Ferro silicon manufacturing technique

Ferrosilicon manufacturing technique
Ferrosilicon is an important ferroalloy with the characteristics of high silicon and low iron. It is widely used in steel smelting, cast iron production, electronics industry and other fields. The production process of ferrosilicon will be introduced below.
The production process of ferrosilicon mainly includes three links: ore dressing, smelting and casting.

1.The first is ore dressing. The raw materials for ferrosilicon production are mainly quartz sand and iron ore. Quartz sand and iron ore with higher silicon content and lower impurity content are selected for crushing, grinding and ore classification to ensure the quality of raw materials.

2.The next is smelting. Smelting is the core link of ferrosilicon production. First, the selected quartz sand and iron ore are mixed in a certain proportion and reduced under high temperature. Usually, electric furnaces or blast furnaces are used for in-furnace reactions. In the electric furnace, the mixture is heated to a high temperature by electric energy heating and adding a reducing agent, so that the iron oxide in the iron ore is reduced to ferrous oxide, and then reacts with the silicon dioxide in the quartz sand to form ferrosilicon alloy. In the furnace, there are also a series of physical and chemical reactions, such as carbon oxidation reaction, reduction reaction, melting reaction, etc. By controlling the temperature, redox conditions and additives, ferrosilicon alloys of different specifications and compositions can be obtained.

3.The last step is casting. The ferrosilicon alloy after smelting needs to be cast and formed, and the common method is casting. The molten ferrosilicon alloy is poured into the mold and cooled to obtain ferrosilicon castings. During the casting process, it is necessary to pay attention to controlling the solidification process of the casting to avoid defects such as pores and inclusions. At the same time, subsequent treatments such as surface cleaning and trimming are also required according to requirements.

In short, the production process of ferrosilicon mainly includes three links: ore dressing, smelting and casting.

By selecting suitable raw materials, controlling reaction conditions and casting processes, ferrosilicon alloy products with stable quality can be obtained.