Silicothermic self-reducing MoO 3 briquettes for direct alloying of Mo in molten steel

Abstract

The use of molybdenum trioxide (MoO₃), which is cheap and relatively abundant MoO₃ has been evaluated as a potential alternative to expensive FeMo as a steel alloying method. Pure MoO₃ volatilises very significantly above its melting point (1068 K) and results in a poor alloy yield when added to steel. The volatilisation of MoO₃ in FeSi–MoO₃, MoO₃–CaO and MoO₃–MgO mixtures have been investigated by TG-DTA. Self-reducing experiments of industrial MoO₃ mixed with FeSi, CaO and CaF₂ have been performed in an electric resistance furnace. The results show that the volatilisation of industrial MoO₃ can be effectively inhibited when adding CaO and FeSi and addition of CaF₂ 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.

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