绿色矿冶

In this paper, by analyzing the external force of flow field and the force between particles, the mechanical causes of particle migration behavior during pipeline transportation of suspension system are summarized, the influencing factors of particle migration behavior are analyzed, and the particle migration models with different particle sizes based on mechanical mechanism are summarized. The external forces of the flow field on the particles during pipeline transportation include gravity, viscous force, buoyancy, Saffman lift, Magnus lift, etc. The inter-particle forces include van der Waals force, electrostatic force, liquid bridge force, friction force and collision force. Under the combined action of the external force of the flow field and the inter-particle force, the particles in the shear zone of the pipe wall migrate to the plunger flow zone in the center of the pipe, and the fine particles in the center of the pipe migrate to the vicinity of the pipe wall. The research in this paper can clarify the internal mechanism of the formation of plunger flow structure and side wall slip layer in the current paste filling pipeline transportation process, and provide theoretical guidance for the mine paste filling process.