Abstract
In this study, monosodium phosphate (MSP) was used as a regulator for simultaneous separation of quartz and dolomite from magnesite with dodecylamine (DDA) as a collector via reverse flotation. The results of micro-flotation tests indicated that MSP had a selective activation effect on the dolomite flotation, which made the flotation behavior of dolomite similar to that of quartz under DDA as a collector. Further, batch flotation results showed that MSP could effectively simultaneous removal of quartz and dolomite from magnesium-bearing carbonate ores. Contact-angle tests revealed that MSP could selectively increase the contact angle of dolomite, resulting in the high hydrophobicity of dolomite in the presence of DDA, but it has no such effect on magnesite and quartz surface. Field emission scanning electron microcopy (FESEM) with an energy dispersive X-ray spectrometer (EDS) detection suggested that MSP was mainly adsorbed on dolomite and changed its surface characteristics rather than quartz and magnesite. Based on the Fourier transform infrared (FTIR) analysis, MSP could selectively improve the adsorption of DDA onto the dolomite surface.
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