Wastewater treatment tank for preparing calcium carbonate rod-like nanoparticles

The utility model discloses a wastewater treatment tank for preparing calcium carbonate rodlike nanoparticles. The wastewater treatment tank comprises a supporting plate, a cylindrical barrel, a screw conveyor and a sedimentation tank, an annular gear is arranged in the middle of the outer side face of the cylindrical barrel, a stepping motor is arranged in the middle of the upper surface of the supporting plate, an output shaft of the stepping motor is meshed with the annular gear through a gear, a control switch set is arranged on the upper surface of the supporting plate, and an annular baffle is arranged on the right end face of the cylindrical barrel. Waste water generated in the calcium carbonate rod-like nanoparticle preparation process can be rapidly and efficiently filtered, the filter screen is automatically purged, the filter screen is effectively prevented from being blocked, solid particles generated in the filtering process can be conveyed out through the screw conveyor, the cylindrical filter s