Ferro Manganese 10-50mm

Ferromanganese: An iron alloy composed of manganese and iron. Main categories: high carbon ferromanganese (containing 7% carbon), medium carbon ferromanganese (containing 1.0~1.5% carbon), low carbon ferromanganese (containing 0.5% carbon), metallic manganese, mirror iron, silicon-manganese alloy.

Packaging: Customized according to customer requirements.

Generally, blast furnaces with a height of less than 1,000m3 are used, and the equipment and production processes are roughly the same as those of iron-making blast furnaces.

During the process of manganese ore falling from the furnace top, high-priced manganese oxides (MnO2, Mn2O3, Mn3O4) are gradually reduced to MnO by CO as the temperature increases. However, MnO can only be directly reduced to metal through carbon at high temperatures, so smelting ferromanganese requires a higher furnace temperature. For this reason, the blast furnace for smelting ferromanganese uses a higher coke ratio (about 1600 kg/ton) and air temperature (1000 ℃ or above). In order to reduce manganese loss, the slag should maintain a high alkalinity (CaO/SiO2 greater than 1.3). Due to the high coke ratio and low indirect reduction rate, the gas yield and CO content of the ferromanganese-making blast furnace are higher than those of the iron-making blast furnace, and the furnace top temperature is also higher (above 350°C). Oxygen-enriched blast can increase the hearth temperature, reduce the coke ratio, increase output, and reduce the furnace top temperature due to the reduced gas volume, which has a significant improvement effect on the smelting of ferromanganese.

There are two types of reduction smelting of ferromanganese: flux method (also known as low manganese slag method) and flux-free method (high manganese slag method). The principle of the flux method is the same as that of blast furnace smelting, except that electric energy is used instead of coke for heating. By adding lime, a high alkalinity slag (CaO/SiO2 is 1.3~1.6) is formed to reduce the loss of manganese. Flux-free smelting without adding lime results in a low-iron, low-phosphorus and manganese-rich slag with low alkalinity (CaO/SiO2 less than 1.0) and high manganese content. This method has less slag, which can reduce power consumption, and the lower slag temperature can reduce the evaporation loss of manganese. At the same time, the by-product manganese-rich slag (containing 25~40% manganese) can be used as a raw material for smelting manganese-silicon alloys, achieving higher results. Comprehensive recovery rate of manganese (more than 90%). Most modern industrial production uses a flux-free method to smelt carbon ferromanganese, and the joint production process with the smelting of manganese-silicon alloy and medium and low carbon ferromanganese is shown in the figure.

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