During sedimentation tests of putting positive macromolecular polymers into high sediment concentrated suspension of the Yellow River,it approaches the variation rules of morphologic parameters of high suspension flocculation in different flocculation stages with the help of electron microscope observation,image analysis techniques and characteristic parameter of fractal dimension.

The free settling experiments for high-concentration material slurry of cement-full tailing backfill at a different ratio and different concentration are conducted and the effects of the related factors on settling property of the slurry are analyzed.

By comparing the methods of settling experiment and fluidization experiment, it can be considered that the method of fluidization experiment by sampling in cone-shaped tube is a better one at present.