The production of ferromolybdenum typically involves the following steps:
The initial stage of the process is the preparation of raw materials.
Molybdenite concentrate: The process begins by obtaining molybdenite ore (MoS₂), which is concentrated to produce a purer form of molybdenum.
The next step is roasting. The concentrate is then roasted in air at high temperatures (about 600-700°C) to convert molybdenite to molybdenum trioxide (MoO₃). It should be noted that sulphur dioxide (SO₂) is released during this step.
The next step is reduction.
The production of ferromolybdenum occurs as follows: The resulting molybdenum trioxide is then reduced to ferromolybdenum using a reducing agent, such as ferrosilicon (Fe-Si) or aluminium, in an electric arc furnace or similar equipment. The reduction process typically requires temperatures between 1200 and 1600 degrees Celsius.
The next step is cooling and purification.
Once the reduction process is complete, the resulting ferromolybdenum is cooled and removed from the furnace.
Subsequent processing may include grinding, milling and refining to achieve the desired chemical composition and shape.
Alloying:
Ferromolybdenum is often combined with steel in various proportions to increase the hardness, strength and high-temperature stability of the final metal product, especially in the production of steel and superalloys.
Quality Control:
The final products are usually analysed for molybdenum and impurities to ensure that they meet the required specifications for the intended application.
This process allows manufacturers to produce ferromolybdenum, which is a vital ingredient for various types of steel and metallurgy.
