Wear mechanism of main refractory materials for ladle slag line

Source: | Author:ChangXing Refractory | Published time: 1414 days ago | 1011 Views | Share:

The destruction of the slag line is the most common reason why the ladle cannot be used and needs to be repaired or re-lined. Generally speaking, the operating conditions of the ladle are somewhat similar to that of the converter, but worse than its conditions, mainly due to the larger oxidation and temperature fluctuation range. Carbon oxidation and slag erosion are the two most important causes of damage to the ladle magnesia carbon brick lining during use. In fact, these two factors interact very strongly, and it is sometimes difficult to say which one is more harmful than other.

The wear mechanism of magnesia-carbon lining includes two aspects: one is the melting loss of magnesia particles by slag, such as SiO2, CaO and other oxides and MgO form low-soluble matter, which is caused by the slag.

The second is that FeO in the slag oxidizes the C in the magnesia carbon brick, causing the brick structure to become loose. In addition, during the refining process of molten steel, argon blowing and stirring are carried out, and the molten steel and steel slag are mechanically washed, which intensifies the damage of the slag line. In addition to chemical attack, physical factors, such as vertical cracks and brick joints, often cause slag erosion, resulting in early damage to the slag line and limiting its service life.