Washed kaolin is made by adding water to raw materials, mixing them into a slurry, then undergoing sedimentation separation and drying. It becomes a mineral with kaolin properties, and due to its white color, low cost, good fluidity, stable chemical properties and large surface cation exchange capacity, it is widely used as a filler in coatings and paints, as well as in firebricks, silica-alumina wool, cosmetics and medicine.