Zinc concentrate fluidized bed roaster and technological method for reducing zinc ferrite

The invention discloses a zinc concentrate fluidized bed roaster and a technological method for reducing zinc ferrite. The area of a hearth of the fluidized bed roaster is larger than 152 m < 2 >. In the zinc concentrate fluidized bed roasting process, zinc ferrite is mainly generated in an annular area, namely a turbulent flow deposition layer, extending from the inner wall of the fluidized bed furnace to the center line of the fluidized bed furnace by about 300mm. When the area of the furnace hearth is increased, the proportion of the area of a turbulent flow deposition area of zinc ferrite to the area of the furnace hearth is reduced, and the contact area of zinc ferrite generated by ZnO and Fe2O3 can be reduced, so that the generation of zinc ferrite is reduced, and the problem that the cost of zinc per ton is increased due to the fact that zinc ferrite in zinc calcine is too high is solved.