Ferro-molybdenum is an alloy composed of molybdenum and iron, generally containing 50% to 60% molybdenum, commonly used as an additive in steelmaking, which in turn can make the fine grain organisation of the steel more uniform, and improve the hardenability of the steel, which is conducive to the elimination of temper brittleness. So, what is the principle of molybdenum iron smelting?
The silicon and aluminium thermal reduction method of smelting ferromolybdenum production is a traditional molybdenum ferroalloy smelting technology, belonging to a kind of furnace method (generally used to produce alloys with high melting point, difficult to reduce, and very low carbon content or pure metal). The raw material used for smelting is molybdenum oxide, the reducing agent is ferrosilicon and aluminium powder, the heating agent is saltpeter, the slag regulator is calcium oxide, and the ferroalloy grade regulator is steel chips and iron scales.
In the reaction of molybdenum oxide reduction with silicon, the negative value of free energy change is very high and the reaction proceeds very strongly. The reaction of reducing molybdenum oxide with aluminium has an even higher negative value of free energy and is almost explosive. In ferromolybdenum smelting, the most important side reaction is the reduction of iron oxides. There are three possible forms of iron oxides in the charge involved in the reaction, namely Fe2O3, Fe3O4, and FeO.
When smelting ferromolybdenum, the speed of the autothermal reaction is very rapid, and the temperature of the furnace drops very quickly as soon as the reaction is over. In order to maintain the fluidity of the material in the furnace and ensure the full separation of ferromolybdenum from the slag, it seems necessary to try to reduce the melting point and viscosity of the slag.
Reaction, silicon is oxidised into silicon dioxide, it and molybdenum baking sand in the silicon dioxide with the formation of the viscosity of the acidic silica slag; and the reaction generated by ferrous oxide, alumina and other alkaline slag can play a role in neutralising and diluting the role of silica slag; but it's not enough, the furnace material is usually also added to the fluorite, lime, limestone, which can be played to dilute the slag and reduce the melting point of the slag role. However, it should be noted that the additives can reduce the melting point of the slag and viscosity, but they are melted must consume a lot of heat. Therefore, how much additives to the right amount, to avoid excessive heat loss.
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