Abstract
Several commercial flocculants have been tested with coal slurries in batch settling experiments in order toestablish a quantitative criterion for their selection in preliminary design and throughout plant routines. Statistical analysis of the data using the quadratic Yates method allows the correlation to be made between two functions: settling rate and concentration of the thickened slurry, chosen to represent the effectiveness of flocculation-sedimentation, and three parameters: concentration of particles, dosage of the additive and intensity of mixing selected as design or controlled variables. This protocol, though generally applicable, was carried out for brown coal slurry and a given commercial flocculant.
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