Adsorption kinetics and thermodynamics of sodium butyl xanthate onto bornite in flotation

Abstract

In this paper, the effect of sodium butyl xanthate (NaBX) adsorption on the surface of bornite at different pH on flotation was studied by adsorption kinetic and thermodynamic. The flotation results demonstrated that the recovery was the highest when pH was 9 in NaBX solution (4×10⁻⁵ mol/L). The adsorption kinetics showed the reaction of NaBX on the bornite conformed to the second order kinetic equation; it belonged to the multimolecular layer adsorption of Freundlich model; the maximum adsorption rate constant was 0.30 g/(10⁻⁶ mol·min), and the equilibrium adsorption capacity was 2.70×10⁻⁶ mol/g. Thermodynamic calculation results indicated that the adsorption process was spontaneous chemisorption, and the adsorption products of NaBX on bornite surface were cupric butyl xanthate, ferric butyl xanthate and dixanthogen, which were confirmed by infrared spectrum measurements.

Keywords

bornite / sodium butyl xanthate / adsorption / kinetics and thermodynamics / infrared spectrum

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