high-purity ferro silicon

The new process of high-purity ferro silicon overcomes the shortcomings of traditional methods, selects appropriate raw materials and process conditions, and produces high-purity ferro silicon for smelting high-grade silicon steel. The production of high-purity ferro silicon adopts selected quartz stone, petroleum coke (or petroleum coke plus a small amount of other carbon) and silicon steel shavings, which are reduced in a submerged arc furnace. The particle size of petroleum coke is 0-10mm, and the optimal particle size is 0-5mm. The ratio of furnace charge is quartz stone:petroleum coke:silicon steel shavings is 100:40-55:5-55, and the ratio is based on the fixed carbon content. The chemical composition (weight) of quartz stone is required to be SiO2>98.0%, Al2O3<0.03%, CaO<0.01%, and the sum of other impurities except iron oxide is less than 0.02%. The impurity content of the obtained high-purity ferro silicon product can be controlled within the following range; Si and Fe are two effective elements, and the ratio is adjusted according to the application requirements. If necessary, according to the change of the required amount of individual elements, chlorine gas can be introduced into the liquid product out of the furnace for 20-40 minutes, 20 kg, or oxygen for 30-40 minutes, 5 kg, or water gas (H2+H2O) for 20-40 minutes , 5 kg. The smelting operation of high-purity ferro silicon is the same as that of ordinary submerged arc furnace method to produce ferro silicon alloy. That is to say, the submerged arc furnace is energized and the temperature is raised to above 1000°C, and the mixed materials are gradually added to the furnace until the furnace is filled, and then the material level is maintained, and the furnace is pounded and eye-catching as needed. Continuous reduction smelting, intermittent furnace, the first discharge time is longer, and then the regular discharge time varies with the size of the capacity. Normally, there is no need for out-of-furnace refining. If the impurity of the ore is slightly higher and the impurities in the product exceed the standard, a small amount of chlorine gas, or oxygen, or a combination of chlorine and oxygen can be used according to the impurity composition of high-purity ferro silicon to carry out out-of-furnace liquid refining. Sampling analysis, ingot casting, broken packaging. High-purity ferro silicon is an advanced form of ordinary ferro silicon, which requires higher smelting technology, but it has an industrial added value of 10,000 yuan per unit product than ordinary ferro silicon, and has the characteristics of low energy consumption and high product quality. High-purity ferro silicon can be used as deoxidizer and alloy additive, mainly used in the production of steel cord, clean steel, non-oriented silicon steel, oriented silicon steel, high-density plate, alloy steel and other high-end steel products. Its deep-processing materials are widely used in many fields such as electrical engineering and automobile manufacturing.