There are many reasons for the damage of the lining of the castable in the blast furnace tap trench, both internal and external. First of all, the quality problems of the castable lining itself, such as poor material quality and unreasonable material ratio, will lead to a decrease in its durability and easy damage. Secondly, the harsh working environment of the blast furnace tap trench, such as high temperature, high pressure, erosion medium, etc., will cause continuous damage to the lining, making it gradually lose its original strength and stability. In addition, insufficient thickness of the lining or construction defects, such as poor pouring and voiding, can also reduce its durability and make it vulnerable to damage.
The damage of the castable lining is closely related to the working conditions of the blast furnace tap trench. In the tapping process, the erosion and erosion of the lining by molten iron and slag are very strong, which can easily lead to the peeling and cracking of the lining. In addition, the opening and closing times of the blast furnace tap trench are frequent, and the stress and temperature changes of the lining are also large, which is prone to fatigue cracks and thermal shock cracks, which further accelerates the damage of the lining.
In order to extend the service life of the castable lining of the blast furnace tap trench, a series of measures need to be taken. First of all, it is necessary to select high-quality castable materials and reasonable proportions to ensure the quality and durability of the lining. Secondly, strengthen the control of construction quality to ensure that the pouring is dense and there are no defects such as cavities. In addition, the lining is regularly inspected and maintained, and cracks, peeling and other problems are found and dealt with in a timely manner to prolong the service life of the lining. At the same time, the operation and management of blast furnace tap ditch should be strengthened to reduce the erosion and erosion of the lining.