Abstract
Apolar reagents, used for the flotation of various minerals, contain a significant amount of aromatic hydrocarbons. In this paper, the authors study the flotation activity and thermodynamic adsorption functions of alkylated and polymethylated benzenes with mono- and diisomeric substituents containing various functional groups in the benzene ring. Aromatic hydrocarbons are used widely for the commercial flotation of graphite. The change in free energy and entropy for the adsorption of hydrocarbons with small surface packing at 363/sup 0/K were calculated from the chromatographic data. Benzene is shown to be a poor reagent for the flotation of graphite. Among other conclusions drawn, alkylation, polymethylation and halogenation of benzene increases the thermo-dynamic adsorption functions and flotation activity.
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