Ferronickel electric furnace with magnesium-carbon composite furnace lining

Abstract

The invention provides a ferronickel electric furnace with a magnesium-carbon composite furnace lining. The electric furnace comprises a furnace bottom and a furnace wall, wherein an iron notch and aslag notch are formed on the furnace wall, a graphite ramming mass is arranged on the furnace wall close to the furnace shell, and graphite bricks are arranged close to the graphite ramming mass on ahot surface of the furnace wall. The electric furnace is advantaged in that a slag shell can be formed on the furnace wall graphite brick hot surface of the ferronickel electric furnace to prevent molten iron from eroding and damaging the furnace wall, brick joints are reduced by adopting large masonry, and the molten iron is prevented from eroding the furnace wall along the brick joints, the magnesia carbon bricks are adopted in the upper and lower circumferential areas of the iron notch, so molten iron corrosion resistance of the furnace lining is improved, and defects of easy expansion andeasy peeling of magnesia bricks are overcome; the service life of the ferronickel electric furnace is prolonged to 5-10 years or even longer from original 2-3 years, the overall service life of the furnace lining is greatly prolonged, moreover, maintenance cost is reduced, production efficiency is improved, and economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the field of nickel-iron electric furnaces, in particular to a nickel-iron electric furnace with magnesium-carbon composite lining. Background technique [0002] At present, the lining of nickel-iron electric furnace generally adopts magnesia or magnesia, magnesium-chromium composite lining structure. The linear expansion coefficient of magnesia bricks is as high as 8×10 -6 / °C, because magnesia bricks contain CaO components, which are easy to absorb moisture in the air and cannot be stored for too long, and have poor hydration resistance at high temperatures and are easy to crack. During hydration reactions, the volume expansion rate is as high as 77%. When the temperature changes rapidly, it is easy to generate large stress and easy to peel off. If it is used improperly, it will easily cause cracking of the furnace shell steel plate, especially frequent start-up and shutdown of the furnace will easily cause the magnesia bric...

AI Technical Summary

Problems solved by technology

The linear expansion coefficient of magnesia bricks is as high as 8×10 -6 / °C, because magnesia bricks contain CaO components, which are easy to absorb moisture in the air and cannot be stored for too long, and have poor hydration resistance at high temperatures and are easy to crack. During hydration reactions, the volume expansion rate is as high as 77%. When the temperature changes rapidly, it is easy to generate large stress and easy to peel off. If it is used improperly, it will easily cause cracking of the furnace shell steel plate, especially frequent start-up and shutdown of the furnace will easily cause the magnesia brick to peel off and be damaged. In addition, the magnesia has a high porosity and the molten iron is easy to Infiltration, corrosion resistance of molten iron is average, so the service life of magnesia brick furnace lining is 2-3 years; magnesia and magnesia-chrome composite lining have improved service life compared with magnesia lining, but magnesia-chrome materials have certain pollution to the environment, basically eliminated

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