Refractory clay refers to bauxite above 1580°C, which can be used as refractory clay refractory material. In addition to its high refractoriness, it maintains volume stability under high temperature conditions, and it has slag resistance, thermal shock resistance, and certain mechanical strength, making it exceptional after roasting.

The plasticity of refractory clay and the industrial use of ore are four characteristics of soft clay, semi-soft clay, hard clay and high alumina clay. Generally simple soft clay, water-dispersible, can be formed after being plastically mixed with liquid clay; scattered and poor semi-soft clay dipped in bulk can also be formed after being plastically mixed with liquid clay. These two clays are often used as binders in the production of refractory products. Clay usually has a hard block or flat shape, generally does not stick to water, has high refractoriness, and is the main raw material for refractory products. The Al2O3 content of high alumina clay has high hardness, high refractoriness, and high proportion of clay used to make products.