Date of Defense

Spring 4-22-1989


Deinking is a process being used throughout the paper industry. Flotation deinking consists of introducing chemicals into the raw stock that will separate the ink particles from the fibers and promote the attraction between the ink particles and air bubbles. The chemicals used in the process are alkalies, dispersants and bleaching agents. It has been recognized that optimum flotation conditions can be achieved by controlling certain operating parameters in the flotation cell. Air bubble size and quantity of air present during deinking are included among the factors influencing flotation efficiency. Although several studies have been published on the influence of chemical additives on the deinking process, little is known about the mechanisms or even the relative significance of the various unit steps. Because of this, the purpose of this project is to examine the effects of bubble size and air quantity on flotation deinking efficiency in order to gain a better understanding of the variables influencing a flotation deinking system.

Access Setting

Honors Thesis-Campus Only