The corrosion of ladle lining refractory is a complex physical and chemical process, which has many influencing factors and interaction. Under the condition of bottom blowing argon, due to the influence of gas stirring movement, the mass transfer process of the interaction between the refractory lining of the ladle and liquid steel and slag becomes more complex and diversified. The mass transfer process of the interaction between the refractory and slag in some parts of the ladle is significantly enhanced, the corrosion phenomenon is more serious, and the service life is significantly reduced.
Therefore, for the bottom blown argon ladle, under the violent stirring of high-temperature liquid steel, the research on the corrosion behavior of refractory lining has important theoretical value and practical guiding significance for prolonging the service life of ladle refractory and the reasonable optimization of ladle refining process.
The following is the analysis of the corrosion condition and influence of the refractory lining of the bottom blown ladle, which shall be collected and sorted by the refractory manufacturer.
(1) When single blowing is adopted, the larger erosion rate is mainly distributed in the slag line area of ladle and the lining of near permeable brick area. The increase of blowing volume will accelerate the erosion of ladle lining in the relatively high-speed erosion area. When using double blowing, the erosion of ladle lining is faster than that of single blowing. With the change of blowing flow, the distribution of ladle lining erosion rate is obviously different. Under the atmospheric flow, due to the interference of double blowing, the ladle lining erosion rate between nearly two permeable bricks increases, and the larger erosion is concentrated in the slag line area and expands in a circular direction. As the permeable brick approaches the ladle wall, the erosion imbalance of ladle lining becomes more and more prominent, and the erosion of near permeable brick lining becomes more and more serious.
(2) When single blowing is adopted, the larger erosion rate is mainly distributed in the lining of near permeable brick area. With the increase of blowing flow, the high-speed erosion area changes into two connected oval areas, moves up to the vicinity of ladle slag line area, and gradually expands the fusion. When using double blowing, the erosion of ladle lining is obviously faster and more widely distributed than that of single blowing. With the change of blowing flow, the distribution of erosion rate of ladle lining is obviously different. When the air volume is small, the erosion is distributed in the adjacent lining areas of the two permeable bricks. Under the atmospheric volume, due to the interference of double blowing, the corrosion rate of the ladle lining between the two permeable bricks increases, and the larger corrosion is concentrated in the slag line area and expands in a circular direction.
As the permeable brick approaches the ladle wall, the erosion rate distribution of the refractory lining of the ladle does not change much, but the erosion rate of the lining of the permeable brick near the ladle increases, and the maximum erosion rate increases from 0.108mm/h to 0.120mm/h. Moreover, the closer the permeable brick is to the lining, the erosion range of the working area near the permeable brick lining of the ladle increases gradually. Therefore, while ensuring the blowing effect, the eccentricity of breathable brick should not be too large, so as to avoid local corrosion of ladle lining and shorten its service life.