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Interaction of guar gum with hydrophobic solids

Rath, RK and Laskowski, JS and Subramanian, S (1999) Interaction of guar gum with hydrophobic solids. In: 3rd UBC-McGill Bi-Annual International Symposium on Fundamentals of Mineral Processing held at the 38th Annual Conference of Metallurgists of CIM, AUG 17-19, 1999, Quebec, Canada.

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Official URL: http://www.immage.org/abstract.asp?Line=81341


The interaction of guar gum with the hydrophobic solids namely talc, mica and graphite has been investigated through adsorption, electrokinetic and flotation experiments. The adsorption densities of guar gum onto the above hydrophobic minerals show that they are more or less independent of pH. The adsorption isotherms of guar gum onto talc, mica and graphite indicate that the adsorption densities increase with increase in guar gum concentration and all the isotherms follow the as L1 type according to Giles classification. The magnitude of the adsorption density of guar gum onto the above minerals may be arranged in the following sequence: talc > graphite > mica The effect of particle size on the adsorption density of guar gum onto these minerals has indicated that higher adsorption takes place in the coarser size fraction, consequent to an increase in the surface face-to-edge ratio. In the case of the talc and mica samples pretreated with EDTA and the leached graphite sample, a decrease in the adsorption density of guar gum is observed, due to a reduction in the metallic adsorption sites. The adsorption densities of guar gum increase with decrease in sample weight for all the three minerals. Electrokinetic measurements have indicated that the isoelectric points (iep) of these minerals lie between pH 2-3, Addition of guar gum decreases the negative electrophoretic mobility values in proportion to the guar gum concentration without any observable shift in the iep values, resembling the influence of an indifferent electrolyte. The flotation recovery is diminished in the presence of guar gum for all the three minerals, The magnitude of depression follows the same sequence as observed in the adsorption studies. The floatability of EDTA treated talc and mica samples as well as the leached graphite sample is enhanced, complementing the adsorption data, Possible mechanisms of interaction between the hydrophobic minerals and guar gum are discussed.

Item Type: Conference Paper
Publisher: Canadian Institute of Mining, Metallurgy and Petroleum
Additional Information: Copyright of this article belongs to Canadian Institute of Mining, Metallurgy and Petroleum.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 16 Mar 2012 10:31
Last Modified: 16 Mar 2012 10:31
URI: http://eprints.iisc.ac.in/id/eprint/43882

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