72% ferrosilicon 75% Ferrosilicon

Detailed Explanation of the Physical and Chemical Properties of ferrosilicon: Ferrosilicon, as a typical iron alloy, appears in the form of silver-gray or dark gray blocks, granules or powder (requiring special treatment), has a metallic luster, and is hard and brittle in texture. Its physical properties are significantly influenced by the silicon content: the higher the silicon content, the lower the density (typically within the range of 3.5-5.15g /cm³), and the melting point also decreases accordingly (the melting point of FeSi75 is approximately 1300-1350°C, lower than that of pure iron at 1538°C). Ferrosilicon has good electrical conductivity, but its thermal conductivity is not as good as that of pure iron. In terms of chemical properties, the most prominent feature of ferrosilicon is its strong reducing property. Silicon has a very high chemical reactivity. Especially in a high-temperature molten state, it can react vigorously with non-metallic elements such as oxygen and sulfur. Ferrosilicon is relatively stable in normal temperature air. However, varieties with high silicon content (such as FeSi75) tend to oxidize slowly in humid air and may release a small amount of hydrogen gas, posing a risk of spontaneous combustion. Therefore, special attention should be paid to moisture-proofing and powdering prevention during storage and transportation. Ferrosilicon is insoluble in water but soluble in strong acids (such as hydrofluoric acid and aqua regia), generating the corresponding silicates and hydrogen gas. Its high silicon content also enables it to be used as a reducing agent in the metal thermal reduction method to produce other metals (such as magnesium) under specific conditions. Understanding these basic physical and chemical properties is a prerequisite for the safe use and full play of the performance of ferrosilicon.