Tianjin Global Alloy Material Co., Ltd.

Silico Manganese:

Silico Manganese Blast Furnace Smelting:

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

During the process of descending from the furnace top, the 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). 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 blasts 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.