Slag resistance of refractories

March 08, 2018

The slag resistance of refractories, referred to as slag resistance, refers to the ability of refractory material to resist the erosion and erosion of slag at high temperature.


Refractories are highly susceptible to slag erosion through chemical or physical chemical action in high temperature metallurgical furnace, melting furnace, calciner, cement rotary kiln and other high-temperature containers. In addition, in many hot air stove, heat exchanger, regenerator and other high temperature heat exchange equipment, or in some reactors and other high temperature installations, refractories do not directly contact with slag. But the solid material in flue gas and dust can be inclined in contact with some gaseous substances can be condensed in refractory material, which can be in high temperature and refractory material formed by reaction of molten contact, or the formation of new products with different properties, or to form a refractory material in some component decomposition, lead to damage of refractories. Generally, erosion of this type of refractories (chemical or physical and chemical erosion as the main cause) is also classified as a slag erosion. It can be seen that slag corrosion is a common, sometimes even the most serious form of damage in the use of refractory materials. Therefore, the slag corrosion resistance of refractory is an important factor affecting the service life of refractories, and it is also an important index to judge the quality of refractory products. Enhancing the slag resistance of refractories is of great significance for prolonging the service life of lining and its masonry, improving the thermal efficiency of such thermal equipment, reducing production cost, reducing pollution caused by refractory materials and improving product quality.

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