Integral Casting Application for Repairing the Eroded Hearth of Shougang No.1 BF
In the later campaign stage of No.1 BF of Shougang Co.,Ltd,the hearth temperature measured by the thermocou-ple is 689℃ at the point,and the theoretically calculated remained thickness of the eroded carbon bricks on the side wall of the hearth is 400mm.For efficient and safety operation of the furnace,integral casting is used for repairing the hearth under the precondition of remaining the residual carbon brick,and such casting is carried out in three steps considering different parts of the hearth,i.e.casting of ceramic cup bottom,casting of the ceramic cup side wall and casting of the tuyere area.Additionally,the furnace parts of the belly,bosh and stack are relined by gunning.After blow-in,the temperature of the re-paired hearth sidewall keeps at 250 ℃ app.,signifying that the brittle fracture portion of the carbon bricksis enclosed by the castable.The furnace,then,runs stably and smoothly,its main techno-economic indicators improve steadily,and particular-ly,the furnace achieves high production and low consumption in October 2022.
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