Flint clay clinker (hard clay clinker)
　　Hard clay clinker refers to the calcined clay refractory raw material. The appearance is white or nearly white. It is the main raw material for the production of refractory products.
　　Usage：
　　1. The main raw material of refractory products.
　　2. As a raw material for the manufacture of daily-use ceramics, architectural ceramics and industrial ceramics.
　　3. Used as a building material.