Mechanism of the activating and depressing effects of sodium fluosilicate in the flotation of minerals by oleate soap

Autor: G. S. Berger, E. V. Bulatova
Rok vydání: 1969
Předmět:
Zdroj: Soviet mining science. 5:452-456
ISSN: 1573-8736
0038-5581
DOI: 10.1007/bf02501415
Popis: 1. Study of the flotabilities of fluorite, topaz, beryl, albite, and quartz by sodium oleate in the presence of sodium fluosilicate reveals the feasibility of selective flotation of fluorite and topaz from beryl, albite, and quartz by means of sodium fluosilicate. 2. The authors have studied attachment of the collector to mineral surfaces under these flotation conditions, determined the surface fonms of the reagents in the IR spectra, and elucidated (to a first approximation) the mechanism of the flotation effect of sodium fluosilicate. 3. Sodium fluosilicate has differing flotation effects. It reduces the pH of the medium and promotes desorption of the collector from the surfaces of certain minerals and conversion of the ionic forms of the collector to molecular forms; the silica gel, formed in the solution by hydrolysis of the SiF 6 2\t- ion, also acts on the mineral surfaces by selective attachment of these ions on them. It has differing effects on the minerals. In contrast to the hypothesis that SiF 6 2− has a depressing effect, it has been shown for the investigated minerals that its attachment on the surface does not impair flotation. The depressing effect of sodium fluosilicate is due to silica gel, formed by hydrolysis of this salt. It is most probable that the SiF 6 2− anion has a protective effect in the case of fluorine-containing minerals (for example, fluorite and topaz), which prevents attachment of silica gel on the surface (such attachment making the latter markedly hydrophilic). 4. It is shown that under these conditions conversion of the ionic forms of the collector on the mineral surfaces to molecular forms is not the factor characterizing the flotabilities of these minerals.
Databáze: OpenAIRE
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