Ferrosilicon From Powdering is a common problem, first of all, we need to understand the causes of ferrosilicon from powdering in detail to find ways to prevent ferrosilicon from powdering.
The main reasons for the ferro silicon from powdering are as follows:
- Composition in ferrosilicon: improper aluminum, phosphorus and calcium content in ferrosilicon can contribute to ferrosilicon chalking. When the aluminum and phosphorus content increases to a certain value at the same time, this kind of ferrosilicon is prone to pulverization in the air with high humidity. Some information pointed out that ferrosilicon containing less than 0.04% phosphorus, aluminum content of less than 3%, is not easy to produce the phenomenon of pulverization.
- Ferrosilicon in the silicon content is low: ferrosilicon in the silicon content is low (usually scrap) is often easy to pulverize. The reason for this may be due to the silicon and iron compounds in ferrosilicon (such as FeSi, FeSi2) in the temperature reduction in the volume expansion, which leads to ferrosilicon pulverization. In addition, aluminum-containing ferrosilicon generates aluminum hydroxide and produces gas when it meets water, which is also the main cause of ferrosilicon pulverization.
- Cooling speed on ferrosilicon pulverization: ferrosilicon cooling speed is fast, the degree of segregation of silicon is small, is not easy to produce pulverization; while the cooling speed is slow, the degree of segregation of silicon is larger, it is easy to produce pulverization. Therefore, attention should be paid to controlling the cooling rate after pouring to prevent ferrosilicon pulverization.
After we understand the causes of ferrosilicon from powdering, we can prevent Ferro Silicon from powdering by paying attention to the following points:
- Control the silicon content of ferrosilicon, not too low.
- Strictly control the aluminum, phosphorus and calcium content of ferrosilicon, use better raw materials, especially avoid the use of high ash coke to reduce the aluminum and phosphorus content.
- When storing ferrosilicon, it should be strictly prevented from rain.
