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The influence of chemical additives on surface charge and hardness of hematite

Pitchai, N and Nayak, UB and Lahiri, AK (1991) The influence of chemical additives on surface charge and hardness of hematite. In: International Journal of Mineral Processing, 31 (1-2). pp. 139-144.

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Official URL: http://dx.doi.org/10.1016/0301-7516(91)90010-G


The zeta potential of high-purity hematite at pH 6 and in a 10−3N NaCl solution has been determined at different concentrations of acetone using the streaming potential technique and the results correlated with the microhardness of the mineral. The zeta potential has been found to decrease as the hardness increases reaching a minimum at 10 cc per litre concentration of acetone when the hardness reaches a maximum. The results have been explained on the basis of competitive adsorption of chloride ions and acetone molecules at low concentrations of acetone and coadsorption of both species above 10 cc per litre concentration. Acetone in distilled water and 10−3N NaCl in distilled water decrease the microhardness of hematite individually between pH 5 to 7 and in combination increase the microhardness reaching a maximum at pH 6.

Item Type: Editorials/Short Communications
Publication: International Journal of Mineral Processing
Publisher: Elsevier science
Additional Information: Copyright of this article belongs to Elsevier science.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 07 Dec 2010 07:01
Last Modified: 07 Dec 2010 07:01
URI: http://eprints.iisc.ac.in/id/eprint/34239

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