| A study has been made to investigate the roasting mechanism of synthetic chalcopyrite, with varing the temperature, the reaction atmosphere(partial pressures of O₂ and SO₂), and the size of particles. The composition of the chalcopyrite prepared at our laboratory was confirmed to be CuFeS_(1.8) by means of X-Ray diffraction technique. Under the condition of the flow rate of air, 150cc/min and the rate of temperature increment 3 cc/min the following is postulated as possible successive decomposition steps commensurate with the observed D. T. A peaks and the X-Ray Analysis of end products. Effects of the flow rate of air and the partial pressure of oxygen upon D. T. A. peak were not significant, while results were also indicated that in the presence of small amount of SO₂ a new phase Fe₂(SO₄)₃ was formed, which signified by a unique D. T. A. peak(about 500℃). |
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