Generally, blast furnaces below 3, 1000 meters are used. The equipment and production process are basically the same as those of iron blast furnaces. Manganese ore Ferromanganese.During the decline of ferromanganese from the top, the high-priced manganese oxide (MnO2, Mn2O3, Mn3O4) is gradually reduced to MnO by CO as the temperature rises.But MnO only at high temperature by direct reduction of carbon into the metal, so the smelting ferromanganese need higher hearth temperature, therefore smelting ferromanganese blast furnace with high coke rate of temperature (about 1600 kg/t) and wind (above 1000 ℃).To reduce manganese loss, the slag should be kept at a higher alkalinity (CaO/SiO2 greater than 1.3).Because of the low rate is high and the indirect reduction rate, smelting ferromanganese blast furnace gas production rate and CO content is higher than that of blast furnace top temperature too high (above 350 ℃).The oxygen-enriched air blast can increase the temperature of hearth, decrease the coke ratio, increase the output, and reduce the top temperature due to the reduction of gas quantity, which can improve the smelting of ferromanganese significantly.
Oxygen blowing refining
Medium and low carbon ferromanganese can be obtained by blowing liquid carbon ferromanganese or manganese silicon alloy with pure oxygen.After many years of experimental research, this method entered industrial scale production in 1976.From "global ferro-alloy network global ferro-alloy network global ferro-alloy network".
Modern large ferromanganese reduction electric furnace capacity of 40,000 ~ 75,000 kva, generally a fixed closed.Generally speaking, the smelting power consumption of flux method is 2500~3500 kw/t, while that of non-flux method is 2000~3000 kw/t.
Manganese silicon alloy is smelted by closed or semi-closed reduction electric furnace.Generally, high silica, low phosphorus containing manganese ore or additional silica as raw materials.Low phosphorus content and high silicon dioxide content are good materials for smelting manganese-silicon alloy.The metallurgical power consumption is generally about 3500~5000 kw/t.The pretreatment of raw materials, including whole grains, preheating, prereduction and powder sintering, can significantly improve the operation of electric furnace and technical and economic indexes.