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To further clarify the dewatering performance and torque evolution during the tailings thickening process, a self-made rake was con-nected to a rheometer to monitor the shear stress and torque. The dewatering performance of the total tailings was greatly improved to a solid mass fraction of 75.33％ in 240 min. The dewatering process could be divided into three stages: the rapid torque growth period, damping torque growth period, and constant torque thickening zone. The machine restart was found to have a significant effect on the rake torque; it could res-ult in rake blockage. Furthermore, the simultaneous evolution of the torque and solid mass fraction of thickened tailings was analyzed. A rela-tionship between the torque and the solid mass fraction was established, which followed a power function. Both the experimental and theoret-ical results provide a reference for the deep cone thickener design and operation to enhance the dewatering performance.