High alumina brick is a kind of middle grade Fire brick among the stereotyped products of refractory materials. It belongs to neutral refractory materials and is used in the lining of industrial kilns.

Clay bricks quality is different indifferent area in China due to the local raw materials level, for example of the clay bricks in Henan, the aluminum content is high and more purity, the body is dense, and the use effect is almost the same as the general three-level high aluminum bricks.

Feeding damage is due to the damage generated when feeding to the intermediate frequency furnace, mainly because some large raw materials did not pay attention to when adding, so that large raw materials from high to add, causing damage to the furnace lining. When feeding, pay attention to the height of the raw material falling, can avoid this damage, at the same time, when adding pieces of block material, need to pay attention to prevent the furnace lining to scratch.