Phase composition, structure and catalytic activity in oxidation reactions of fayalite waste from the flotation of copper slag
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2017-01-01
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Abstract
The study examines the phase composition and structure of fayalite waste (FW), as well as the changes that occur during heat treatment applied in the temperature range of 500 - 1000 °C. Differential thermal analysis, X-Ray diffraction analysis, Fourier transform infrared spectroscopy, Optical microscopy, Scanning electron microscopy and Energy dispersive spectroscopy have been used. The main crystalline phase in waste was fayalite, accompanied by magnetite, amorphous silicate phase and a small amount of copper-iron sulfides. Phase-structural changes were found in all heat treated samples. Their extent was temperature dependent. Fayalite transformed to hematite, magnetite and silica. Magnetite transformed to hematite through oxidation. Glass phase underwent oxidation too. In oxidation at 1000°C FW baseline phases were fully replaced by hematite, magnetite, cristobalite and amorphous silicate phase. At this heat treatment temperature the sample exhibited the highest catalytic activity towards the oxidation of CO.