A conical settlement barrel is used to study the group fall velocity of non-uniform particles, which allows the current to flow from the bottom to the top, with particles suspending in the flow. The average flow velocity at the cross section is regarded as the settling speed of the particles. A formula of group settling velocity for non-uniform particles is obtained by analyzing the experimental data. Also, a preliminary study on the group fall velocity of each size of non-uniform particles is carried out, and fall velocity formulas for various size groups are obtained. The group settling velocity formulas agree well with various data for non-uniform particles with relatively high reliability and accuracy.
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