatability of huntite. Flotation experiments with CMC indicated that it acts as a depressant on huntite.