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Construction of EAF dry ramming mass(2)


4. In places where steel tapping bricks, furnace doors and other places where molten steel is agitated and scoured severely, it should be rammed strongly and can be appropriately thickened to extend the service life of the refractory materials in these damaged parts as much as possible.

5. After the ramming is finished, cover the ramming mass with 5~10mm thick thin steel plate to prevent the shape of the furnace bottom from being damaged or the waste steel penetrates the ramming mass layer when loading the scrap steel, which may cause the hidden danger of steel leakage. If steel cannot be made in time, 100~200mm thick lime should be placed on the iron plate to prevent hydration of the ramming mass.

When knotting the ramming mass, it must be operated strictly in accordance with the construction requirements to ensure the compactness of the ramming mass, otherwise it will cause the ramming mass to shrink seriously during use, causing a large number of cracks and spalling, resulting in a decrease in life.

The first furnace is very important for smelting, and the oxygen blowing pipe must not be inserted too deep during oxygen blowing and decarburization, otherwise it is easy to cause the ramming material at the bottom of the furnace to turn up and produce big pits. During the smelting of the first furnace, the bottom of the furnace can be covered with a layer of lime, which not only prevents the scrap steel from directly hitting the bottom of the furnace, but also prevents the ramming material from hydrating, and can form slag earlier.

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