Common problems and effective solutions in the production process of silicon-manganese alloy

Silicon manganese alloy is an alloy composed of manganese, silicon, iron and a small amount of carbon and other elements. It is a kind of iron alloy with wide use and large output. Its consumption takes the second place in ferroalloy products of electric furnace. Manganese and silicon in manganese silicon alloy have strong affinity with oxygen. When manganese silicon alloy is used in steelmaking, the melting points of deoxidized products MnSiO3 and Mn2SiO4 are 1270 ℃ and 1327 ℃ respectively, which have the advantages of low melting point, large particles, easy floating, good deoxidization effect, etc.

The research and industrialization of silicon manganese alloy production in China are relatively late, and there are still differences between China and some western developed countries in terms of production technology. Although China has achieved good practical results in the production process of silicon manganese alloy under the social market demand and the in-depth promotion of scientific and technological development, there is still a problem in the actual application and marketization process, which needs to be solved by relevant researchers.

1. Mix ratio

Silicon manganese alloy is an alloy material formed by continuous smelting operation, which involves relatively complex raw materials in its production process [2]. In the process of production, all kinds of materials should be put in reasonably according to the specified scientific proportion. Only in this way can the quality of alloy be guaranteed. However, due to the weak quality control awareness of some production personnel, there is a large subjective randomness in the proportion of production materials. When placing materials, the setting of the proportion of raw materials is not reasonable enough, which may lead to uneven quality of the alloy produced and a large amount of waste of materials. Serious, even lead to production safety problems, to a large extent, threaten the asset safety of enterprises and the life safety of production personnel.

2. Slag alkalinity

During the production of silicon manganese alloy, the basicity of slag will also affect the production of alloy. If the alkalinity of the slag is too high, the slag forming temperature will be seriously reduced, the melting speed of the furnace charge will be faster, which will cause difficulties in the reduction reaction of silicon dioxide, which will significantly reduce the silicon content of the alloy and affect the quality of the alloy. However, if the alkalinity of the slag is too low, the slag will become sticky, the slag will not be discharged smoothly, and even the slag will turn over. In this way, it will still lead to incomplete reduction of silica. Then the carbon content in the alloy is too high and the silicon content is too low, which affects the quality of the alloy.

3. Manganese recovery

In the production process of silicon manganese alloy, 70-80% of manganese will be reduced to the alloy, and only a small part will enter the slag, which will escape into the air with the elimination of furnace gas. The so-called manganese recovery is to restore more manganese to the alloy and reduce the waste of raw materials. However, due to the influence of equipment, process, operation and other aspects, some silicon manganese alloy manufacturers have obvious practical problems of low manganese recovery rate, which not only causes energy waste, but also affects the ecological environment. This is not conducive to the practical implementation of China's sustainable development strategy.