Prediction of sedimentation and consolidation of fine tails

Sedimentation and consolidation of suspensions of fine particles were analyzed by integrating experimental measurement of properties in a centrifuge with a comprehensive numerical model. The yield stress and settling velocity for tailings from tar sands extraction were determined experimentally as a function of the volume fraction of solids. The evaluated state functions were used to stimulate batch settling and consolidation, and the results compare well with long-term settling tube rests. This approach is very attractive where gravity sedimentation may take many years, and it allows prediction of the rare of clear water production, total time for sedimentation and consolidation, and the maximum concentration of solids. Scaling of the sedimentation between centrifuge and field conditions is discussed Conversion of permeability-void ratio relationships from geotechnical experiments to state functions of hindered settling velocity is demonstrated allowing the use of data derived from a variety of experimental techniques.