<報文>スチレンホスホン酸によるSnO_2微粒子の浮選に関する基礎的研究

概要

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Flotation and some related surface chemical properties such as zeta potential, adsorption of collector and coagulation of suspensions, were studied using fine particles of artificial SnO_2 (chemical reagent) and styrene phosphonic acid (SPA) as a collector. The results obtained are summarized as follows. 1. The isoelectric point of SnO_2 was found to be pH 4,in good agreement with literature values on natural and artificial samples. The zeta potential of SnO_2 shifted negatively with increasing SPA concentration, indicating that SPA anions are specifically adsorbed on SnO_2 surfaces. 2. The adsorption density of SPA on SnO_2 increased with a decrease of solution pH, showing a maximum at pH 2-3. The adsorption of SPA at pH 3 tended to increase beyond a closed packed monolayer adsorption. 3. In the absence of SPA, heterocoagulation of SnO_2 and SiO_2 (artificial sample powders) took place at around pH 4,while such a heterocoagulation was prevented in the presence of SPA as a result of the more negative zeta potential of SnO_2. This provides a favorable condition for flotation separation of SnO_2 from a mixture with SiO_2. 4. Floatability of SnO_2 with SPA increased with decreasing solution pH. The best flotation separation of SnO_2 from an artificial mixture with SiO_2 was obtained at pH 2-4.flotationSnO_2styrene phosphonic acidzeta potentialadsorption
東北大学の論文
1987-09-30