At present, there are five main methods for producing high-quality ferrosilicon in China. One is to produce high-purity ferrosilicon using selected furnace materials, the other is to produce high-purity and low-carbon ferrosilicon by means of chlorine refining outside the furnace, and the third is to use furnace. The method of producing oxygen and high-alumina ferrosilicon by externally blowing oxygen, the high-purity and low-carbon ferrosilicon by the method of hot-washing slag washing, and the production of low-aluminum and low-carbon ferrosilicon by using the method of selecting the charge. The production of high-purity ferrosilicon by using the method of selecting the charge is mainly through the selection of quartz stone and petroleum coke, wood block, charcoal and silicon steel sheet raw materials for smelting production, so as to reduce the content of impurity elements in the product. Due to the large fluctuation of raw material quality, some impurities are inevitably brought into the smelting production process, so the reduction rate of impurities in the product is limited, the product quality is not high, the yield is low, and the production condition is difficult to maintain. The operation of the furnace mouth is difficult, the production cost and energy consumption of the product are large, and the economic indicators are poor. The furnace method has better effect of removing calcium and aluminum, but there are many exhaust gases, and the production often causes leakage and the blown chlorine graphite tube is broken and the refining is suspended, thereby seriously polluting the environment, endangering the health of workers, and producing Equipment is highly corrosive. The method of blowing oxygen outside the furnace is carried out for refining outside the furnace, and the removal of impurities such as calcium, aluminum and carbon in the product is also good. However, in the course of use, due to the violent tumbling of molten iron and the large loss of splashing, the temperature of molten iron drops rapidly, resulting in a large loss of sticking and iron, and the statistical loss of data is between 12% and 20%. The graphite tube for oxygen blowing is often broken and the refining is stopped, the yield is low, and the economy is also uneconomical. The method of selecting the charge material to produce low-alumina and low-carbon ferrosilicon is mainly through the selection of reducing agents, such as blue carbon, gas coal coke and other raw materials for smelting production, in order to reduce the impurity elements in the product, mainly the aluminum content. Due to the fluctuation of the raw material composition, some impurities are inevitably brought into the smelting process, so that the content of impurities in the product is limited, and the aluminum content can generally be reduced to 1.6%, and can only be reduced to 1.2% at most. 0.2%, can only produce some brands of products.
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Label: high quality ferrosilicon
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