Use of lignin in the production of ceramics, refractories and clay bricks is beneficial for processing, product properties and energy consumption, because the dispersing effect supports mechanical homogenisation of the raw mixture and improves workability at reduced free water content.
Consequently, less energy is needed for processing, drying and firing. In addition, the binding property of lignin increases green and final strength, resulting in reduced cracking of the final product.
If greater concentrations of lignins are used, where necessary in combination with other organic materials, the decomposition gases expand the clay mass accordingly during the firing process. A homogenous pore structure is formed.