Patent ID: 8057736

Claim:
A hearth structure of a rotary furnace hearth comprising: a hearth refractory bed of a rotary furnace hearth; side blocks built at an inner circumference end and outer circumference end of the hearth refractory bed; two or more layers of refractories disposed between the side blocks built at the inner circumference end and the outer circumference end of the hearth refractory bed and a powder or pellet hearth material disposed on a top surface of the layers of the refractories, wherein the refractories laid at a topmost layer directly contact each other and have a compressive strength of 0.1 to 5 MPa at 800 to 1500Â° C., and the side blocks, comprise refractories having a compressive strength of 8 to 130 MPa at 800 to 1500Â° C.