Why does alumina collapse in one process of brick making and firing?

What you want to ask is why the alumina produced by brick-making and firing method collapses. It is caused by too wide particle size distribution and too large particles of alumina powder. The deformation of alumina produced by brick-making and firing A process during calcination is caused by the wide particle size distribution and large particles of alumina powder, as well as the unreasonable selection and dosage of additives in alumina powder. Brick-making and firing is a traditional brick-making process, which is made by mixing clay and other materials, then pressing the mixture into a brick blank, and finally firing at high temperature.