Novel Bayer process settling tank system

The utility model discloses a novel Bayer process settling tank system which comprises a settling tank, and the side face of the settling tank is fixedly connected with a supporting plate. The secondary washing underflow pipe is connected with the underflow pump at the bottom of the secondary washing tank, after the underflow pump is started, liquid can continuously flow through the secondary washing underflow pipe to drive the impeller to rotate, and after the impeller rotates, the rotating rod is driven to rotate through the transmission rod, the first bevel gear and the second bevel gear; the rotating rod rotates to stir and mix mixed liquid in the filling box, an impeller transmission mode is adopted, resources are saved, efficient mixing efficiency can be achieved, the third-washing overflow pipe conveys the liquid by using the liquid level height difference between the third-washing tank and the second-washing tank as power, the use of an original overflow pump is omitted, and the cost is reduced. A lar