Removal of Silicon Impurity from Molten Brass Using an Innovative ZnO-containing Slag

摘要

The elimination kinetics of silicon impurity from molten brass by a novel ZnO-Na2O-B2O3-Na2CO3 slag has been studied. The influence of temperature, initial concentrations of Si in molten brass, and initial concentrations of SiO2 in liquid slag on the kinetics of the reaction was investigated. Experimental results showed that the reaction rate increases with increasing temperature and with decreasing initial concentration of silicon in the metal and silicon dioxide in the slag phase. Based on a kinetic analysis, it was concluded that the reaction is predominantly controlled by mass transfer in the slag phase. The activation energy was estimated to be approximately 197 kJ mol?1.