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Refractory clay is the main raw material for the production of aluminosilicate refractory materials. Its various refractory clays, soft (semi-soft) clays, and clay shales with fire resistance requirements higher than 1580'C are collectively referred to as refractory clay.
 

Natural refractory clay, usually based on clay minerals mainly kaolinite (A2O3. 2SiO2. 2H2O) as the main component, that is, containing water silicate as the main body, and mixed with free quartz, pyrite, rutile and organic matter Composition of the mixture. This non-mono-mineral is mostly a dispersion composed of particles with a diameter of less than 1.2um.
 

According to the different generation of clay, it can be divided into: primary clay and secondary clay. Primary clay refers to the clay formed by the parent rock (such as feldspar) after weathering, and remains in place. Secondary clay, also known as drifting clay, is a clay that is transferred from other native clays and deposited elsewhere under natural dynamic conditions. Large, high plasticity.

There are two main types of refractory clays used in the refractory industry.
 

① Hard clay is characterized by dense organization, high hardness, extremely fine particles, difficult to disperse in water, and low plasticity. These clays are often light gray, off-white, or gray in appearance. Shell-shaped fractures, some surfaces have a slippery feel, easily weathered and broken into pieces.
 

② Soft (semi-soft) clay is often soil-like, with a soft tissue and good plasticity. The color of this clay varies greatly due to the type and content of impurities. From gray, dark gray, to black; some are purple, light red, or white.