For the cobalt-bearing copper oxide concentrate from Congo,experiment of coke reduction smelting with fayalite slag was conducted.The effects of CaO-to-SiO2 mass ratio,FeO-to-SiO2 mass ratio and coke rate on the reduction rates of copper and cobalt were investigated.The reduction sequence and conditions of copper,cobalt,iron and silicon oxides were analyzed by thermodynamics.The reduction process of copper,cobalt and iron oxides was quantitatively analyzed by means of metal oxide reduction thermodynamics and coke gasification kinetics.The results show that the reduction of copper,cobalt and iron in the copper oxide concentrate can be divided into the competitive fast reduction period in the early stage and the slow reduction period of copper and cobalt in the later stage.The reduced metal iron in the slow reduction period will undergo reoxidation.The large amount of competitive iron reduction in the early stage and its reoxidation in the later stage will reduce the reduction rate of copper,cobalt and iron and the effective utilization rate of coke.The formation mechanism of ferroalloy layer on the surface of crude copper is revealed.
copper oxide concentratecoppercobaltreduction of FeOthermodynamics modelfayalite
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