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The electric furnace roof is generally made of high-alumina refractory materials. In the past, the electric furnace cover was mostly built with refractory bricks. Nowadays, high-alumina castables are mostly used for integral casting on site or prefabricated off-site. The castables for electric furnace cover mainly use corundum and bauxite as refractory raw materials, add mullite and other admixtures, and prepare according to the formula proportion.
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The furnace roof of the electric furnace is a spherical structure with electrode holes and smoke exhaust holes. The outer ring part is called the main furnace cover, and the middle part is called the small furnace cover (also known as the triangle area). The furnace cover can be removed when charging.
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The furnace shell is usually cylindrical, with a frusto-conical bottom underneath, and a spherical disc-shaped bottom for good strength. The furnace shell bears the weight of the furnace lining and metal, as well as the thermal stress caused by the thermal expansion of the furnace lining. Generally,
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