Swirling-coarse graining-settling dehydration device

The utility model discloses a swirling-coarse graining-settling dehydration device, comprising a coarse graining treatment device and a settler, wherein the coarse graining treatment device comprises a swirler which is provided with a liquid inlet, an overflowing opening and an underflow opening, the overflowing opening and the underflow opening are outwards connected with an overflowing pipe and an underflow pipe respectively, the tail ends of the overflowing pipe and the underflow pipe are connected with each other and connected with a mixed liquid pipe, and the other end of the mixed liquid pipe is connected with the settler. The swirling-coarse graining-settling dehydration device integrates three separation methods (coarse graining separation method, swirler separation method and thermo-chemical settling method), retains the advantages of the three methods but discards the disadvantages; the device disclosed by the utility model is simpler than the coarse graining separation method, easier to control than the swirler separation method and more efficient than the thermo-chemical settling method, ensures the small size, reaches the requirement for stable production operation and has the beneficial effects of greatly reducing the construction cost of separation facilities and lowering the operation cost.