Date of Award
Master of Science
Paper Engineering, Chemical Engineering and Imaging (to 2013)
Dr. Raymond L. Janes
Dr. David K. Peterson
Masters Thesis-Open Access
Three variables: (1) consistency, (2) agitation, and (3) bubble size were studied for their effects on flotation efficiency and fiber loss. Flotation was done by using a Hallimond apparatus. The floated and non-floated portions were quantified by image analysis based on number of ink particles and total area of ink. The percent fiber loss was calculated from solids' weights of both portions. The floated part was analyzed by a KAJAANI instrument for fiber length average and distribution.
The results showed that flotation efficiency increased with agitation but decreased with increasing consistency. Fiber loss increased with consistency but decreased with increasing agitation. Bubble size showed less effect than consistency and agitation. However, increasing bubble size reduced flotation efficiency and fiber loss. Average fiber length in the floated part was longer than the original pulp, indicating that fractionation occurred during the flotation. Increasing consistency reduced average fiber length in the floated part.
Walaipachara, Wiwat, "A Study of Effects of Flotation Conditions on Flotation Efficiency and Fiber Loss" (1993). Master's Theses. 817.