Production practice has shown that appropriately increasing the size and quantity of coarse particles in high alumina bricks can improve the bulk density of the clay material and make it easier to form. During firing, the secondary mullite reaction around the material is weak and easy to sinter. However, there is also a certain limit to enlarging the particle size of high alumina bricks. If enlarged to 4-5mm, it is prone to missing edges and corners, and the uniformity of tissue organization is affected. Therefore, a particle size of 3mm is recommended.
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