Clay refractory bricks are locally sourced, inexpensive, durable, and have advantages such as fire resistance, thermal insulation, sound insulation, and moisture absorption. The Al2O3 content of clay bricks is generally above 40%, and the Fe2O3 content is less than 2.0-2.5%. The clinker content in the ingredients is 65-85%, and the clay content is 35-15%. Mix the crushed clay and finely ground clinker, and then mix them with granular clinker to form a semi dry mud material. It is formed under high pressure and fired at about 1400 ℃, with good performance. Clay bricks exhibit weak acidity at high temperatures and have slightly weaker resistance to alkaline slag erosion, but they strengthen with increasing Al2O3 content. The thermal stability is better than that of silica bricks, magnesia bricks (see magnesia bricks), etc.