Backflow type multistage sedimentation rake-free concentrating device

The invention relates to the field of slime water treatment, in particular to a backflow type multistage sedimentation rake-free concentrating device. The device comprises a feeding assembly, a diversion assembly and a clean coal collecting assembly, the diversion assembly further comprises a central tank body, coal slime water with a medicament flows from the upper part of the central tank body to the inner side wall of the central tank body through the feeding assembly, then the coal slime water and the medicament pass through the diversion assembly to flow towards the middle portion of thecentral tank body, after reaction, bubbles carry fine coal slime to move upwards into the clean coal collecting assembly, the clean coal collecting assembly is located above the outlet of the diversion assembly, and is sequentially provided with a central material collecting area, a bubble removing area and a diversion settling area from the middle portion to outside. The backflow type multistagesedimentation rake-free co