A new method of studying the fundamental mechanisms involved in pigment liberation from recycle papers, TAPPI Journal October 2022



Application: Flotation deinking is widely used to remove ink from paper fibers. A prerequisite to flotation is the liberation of ink particles from fibers. We have developed a new method of determining the degree of liberation. The new method will also be useful for better understanding the mechanisms involved in liberating ink particles from paper fibers.

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Author: Kaiwu Huang, Kris Stickland, Aaron Noble, Roe-Hoan Yoon, and Cesar Basilio
A new method of studying the fundamental mechanisms involved
ABSTRACT: Deinking flotation is the most efficient and widely used method of removing ink particles from printed papers to improve the recyclability. A prerequisite for successful deinking flotation is detachment of pigments from paper fibers, a subprocess known as liberation. The degree of liberation is usually determined via hyperwashing tests, which are costly and time consuming. Furthermore, they provide no information on the fundamental mechanisms controlling liberation. In the present work, we developed a new method in which ?-potentials of the particles in a pulp are measured and analyzed. If pigments are not liberated from paper fibers, a frequency distribution plot gives a single peak, while two peaks appear when they are liberated. One can readily determine the degrees of liberation from the peak positions and peak heights. In addition, the ?-potential data can be used to construct disjoining pressure isotherms using the DLVO theory that are useful to better understand the fundamental mechanisms involved and the roles of different reagents used to improve pigment liberation.
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