calcium silicon alloy

When smelting silicon-calcium alloy, the temperature of the melting zone is required to be high, and the power density in the furnace is more concentrated. Therefore, the diameter of the pole core of the silicon-calcium alloy electric furnace is correspondingly smaller than that of the ferrosilicon electric furnace of the same capacity, and the depth of the furnace is correspondingly deeper, which is roughly the diameter of the electrode. 2.7-3 times. The electrode current density is 6-7.5A/cm2, and the working voltage is slightly lower than that of the ferrosilicon furnace. At present, in the production process of large-scale silicon-calcium alloy electric furnaces using the mixed feeding method, the tap hole is seriously eroded, resulting in running iron, and the tap hole cannot be opened. The main reasons for the damage to the tap hole are the flushing and erosion of high-temperature slag and iron, and the blowing of the furnace eye with a large amount of oxygen. Some enterprises use refractory materials made of silicon carbide and nitridize the tapholes, but the problem has not been completely solved. For this reason, the corresponding refractory materials should be selected according to the temperature of the slag and iron of silicon calcium, and the chemical composition of the slag, and the corresponding plugging materials should be prepared to solve the problem gradually. Blow eye.


Since the specific gravity of the silicon-calcium alloy is slightly lighter than that of the slag, the alloy floats on the upper part of the ladle after tapping. When pouring, the alloy is poured out of the ingot mold first, and then the slag sinking in the lower part of the ladle is poured into the slag tank. Due to the high temperature, the molten iron For the hot cleaning of the ladle, it is necessary to use a suitable cleaning machine and continuously improve the ladle material to increase the service life of the molten iron ladle and solve the problem of difficult turnover of the molten iron ladle in production.