The Drying Performance Of Kaolin

Drying performance refers to the performance of kaolin clay during the drying process. Including drying shrinkage, drying strength, and drying sensitivity.

Dry shrinkage refers to the shrinkage of kaolin clay after dehydration and drying. Kaolin clay generally undergoes dehydration and drying at temperatures ranging from 40-60 ℃ to no more than 110 ℃. Due to the discharge of water, the particle distance is shortened, and the length and volume of the sample will shrink. Drying shrinkage is divided into linear shrinkage and volumetric shrinkage, expressed as the percentage change in length and volume of kaolin clay after drying to constant weight. The drying shrinkage of kaolin is generally between 3-10%. The finer the particle size, the larger the specific surface area, the better the plasticity, and the greater the drying shrinkage. The shrinkage of the same type of kaolin varies depending on the amount of water added, with many resulting in greater shrinkage. In ceramic technology, excessive drying shrinkage can cause deformation or cracking of the body.

Drying strength refers to the flexural strength of mud after drying to a constant weight.

Drying sensitivity refers to the degree of difficulty to which deformation and cracking tendencies may occur during the drying of the billet. High sensitivity, prone to deformation and cracking during the drying process. Generally, kaolin with high drying sensitivity (drying sensitivity coefficient K>2) is prone to forming defects; The lower one (drying sensitivity coefficient K<1) is safer in drying.