Dense refractory brick is a kind of siliceous clay rich in hydrated aluminum silicate. It has the ability of no deformation, no fragmentation, no softening and no paste at high temperature. There are many kinds of refractory bricks in the amorphous material sector. The basic quality requirements for product consumption are alumina higher than 38% and low iron and low alkali metal content. These products may not be calcined or calcined, such as refractory clay, plastic for overload, high alumina plastic, refractory clay and high aluminum oxide castables, etc.