Abstract: In order to reduce cost and increase efficiency，aiming at the problems of poor circulating water quality，high cost of tailings fluid transportation，complex process and old equipment，the original six ϕ50 m peripheral transmission thickeners were changed to one HRT ϕ63 m high efficiency thickener，and the new flocculant PAM（A456 L）was selected for tailings flocculation test. By reducing the amount of flocculant dry tail to 20.13 g/t，the underflow concentration of thickener is increased to more than 40%，which greatly shortens the process flow and reduces the number of equipment，significantly improves the quality of circulating water，saves 7.59 million t/a of clean water，reduces the energy consumption of tailings and circulating water transportation，improves the automation level，realizes the unattended concentration system， optimizes the personnel structure of the concentrator，and has remarkable economic benefits.

Key words: tailings, concentration of pupl, thickener, pump of underflow, circulating water