Abstract: Aiming at the security and stability problems of Meishan iron mine tailings transportation with high concentration and long distance,the tailings physical properties and pipeline transportation parameters were researched via clear water experiment and loop-pipe experiment.The law of Meishan iron mine tailings transportation with high concentration and long distance,the safe transportation concentration and flow velocity were obtained.Under the appropriate operation parameters,safe and economic tailings pulp transportation with high concentration and long distance could be realized.

Key words: Physical properties, Loop-pipe detection, Critical transition velocity