Date of Award

8-1993

Degree Name

Master of Science

Department

Chemical and Paper Engineering

First Advisor

Dr. Raymond L. Janes

Second Advisor

Dr. David K. Peterson

Access Setting

Masters Thesis-Open Access

Abstract

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.

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