Abstract
In this study, a new collector for apatite flotation was synthesized by a series of reactions, including sulfation and amidation, using sodium oleate as raw material. An investigation on flotation behavior and mechanism of oleic acid amide onto apatite was carried out by micro flotation tests, zeta potential measurements, and XPS analysis. The flotation results showed that mixing sodium oleate and oleic acid amide could float apatite well in a pH 7.5–9.5 range even at the acid number of 120mgKOH/g and it exhibits better collecting capacity on apatite than sodium oleate collector. The XPS analysis data correlated with zeta potential showed that: the zeta potential of apatite become more negatively charged under neighborhood pH=8.5 and the oleic ions (C17H33COO−, (C17H33COO)22− and C17H33CONH−) in the mixing collector suspension can get chemisorbed by CaO bond formation on the apatite surface, also the moleculars (C17H33CONH2) and micelles (C17H33CONH2)m in oleic acid amide can get chemisorbed on the apatite surface by CaO or CaN bond formation.
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