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Dynamic simulation approach can be used for understanding the nonlinear behavior in mineral processing circuits.In this study,the gel point,the main parameters of batch flux density function and the main parameters of effective solid stress were determined at different conditions (pH,flocculant dosage and particle size).Therefore,the main parameters of phenomenological model of sedimentation and thickening were determined as a function of particle size,pH and flocculant dosages using the result of experimental tests and Curve expert professional software.Then,the dynamic simulation was carried out for the industrial thickener of coal washing plant and the time-dependent variation of response variables was investigated by time-dependent variation of pH of input feed to thickener using the obtained equations.It was observed that it is possible to predict the thickener behavior as a function of time for time dependent variation of pH of input feed to the thickener of coal washing plant using obtained equations that it was not possible using phenomenological model of thickener alone.