Kinetics of the reaction of SiO₂ and MnO reduced by C in molten copper with carbon saturated

Abstract

In order to study the effect of matrix metal species on the kinetics of the reaction of Si02 and MnO reduced by C in molten copper with carbon saturated, the experiment, in which a preliminary slag with the composition of 38%CaO-38%SiO2-20%Al2O3-2%MnO-2%MgO that was placed in a graphite crucible and reacted with pure metallic copper at 1450°C under the atmosphere of pure CO, was carried out. The kinetics of both the reactions of Si02 and MnO in molten slag reduced by C in molten copper with carbon-saturated (2[C]sat.in Cu + (SiO2) = 2CO(g) + [Si]in Cu and [C]sat.in Cu + (MnO) = CO(g) + [Mn]in Cu) have been studied by studying the changes of the concentration of Si and Mn in molten copper with carbon-saturated, and the reaction order and reaction rate constant of the two reactions have been obtained. The results show that: (1) The reaction of SiO2 reduced by C is 0.5th order reaction while it is -0.5th order reaction for MnO; (2) The reaction rate constant of the reduction of SiO2 reduced by C in molten copper with carbon-saturated is 7.50×l0−6 mass%0.5·s−1, while that of MnO reduced by C in molten copper with carbon-saturated is 5.52x10−6 mass%1.5·s−1; (3) In this study, the reactions of SiO2 and MnO reduced by C in molten copper with carbon-saturated is a slow reaction and the time for the reaction equilibrium is more than 22 hours.