If you work in steelmaking, you'll know that ferromolybdenum is used as an alloy additive. This can improve how easily steel can be hardened and help stop it going brittle when it's cooled.Molybdenum is a key raw material in steelmaking. It's added to cast iron to make it stronger and more resistant to wear and tear. It's got so many functions, so let's take a look at how it's smelted for your reference.The raw material for smelting ferromolybdenum is mainly molybdenite (MoS2). Before smelting, the molybdenum concentrate is usually oxidised and roasted in a multi-hearth furnace to obtain roasted molybdenum ore with a sulfur content of less than 0.07%.Ferromolybdenum smelting generally adopts the outside-furnace method.
The furnace is basically a cylinder on a sand base, lined with clay bricks, and uses ferrosilicon (75% silicon and a bit of aluminium particles) as the reducing agent.Once the charge has been added to the furnace barrel, it's smelted using the upper ignition method, with an initiator (saltpeter, aluminium chips or magnesium chips) on the material surface. When it's ignited, it reacts in a violent way, then calms down, releases slag and removes the furnace barrel.The ferromolybdenum ingots are first cooled in the sand nest, then sent to the cooling room to be flushed with water for cooling, crushing and finishing.
