The furnace lining furnace mouth is continuously impacted by cold and hot molten steel, so the refractory material used for the furnace mouth must be resistant to the erosion of high-temperature slag and high-temperature exhaust gas, and is not easy to hang steel and easy to clean in time.
The furnace cap is not only subjected to severe slag corrosion, but also to the rapid cooling and rapid heating temperature changes, as well as the combined effect of the high-temperature air flow due to carbon oxidation and the scouring of dust and high-temperature exhaust gas. The charging side requires magnesia carbon bricks not only to have high slag corrosion resistance, but also to have high high temperature strength and very good anti-stripping performance. Therefore, high-strength magnesia-carbon bricks with metal antioxidants are usually used. Research shows that , the high temperature strength of magnesia-carbon bricks added with metal aluminum at lower temperature is lower than that of the samples with composite addition of metal aluminum and metal silicon, but at high temperature, the high temperature strength increases instead.
The slag line is the three-phase junction of the furnace lining refractory material, the high-temperature molten slag and the furnace gas, and it is the most serious part of the slag corrosion. Therefore, it is necessary to build magnesia-carbon bricks with excellent slag corrosion resistance, and the slag line needs to have a higher carbon content.
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