关键词: 废钢, 铁水包, 耐火材料, 铝碳化硅碳砖

Abstract:

The abnormal corrosion of hot iron ladles was investigated.The performance,the composition and the structure of bricks for the hot iron ladles were analyzed.The results show that (1)compared with the alumina-silicon carbide-carbon bricks for the ladle bottom,those for the ladle wall have more pyrophyllite and the Al₂O₃ content of 36.32 mass%;their bulk density,apparent porosity and compressive strength are all lower than the requirement of industry standards;they have poor oxidation resistance and are oxidized to form a porous layer during service,which loosens the brick lining structure thus leading to fracture,local wear and structural damage of bricks;(2)without heating,steel scrap is not completely melted,resulting in slag or steel attachment at the mouth or the bottom of ladles thus increasing damage of ladles;(3) and the residual bricks react with the attached slag to form low melting point phase affecting their hot properties.The refractories for the lining of hot iron ladles must be improved in combination with process changes,not entirely by raw materials replacement to reduce costs.

Key words: steel scrap, hot iron ladles, refractories, alumina-silicon carbide-carbon bricks