新しい浮選理論

抄録

The role of the interfacial electrical condition on the adsorption of collectors on mineral surfacesis discussed with particular reference to the flotation of oxidized iron ores.From eledroklnetic measurements made on iron oxides, silica, etc., H⁺and OH^-are identified to act as potential-determining ions, thus controlling the electrical properties on these oxides. Adsorption of collectors then depends strongly on the pH of the solution; anionic collectors are adsorbed on positively charged surfaces and cationic collectors on negatively charged surfaces, which in turn defines the effective flotation range with respective collectors for a given oxide. Selectivity of flotation separation is thus demonstrated with an artificial mixture of quartz and goethite to be in good agreement with the basic floatabilities of the respective minerals. Detrimental effects of slimes in the iron ore flotation, both reagent consumption due to largespecific surface and slime coating, can also be interpreted by the interfacial electrical condition of the minerals comprising the iron ore slimes.