Pulp Potential Control in Flotation: The Effect of Hydrogen Peroxide Addition on the Extent of Xanthate Oxidation

Author： Nava-Alonso F. Pecina-Treviño T. Pérez-Garibay R. Uribe-Salas A.

ISSN： 0008-4433

Source： Canadian Metallurgical Quarterly, Vol.41, Iss.4, 2002-12, pp. : 391-397

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Abstract

The effect of increasing the redox potential by means of hydrogen peroxide additions upon the extent of oxidation of potassium ethyl xanthate (KEX: C₂H₅OCS₂K) was investigated. The study was carried out at pH 7 in solutions of constant ionic strength (0.01 M NaNO₃) using an initial surfactant concentration of 100 mg/L (6.176 × 10⁻⁴ M KEX). The Eh was varied in the range of 260 to 450 mV (vs SHE). The concentration of surfactant was determined by means of UV spectrometry at a wavelength of 280 nm. At shorter wavelengths it was observed that the absorbances of NaNO₃ and H₂O₂ interfere with the measurement. It was determined that the main product of the oxidation of xanthate was perxanthate; no dixanthogen was detected regardless of the Eh of the solution.