Fines Removal Research Articles

Kinetics of continuous agglomeration in suspension

The kinetics of agglomeration in suspension were studied in a system with three stirred vessels in series. A suspension of CaCO 3 in water was agglomerated using kerosene as a binding liquid and oleic acid as a surface-modifier. In the first vessel in which the feed flows enter, the process appears to be dominated by the interaction of fines and binding liquid. This applied both to fines removal and agglomerate growth The process in the second and third vessels was described satisfactorily as a layering process of fines onto the existing agglomerates. In all cases, quantitative descriptions could be given. It appeared that the kinetic data of the continuous process can not be obtained from batch experiments.

Size-distribution control of a classified product crystallizer with fines removal

Size-distribution control of a classified product crystallizer with fines removal

Stability of the class II classified product crystallizer with fines removal

AbstractThe stability of crystal‐size distribution (CSD) in the classified product crystallizer with fines removal was investigated using spectral techniques to determine stable solutions of the linearized population balance. The model used to describe the crystallizer assumed rapid growth kinetics (high yield), magma‐dependent secondary nucleation, and recycle of dissolved fines. Fines removal and classified product removal were characterized in the model by piece‐wise constant removal rates (R – 1) and z times the MSMPR removal rate, respectively.Stability regions were presented as critical values of the kinetic nucleation/growth rate exponent i = d(log B°)/d(log G) versus dimensionless parameters of the system. The parameters which influence CSD stability were maximum fines size and removal rate, product classification size and removal rate, and the magama‐characterizing exponent in the nucleation expression. Whether or not dissolved fines are recycled directly back to the crystal magma also influences stability.