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Erosion of ceramic cup and carbon brick for blast furnace hearth with dynamic molten slag iron
Pages: 13-17
Year: Issue:  3
Journal: Research on Iron and Steel

Keyword:  blast furnace hearthceramic cupcarbon brickerosion of slag-iron;
Abstract: The experiments of erosion of hearth bricks from dynamic molten slag iron were done to simulate the slag iron flow environment in blast furnace hearth.Two common kinds of ceramic cups and two kinds of high thermal conductivity carbon bricks were used as experimental samples.The different erosion effects of molten slag iron on ceramic cups and carbon bricks were investigated through macroscopic profiles,erosion mass and microscopic structures of the samples.The different erosion regions were divided and discussed.It was found that the hearth bricks would be eroded inevitably if they were contacted with molten slag iron directly.For ceramic cups,the slag-iron erosion region had the most serious erosion.The erosion of carbon bricks was relatively uniform,and there was no obvious slag-iron erosion region for carbon bricks.The erosion degree was intensified when the rotational speed of samples was increased from25r/min to 50r/min.Slag-iron circulation would aggravate the erosion of hearth lining.In order to prevent the erosion of hearth lining from molten slag iron,the slag iron erosion resistance of bricks should be improved.It was important to maintain reasonable molten slag iron flow and reduce the circulation of molten slag iron in hearth.
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