Organic colloids and their utilisation in flotation
Abstract
By means of numerous examples taken from experimental work the author shows the falsity of the view which considers organic protective colloids as flotation poisons or in any case as substances possessing only the function of depressing minerals in flotation. It has been found that such colloid as casein possesses good collecting properties with respect to quartz, feldspar, apatite, and does not collect sulphides. Gelatine has analogous properties. Tannin has proved to be a selectively acting depressor with respect to galena, but not depressing zinc-blende, chalcopyrite, and other sulphides under the same conditions. By means of protective organic colloids it has been found possible to satisfactorily divide many mixtures of minerals, both sulphides and non-sulphides. These so interesting properties of organic colloids in flotation, discovered when studying them more closely, bear witness to the necessity of undertaking systematical investigations of this question.
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References
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