Mineral—collector—starch constituent interactions

Abstract Adsorbabilities of sodium myrislate collector and starch and its constituents, amylose and amylopectin, on several minerals viz., kaolinite, corundum, hematite and calcite have been studied. The influences of collector and starch and its constituents on the adsorbsbility of the other have been specially investigated to elucidate the mechanism of depression by the latter. Three distinctly different mechanisms have been found to be operative or plausible: a) Amylopectin is adsorbed on mineral surfaces in competition with the collector, thereby decreasing the adsorption of the latter. The second mechanism (b) viz, that of synergistic co-adsorption of collector with starch helices to form clahthrate (thus accounting for reduced hydrophobicity in spite of increased collector adsorption) has been found to be valid for amylose only. Co-adsorption is possible by another mechanism (c) involving binary interactions between collector, starch and starch constituents and inorganic ions in bulk and on lattice sites. This case need not represent competitive or synergistic adsorption, and depression arises merely on account of hydrophille and massive starch molecules overwhelming or shrouding hydrophobic tails of collector molecules, both kind of molecules being independently anchored to the mineral surface and chemically interacting with each other.

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