Silicothermic self-reducing MoO₃briquettes for direct alloying of Mo in molten steel

Abstract

The use of molybdenum trioxide (MoO 3 ), which is cheap and relatively abundant MoO 3 has been evaluated as a potential alternative to expensive FeMo as a steel alloying method. Pure MoO 3 volatilises very significantly above its melting point (1068 K) and results in a poor alloy yield when added to steel. The volatilisation of MoO 3 in FeSi-MoO 3 , MoO 3 -CaO and MoO 3 -MgO mixtures have been investigated by TG-DTA. Self-reducing experiments of industrial MoO 3 mixed with FeSi, CaO and CaF 2 have been performed in an electric resistance furnace. The results show that the volatilisation of industrial MoO 3 can be effectively inhibited when adding CaO and FeSi and addition of CaF 2 helps form a low melting point slag and results in good separation of metal and slag, The Mo quickly dissolves in the molten steel with 95% recovery.

Energy balance and deoxidation status of electric arc furnace tapping processes

“…21200704). Although the temperature of steel entering the LF was lower than that of the tapping steel, its physical heat was higher (as mentioned by Song et al [27]), owing to the change in steel composition. After the application of the tapping online refining process, the off-gas heat loss increased by 0.4 kwh, but the chemical energy input and the physical heat of steel entering the LF decreased by 2.1 and 2.3 kwh, respectively.…”