Abstract
Adsorption studies of sodium humate, extracted from lignite, on Indian iron ore fines have been carried out to understand the influence of pH in the range 6.0 to 11.0 on adsorption processes. The adsorption of humate ion on iron ore surfaces decreases as the pH of the slurry increases. The transition in the adsorption of humate ion at pH 8.2 is due to a reversal of the surface charge of the ore fines, and has been correlated with the zero point of charge. Infrared spectral studies show that at low pH the humate ion is chemisorbed via the COO − ion in a chelating bidentate configuration whereas at basic pH both the phenolic oxygen atom and the COO − ion are coordinatively bonded to the Fe 3+ ion.
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