Impeller of Model BF flotation cell is composed of the dosed double section cones and it can produce strong slurry cycle downward. Its features are as follows: 1.The capacity of air suction is large, the power consumption is low.2. Every tank has three functions of air suction, slurry suction and flotation simultaneously being unique in flotation return circuit without need for any supplementary equipment, the circuit change is convenient for horizontal location. 3. The slurry cycle is rational, the settlement of coarse sand can be reduced into full play. 4. The regulation is convenient to equip auto and electro-controlling arrangements for slurry level.New structure of tank is employed in Model SF, which is forward inclined, double vanes on the impeller. Equipped with honeycomb duct and dummy bottom, therefore, the slurry in the tank will cycle upward and downward in a fixed flow manner, which is helpful to the suspension of those coarse particles. It can suck the slurry by itself without foam pump.