Oxidation of marmatite

As a continuation of our long-term investigation of the thermodynamics, kin etics and mechanism of metal sulphide oxidation the present paper present r esults on the Marmatite oxidation, using DTA, TGA, X-ray diffraction analys is, optical and scanning electron microscopy (SEM). The paper presents three-dimensional diagrams of partial pressures of SO2 a nd O-2 against T for the Zn-Fe-S-O system. A multi-layer oxide product of high porosity (over 30%) was obtained as sho wn by scanning electron microscopy. On the basis of kinetic studies and ele ctron microscopy, it was found that under the conditions of zinc concentrat es fluid bed roasting, the oxidation of marmatite takes place in a kinetica lly controlled regime. (C) 2000 Elsevier Science B.V. All rights reserved.