首页|Study on Chrome-free Purging Plugs for Steel Ladles
Study on Chrome-free Purging Plugs for Steel Ladles
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Purging plug refractories in China typically contain around 3 mass％of super-fine chromium oxide in the matrix in order to improve the performance of the purging plugs,primarily,slag corrosion and wear resistance.Alternatives to chromium oxide containing refractories have gained interest due to health concerns related to the formation of soluble chromium compounds over long storage periods of refractory wastes.Super-ground reactive alumina can replace chromium oxide in purging plug refractories and this paper discussed the new reactive alumina E-SY 88 in comparison to chromium oxide in a typical purging plug castable.The mixing behaviour,wet castable properties,as well as cured,dried,and fired properties at different temperatures up to 1 600 ℃ were compared.In addition,the hot modulus of rupture,creep behaviour,thermal shock resistance and slag corrosion resistance were tested.The microstructure after slag corrosion was investigated by SEM.The results prove that E-SY 88 is an economically viable technical alternative to chromium oxide in purging plug refractories.
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