Flotation performance of anisic hydroxamic acid as new collector for tungsten and tin minerals

Abstract

In order to improve the recovery of tungsten ores containing tin minerals, anisic hydroxamic acid (p-methoxy benzohydroxanic acid, PMOB) was synthesized and introduced as novel collector in the flotation of scheelite, wolframite and cassiterite. The flotation performance and adsorption mechanism were investigated by micro/batch flotation, zeta potential measurements and density functional theory (DFT). The micro flotation results showed that the recoveries of scheelite, wolframite and cassiterite using PMOB as collector are 97.45%, 95.77% and 90.08%, respectively, and the corresponding recoveries are 91.00%, 84.30% and 84.67% for benzohydroxamic acid (BHA). The batch flotation results revealed that the collector dosage could be reduced by about 45% for PMOB compared with BHA, in the case of similar flotation indicators. Zeta potential measurements indicated that PMOB could be adsorbed on the mineral surfaces by chemisorption. Moreover, density functional theory (DFT) calculation results showed that the substituent group −OCH₃ endues PMOB stronger electron donation ability and hydrophobicity compared with benzohydroxamic acid (BHA), p-methyl benzohydroxamic acid (PMB) and p-hydroxyl benzohydroxamic acid (PHB).

Keywords

flotation / hydroxamic acid / scheelite / wolframite / cassiterite

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