Ferromanganese Alloy Reasonable smelting cycle
Energy Saving Measures for Ferromanganese Alloy Production
With the world's energy consumption concerns, energy saving has become an important part of the ferromanganese industry, but also the key to business survival.
Ferromanganese alloy production of electric furnace and blast furnace method two, China's main use of electric furnace production, reduce power consumption can start from the following aspects.
1, reduce slag ratio
Reduce the slag ratio can reduce heat loss, improve the recovery of manganese, effectively reduce power consumption. The main measures include increasing the reduction rate of Mn and Si and increasing the furnace temperature.
2, reasonable slag type
Slag composition determines the appropriate smelting temperature, alkalinity, viscosity, electrical and other factors, and affect the elements in the alloy and the distribution of slag. The ideal slag composition of ferromanganese alloy is MnO8% ~ 10%, CaO12% ~ 15%, MgO4% ~ 5%, SiO2 32% ~ 36%, Al2O334 ~ 43%.
3, to improve the grade of manganese material into the furnace
For manganese ferroalloy smelting, improve the manganese grade into the furnace, can improve the recovery rate of manganese, reduce power consumption. Manganese ore grade is low, the amount of slag, reducing agent, flux consumption increased, resulting in increased power. Experiments show that the ore grade is reduced by 1 per kilometer
%, Will consume 64kWh / t of electricity.
4, select a reasonable smelting cycle
The period of the smelting of ferromanganese alloy by the submerged arc furnace is determined by the volume of the reaction zone in the furnace and the reduction degree of the elements Mn and Si in the slag. The actual production is often based on the phenomenon of "slagging" in the furnace. Appropriate to extend the smelting time, so as to achieve the ferro-manganese alloy slag furnace implementation of low slag than smelting operation. As a result of the furnace to improve the power to ensure that the furnace coke reaction area of the high temperature conditions, so that the reduction rate of Mn, Si greatly improved, saving energy. But the smelting time can not be too long, otherwise the iron temperature is too high will cause the alloy of manganese volatilization loss, reduce the recovery of Mn. In addition, the MnO content is close to the reduction of the balance of "slag", stay in the furnace, will increase the smelting power consumption. Thus, according to the specific operating conditions, through practice to determine a reasonable smelting time.
5, slag operation
It is Japan's first proposed new ferroalloy technology, which is characterized by the use of slag resistance heat instead of conventional arc heat, to promote the furnace reaction area to expand, to reduce power consumption, improve the recovery of silicon and manganese and Production and reduce power consumption purposes.