The gravity separation and purification process mainly uses the density and particle size differences between kaolin and gangue minerals to remove light organic matter and high-density impurities containing elements such as iron, titanium and manganese to achieve the purpose of purifying kaolin and reduce or remove impurities. negative impact on its whiteness. Using a small cone angle cyclone group or centrifuge to replace the washing and screening operations in the kaolin purification process can not only achieve the purpose of washing and classifying, but also remove some impurities, which has good application value, but at the same time it must also be considered It is difficult to obtain the final kaolin product that meets the requirements through the gravity separation process alone. After gravity separation and purification, calcination, magnetic separation and leaching are still required to obtain the final qualified product.