Prediction of flotation behavior of sulphide ores by oxidation index

In addition to size, density, composition and mineralogy (mineral type, texture, liberation, etc.), surface characteristics of sulphide minerals affects flotation behavior of sulphide ores considerably. The variations in surface characteristics of sulphide minerals can be related to the variations to the degree of surface oxidation which is known to influence the flotation performance. Surface oxidation affects dissolution behavior of sulphide minerals, activation/depression and adsorption of collectors, i.e. their flotation behavior. Therefore, a methodology, called “Oxidation Index” was developed to measure surface oxidation of sulphide minerals quantitatively and predict flotation behavior of different ore types. The methodology is based on derivation of an ore specific calibration curve and prediction of flotation performance of different ore types from the same deposit by using the calibration curve. The results of the test works performed using a complex Cu–Zn sulphide ore from Çayeli Bakır İşletmeleri A.Ş., Turkey are discussed in this paper.

Compatibility of the calibration curve with the results of the EDTA tests conducted in the plant by Çayeli staff..Figure optionsDownload as PowerPoint slideHighlights
► Degree of surface oxidation affects proportionally flotation performance of sulphide minerals.
► “Oxidation Index” methodology was developed to express degree of oxidation quantitatively.
► It is possible to predict flotation performance of different ore types with oxidation index methodology.
► This methodology can help the plant metallurgist to plan the blending strategy.