Some Characteristic Features of Desiliconisation of Hot Metal by Soda-ash

Abstract

Desiliconisation of high silicon hot metal was carried out by injecting soda-ash at 1250°C in an induction furnace. The DSi reaction was found to depend on amount and temperature of the hot metal. But it was found to be independent on modes of additions, type of refractory materials and additives used. On the basis of experimental results and discussion it has been concluded that the DSi reaction did not proceed alone according to the proposed reaction: Na₂CO₃+Si=Na₂O+SiO₂+C The silicon was removed from hot metal both by above equation and by vapourisation of silicon by vapourisation induced process.