The application of kaolin in the ceramic industry is very extensive. There are mainly two areas, one is used as a plastic raw material in the ceramic body, and used together with other plastic raw materials to make the body have a certain strength and plasticity; the other is used as a glaze on the ceramic surface to make the ceramic surface have certain luster and color.

The application of kaolin in the ceramic body mainly includes the following aspects:

• As a plastic raw material: Kaolin is used together with other plastic raw materials (such as clay, feldspar, etc.) to make the body have certain strength and plasticity. The amount of kaolin generally accounts for 20%-30% of the total amount of the blank.
• As a barren material: Kaolin plays a role in barrenizing in the blank, reducing the shrinkage rate and firing temperature of the blank, and improving the strength and stability of the blank. The amount of kaolin generally accounts for 5%-10% of the total amount of the blank.
• As a binder: Kaolin plays a binding role in the blank, making the various components in the blank evenly disperse to form a stable blank structure. The amount of kaolin generally accounts for 1%-3% of the total amount of the blank.
• As a filler: Kaolin plays a role in the blank, improving the density and hardness of the blank, and reducing the porosity and water absorption of the blank. The amount of kaolin generally accounts for 5%-10% of the total amount of the blank.

The application of kaolin in the ceramic glaze mainly includes the following aspects:

• As a base glaze: Kaolin is used together with other glaze raw materials (such as feldspar, quartz, boric acid, etc.) to form a base glaze. The amount of kaolin generally accounts for 30%-50% of the total amount of the glaze.
• As a flux: Kaolin plays a fluxing role in the glaze, reducing the melting point and viscosity of the glaze, and improving the fluidity and coverage of the glaze. The amount of kaolin generally accounts for 10%-20% of the total amount of the glaze.
• As an emulsifier: Kaolin plays an emulsifying role in the glaze, making the insoluble pigments (such as iron red, cobalt blue, etc.) in the glaze evenly disperse to form a stable suspension. The amount of kaolin generally accounts for 5%-10% of the total amount of the glaze.
• As a gloss agent: Kaolin plays a glossing role in the glaze, making the glaze surface have a certain luster and brightness. The amount of kaolin generally accounts for 1%-3% of the total amount of the glaze.
• As a colorant: Kaolin plays a colorant role in the glaze, making the glaze surface have a certain color and tone. The amount of kaolin generally accounts for 1%-3% of the total amount of the glaze.

In addition, kaolin also has many other applications in the ceramic industry, such as a mold material, a catalyst carrier, an adsorbent, etc. In short, kaolin is an indispensable and important raw material in the ceramic industry, and its properties and quality directly affect the quality and performance of ceramic products.