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Ferromanganese AI simulator
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Ferromanganese
Ferromanganese is an alloy of iron and manganese, with other elements such as silicon, carbon, sulfur, nitrogen and phosphorus. The primary use of ferromanganese is as a type of processed manganese source to add to different types of steel, such as stainless steel. Global production of low-carbon ferromanganese (i.e. alloys with less than 2% carbon content) reached 1.5 megatons in 2010.
The properties of ferromanganese vary considerably with the precise type and composition of the alloy. The melting point is generally between 1,200 °C (2,190 °F) and 1,300 °C (2,370 °F). The density of the alloy depend slightly on the types of impurities present, but is generally around 7.3 g/cm3 (0.26 lb/cu in).
Sources of manganese ore generally also contain iron oxides. As manganese has a more negative free energy of oxidation than iron, i.e. is chemically harder to reduce, during the reduction of manganese ore, iron is also reduced and mixed with the manganese in the melt. This is unlike other oxides such as SiO2, Al2O3 and CaO, which are more stable as oxides than manganese.
Reduction is achieved using a submerged arc furnance. There are two main industrial procedures to perform the reduction, the discard slag method (or flux method) and the duplex method (or fluxless method). Despite the name, the differences in the method are not in the addition of flux, but rather in the number of stages required. In the flux method, basic fluxes such as CaO are added in order to electrolytically reduce the manganese ore:
![{\displaystyle {2\,\mathrm {MnO} {}+{}\mathrm {C} {}\mathrel {\longrightarrow } {}2\,\mathrm {Mn} {}+{}\mathrm {CO} {\vphantom {A}}_{\smash[{t}]{2}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/956d42d42f4fb0ea467edcae7d8992aca2b3c049)
The remaining slag after the reduction process has approximately 15-20% manganese content, which is usually discarded.
In the fluxless method, carbon reduction is also used in the first stage, but the fluxes added do not necessarily increase the activity of the manganese. As a result, the remaining slag has a concentration of 30% to 50% of the manganese. This is then reprocessed with quartzite to make silicomanganese alloys. The resultant discarded slag has a manganese content of less than 5%, increasing the yield. As a result, this method is used more often in industry.
In both methods, due to the addition of carbon as an reducing agent, the alloy produced is referred to as high-carbon ferromanganese (HCFM), with a carbon content of up to 6%.
Ferromanganese
Ferromanganese is an alloy of iron and manganese, with other elements such as silicon, carbon, sulfur, nitrogen and phosphorus. The primary use of ferromanganese is as a type of processed manganese source to add to different types of steel, such as stainless steel. Global production of low-carbon ferromanganese (i.e. alloys with less than 2% carbon content) reached 1.5 megatons in 2010.
The properties of ferromanganese vary considerably with the precise type and composition of the alloy. The melting point is generally between 1,200 °C (2,190 °F) and 1,300 °C (2,370 °F). The density of the alloy depend slightly on the types of impurities present, but is generally around 7.3 g/cm3 (0.26 lb/cu in).
Sources of manganese ore generally also contain iron oxides. As manganese has a more negative free energy of oxidation than iron, i.e. is chemically harder to reduce, during the reduction of manganese ore, iron is also reduced and mixed with the manganese in the melt. This is unlike other oxides such as SiO2, Al2O3 and CaO, which are more stable as oxides than manganese.
Reduction is achieved using a submerged arc furnance. There are two main industrial procedures to perform the reduction, the discard slag method (or flux method) and the duplex method (or fluxless method). Despite the name, the differences in the method are not in the addition of flux, but rather in the number of stages required. In the flux method, basic fluxes such as CaO are added in order to electrolytically reduce the manganese ore:
The remaining slag after the reduction process has approximately 15-20% manganese content, which is usually discarded.
In the fluxless method, carbon reduction is also used in the first stage, but the fluxes added do not necessarily increase the activity of the manganese. As a result, the remaining slag has a concentration of 30% to 50% of the manganese. This is then reprocessed with quartzite to make silicomanganese alloys. The resultant discarded slag has a manganese content of less than 5%, increasing the yield. As a result, this method is used more often in industry.
In both methods, due to the addition of carbon as an reducing agent, the alloy produced is referred to as high-carbon ferromanganese (HCFM), with a carbon content of up to 6%.
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