The rotary calciner is modified on the basis of conventional rotary dryer by changing the form of its heat source. An arched heating device (stacked kiln body) is added outside the middle section of the cylinder of the traditional rotary cylinder dryer, and the cylinder is heated by a plurality of burners distributed around the circumference of the kiln by burning a heat source such as natural gas. The treated material is discharged from the lower end by the inclination of the cylinder.
The material enters the furnace through the kiln head feeder, and an arc-shaped heating device (stacked kiln body) is added outside the middle portion of the cylinder. The furnace is equipped with a fuel burner or an electric heating element, and the flame of the burner or current of the electric heating element is adjusted by an automatic control system to control the temperature of the furnace so that the material is calcined at a certain temperature, and the calcination time can be controlled by adjusting the rotation speed of the furnace. The treated material is discharged from the lower end by the inclination of the cylinder.
It has been successfully applied to the calcination of molecular sieve, catalyst, alumina, ternary material, precursor, Li-ion battery materials, oil sand, fly ash, chrome ore, chrome ore powder, cement clinker, active lime and light calcined dolomite.