75# ferrosilicon is a traditional raw material for steelmaking, and its market price changes frequently. Therefore, how to identify the quality of 75# ferrosilicon and buy it from the manufacturer at a relatively reasonable price becomes a thorny issue for steel mills or traders. Well, let’s see below.
1. Distinguish the quality of ferrosilicon from silica
Silica is the most basic raw material for producing ferrosilicon 75, so the quality of silica also determines the quality of ferrosilicon 75, so how to judge the quality of silica? The requirement is that the silicon content in silica should be greater than 97%. When silica is smelted, an element of aluminum oxide is often formed. This element will not only affect the slag discharge problem during steelmaking, but also increase the aluminum element in ferrosilicon, greatly affecting the quality of ferrosilicon.
2. The content of calcium oxide and magnesium oxide elements affect the quality of ferrosilicon 75
Usually, the content of calcium oxide and magnesium oxide in ferrosilicon should be less than 1%. If it exceeds this range, the amount of smelting slag will be increased when steelmaking is used, and the corrosion of the tap hole will greatly affect the quality of ferrosilicon 75.
3. The particle size of silica is also a factor affecting the quality of ferrosilicon 75
The particle size of silica is also a factor affecting the quality of ferrosilicon 75. If the particle size of silica is too large, the reaction speed will slow down during smelting, and if it is too small, there will be more powder and the air permeability of the surface of ferrosilicon 75 will be affected. How much particle size is suitable? Here it is required that the particle size of the silica used for the production of ferrosilicon 75 should be 60-120 mm, and the particle size greater than 80 mm should be greater than 50%. Accounted for 50%.