Determination of Activity/Selectivity Ratio in Physical and Chemical Adsorption of a Reagent
S. A. KONDRAT’EV1, N. P. MOSHKIN2, E. A. BURDAKOVA1
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Lavrentiev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrentieva 15, Novosibirsk, 630090 Russia
Keywords: флотация, гидрофобность, минеральные частицы, физическая и химическая формы сорбции, расклинивающее давление, селективность, прослойка жидкости, flotation, hydrophobicity, mineral particles, physical and chemical adsorption, wedging pressure, selectivity, liquid interlayer
Abstract
Under discussion is the particle and bubble interaction in froth flotation. Water flow from an interlayer between the particle and the bubble under effect of hydrophobic component of wedging pressure is studied. It is assumed that for a mineral to be extracted, electrostatic interaction slightly influences the particle and bubble contingence and the liquid interlayer thinning. For this reason, particular attention is given to the effect exerted by mineral particle surface hydrophobicity on water flow rate from the interlayer. It is found that water flow rate under influence of hydrophobic component of wedging pressure is less than water flow rate under physical adsorption of a reagent. The authors hypothesize that hydrophobization creates areas on the mineral particle surface, where the reagent species active relative to gas-water interface attach in accordance with the polarity equalizing rule. Physically adsorbed reagent species pull out water from the interlayer after the interlayer rupture and, thus, remove the kinetic constraint of the particle-bubble attachment.
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