Date of Award

4-1975

Degree Name

Bachelor of Science

Department

Pulp and Paper Technology

First Advisor

Dr. Stephen Kukolich

Abstract

The purpose of this thesis was to find out if maximum TiO2 retention will always occur in an electrokinetic range of +3 mV, as theorized, regardless of initial electrokinetic values. The systems investigated, included the addition of 5% TiO2 slurries at various positive and negative electrokinetic values to pulp slurries, also at various charges. Even though all 13 systems investigated by handsheet analysis were all run at the same final electrokinetic values of ±4 mV, wide variations in their % retention of TiO2 were found. The scattering coefficient of TiO2 and the conductivity and % light transmission of the water filtrate were also obtained and analyzed for each individual system. Conductivity remained fairly constant in all of the systems, with % light transmission, increasing with an increase in % retention. Scattering coefficients were somewhat higher in those systems having lower % retention.

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