Abstract
Benzohydroxamic acid (BHA) is a universal collector for the flotation of oxidized minerals because of its excellent selectivity. However, improving collecting efficiency of BHA still remains a challenge in mineral processing. We report herein the substituted aryl-hydroxamic acids acted as collectors for scheelite flotation to compare the collecting effect with BHA. The collecting performance of BHA, p-methyl-benzohydroxamic acid (MBHA) and p-bromine-benzohydroxamic acid (BBHA) was investigated by flotation tests. Next, the adsorption behaviors of MBHA and BBHA on scheelite surface was studied via zeta potential and X-ray photoelectron spectroscopy (XPS) measurements. In addition, the electronic effect of substituents in MBHA and BBHA molecules were studied by Density Functional Theory (DFT) calculation. On the basis of these studies, bonding groups of MBHA molecule are better electron donors than BHA and BBHA, which are responsible for the superior adsorption effect and collecting performance towards scheelite than BHA and BBHA.
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