Abstract: Total tailings backfilling is currently the main development trend of backfilling technology.And the researchers both at home and abroad have done intensive trial work on hydraulic calculation for total tailings, and have found empirical formulas of different forms.This paper describes in detail the calculation process for entire tailings transport: firstly, to make a test on the nature of the tailing so as to determine its volume ratio, density, average particle size, settling velocity when it leaves the concentrator; then to determine the flowrate, critical velocity and the relevant pipeline diameter in order to determine the hydraulic gradient and friction coefficient; and finally, to decide on the pumps to be used according to the flowrate, lift and total head.In the meantime of calculation process description, the paper also explains the relevant concepts and recommends a reasonable formula according to the actual situation.Compared with the conventional multi-scheme comparison method, this method of hydraulic calculation for transporting total tailing slurry at high head difference has the advantage of simple and accurate calculation.It is also of guiding significance to the optimization of general pipeline transport schemes.

Key words: Tailing transport, Hydraulic calculation, Critical settling velocity, Pipeline resistance