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A carbon brick for blast furnace and its preparation method and process
Keywords: anti-corrosion carbon bricks
Release time:
2023-03-06 17:14
Source:
network
The present invention belongs to the field of carbon brick technology. Specifically, it relates to a carbon brick for blast furnaces and a preparation method thereof.
Background technology:
Blast furnace is the main equipment in the steel and metallurgical industry that uses the iron ore coke reduction method to produce molten iron. With the modernization and large-scale development of blast furnaces and the implementation of strengthened smelting technology, extending the lifespan of blast furnaces has become the main way for steel enterprises to reduce consumption and increase efficiency. The main areas that determine the lifespan of the blast furnace are the bottom and hearth areas, especially the abnormal erosion areas below the iron mouth and iron mouth. Carbon refractories are widely used as furnace lining materials because of their good thermal conductivity, high thermal shock stability, low coefficient of thermal expansion and poor affinity with iron. The working environment of furnace lining materials is harsh, and there are many factors that affect their service life. Therefore, the development of carbon bricks for blast furnaces with excellent resistance to molten iron erosion, oxidation resistance, and high thermal conductivity is of great significance for extending the lifespan of blast furnaces and ensuring blast furnace production.
The existing carbon bricks for blast furnace are usually made of anthracite, graphite and petroleum coke as the main raw materials, asphalt as the binder, and calcined at different temperatures. Due to the high volatility of asphalt and low residual carbon content, the strength, thermal conductivity, and melt loss resistance of carbon bricks prepared with existing technology for blast furnaces decrease; The use of resin as an additive or binder can facilitate the molding of products at low or normal temperature, but it will significantly increase the cost. In addition, the amorphous glassy carbon is formed after the resin is carbonized, which has low thermal conductivity and carbon residue rate, greatly reducing the thermal conductivity of carbon bricks.
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