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Properties and Applications of Molybdenum
Published in C. K. Gupta, Extractive Metallurgy of Molybdenum, 2017
Ferromolybdenum is a traditionally used form of molybdenum as a steel additive. It accounts for quite a major share of consumption of molybdenum by the industry. Production of ferromolybdenum is accomplished by thermit or electric furnace processes. The molybdenum content of the product is generally between 55 and 75%. A thermetically reduced product has quite a low carbon content (0.10% max).
Thermodynamic model of metallothermic smelting of ferromolybdenum
Published in Mineral Processing and Extractive Metallurgy, 2019
Ferromolybdenum is an important commodity used in the production of many alloy steels. It is made by the silicoaluminothermic batch reduction of technical molybdenum oxide at very high temperatures. In this work, a computational thermodynamics model using HSC Chemistry for Windows 7.1 software was created and its input parameters discussed and justified. The model predicted satisfactorily the composition of both the ferromolybdenum and waste slag from a typical charge mixture. It was found that the silicon content of the ferromolybdenum produced was not very sensitive to either the assumed smelting temperature or the activity coefficient of silicon in the alloy. Losses of molybdenum to the slag as dissolved oxides occurred as both MoO2 and MoO3, but the total molybdenum losses of dissolved oxides were predicted to be much lower than the published molybdenum contents of industrial slags. This suggests that molybdenum losses to slag in practice are almost entirely due to the inclusion of unsettled ferromolybdenum droplets. Losses of molybdenum by oxide volatilisation were also predicted to be trivial under equilibrium conditions, and it was suggested that the observed losses may be a result of the heating of as-yet unreacted charge mix.