Date of Award
Bachelor of Science
Pulp and Paper Technology
Employing a Wemco three liter laboratory flotation cell and using the dispersing agent as the independent variable erratic trends suggested that trisodium phosphate and tetrasodium pyrophosphate increase the brightness gain in froth flotation deinking and that trisodium phosphate promotes higher brightness gains than tetrasodium pyrophosphate in concentrations ranging from 0.02 to 0.2 percent, (based on oven dry wastepaper). Conclusions could not be drawn for other salts evaluated and also are definitely not decisive for the two salts described. With a material like wastepaper it is difficult, even with the best endeavor to composit the sample, to obtain a large number of specimens, each of which is truly representative of the composite. It would have been desirable if time had been available, to have worked with a much more extensive experimental procedure.
Christensen, Leif, "An Evaluation of Phosphates as Dispersing Agents in the Deinking of Catalogue Wastepaper by Flotation" (1963). Paper Engineering Senior Theses. 81.