Kaolin clay dehydration process after sorting bins in the slurry storage reservoir 6 ~ 8h, pH adjusted to 3 to 4, near the point of zero charge of the clay, which clay particles are easily agglomerated. The addition of alum to the pulp contributes to the agglomeration of the clay particles and promotes dehydration. The cylinder filter is a commonly used dewatering device which increases the slurry concentration to 55% to 60%. One of the important functions of the filtration operation is to remove chemicals from the clay. To enhance this work, water spray is often used. Spray drying has become a very effective process in the clay industry, but it is expensive. In recent years, a new filtration process utilizing the electrophoretic properties of charged particles in an electric field has emerged. The kaolin particles are negatively charged at pH > 3 and are surrounded by an oppositely charged ion mist to form an electric double layer. In the electric field, the clay particles move toward the anode, and the counter ions in the ion mist move toward the cathode. When the particles reach the anode, they are used to protect the filter cake formed on the anode film of the electrode. The anode filter cake is further dehydrated by electroosmosis, and the excess water is pumped through the negatively charged filter cake capillary by the electroosmotic principle. The dehydrating agent is used to agglomerate the kaolin particles into large particles, which can accelerate the precipitation rate of the particles, facilitate the dehydration, and reduce the kaolin loss of the fine particles. Therefore, the development of the new high-efficiency dehydrating agent for kaolin is also one of its research directions.

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