| 摘要 |
An apparatus for cleaning particulate materials which readily sink in water, being slightly heavier than water by removing much heavier particulates and by also removing particulates which either float or sink very slowly in water. Differences in settling velocities in water are used to separate groups of particulate materials, by allowing the particulates to float or settle throu gh two columns (1, 2) filled with water. The columns (1, 2) have water flowing upward at different velocities, or watering flowing upward through one colum n (2) and stagnant water in the other column (1).
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