Toncin thickener is a new High-rate thickener with central-drive, automatic lifting rake that we have developed based on foreign technology .It is widely applicable to treatment of various industrial feed pulp, like coals, metal ore dressing water,metallurgy, chemical, tailings treatment, environmental protection etc. This thickener consists of round thickener and harrow scrapping machine, the solid particles suspend in thickener settling by gravity, the pulp in the upper turn into clean water, so that the separation can be realized. Slime that sediment in the bottom of the thickener is discharged by the harrow scrapping continuously, and clean overflow from the upside.