The main reasons for the damage of converter lining are as follows:

Mechanical action. The impact and erosion of scrap steel and molten steel on the lining, the erosion and wear of molten steel and gas flow on the lining, the mechanical damage of cleaning the slag in the furnace mouth, etc.

High temperature reaction. In particular, the high temperature action in the reaction zone will soften and melt the lining surface;

Chemical erosion. The oxidation and chemical erosion of lining caused by high temperature slag and gas are serious.

The lining is peeling. The spalling of lining bricks caused by thermal vibration and the lamination caused by the decomposition of mineral components of lining bricks themselves.

Measures to protect the lining and improve the lining age:

Improve the quality of masonry. The laying quality of the lining of the converter is the foundation of the furnace age. First, the quality of the lining bricks (including specifications, dimensions and performance) must be qualified, and then the lining laying should be carried out strictly according to the technical requirements.

Optimize smelting operation process. The composition of molten iron and the process system have an impact on the life of the lining. For example, when the Si content in molten iron is high, the SiO content in the slag is correspondingly high, and the erosion and scouring of the lining will also be intensified.

Strengthen furnace body maintenance. Slag splashing furnace protection is the main means of maintaining furnace lining in daily production, but other maintenance methods are determined according to the damaged parts and degrees of road lining bricks. The maintenance of the bottom of the furnace is mainly to repair the furnace, determine the damaged thickness, and repair the furnace with mending materials, which are magnesium cold mending materials or mending bricks. The surrounding charging side can be maintained by combining spraying and charging. The steel outlet should be replaced or padded with charging material according to the damage condition; Trunnion and slag line parts can only be repaired by spray repair.