Rotary Kiln

A rotary kiln processes material through physical and chemical reactions as its slowly rotating shell tumbles the charge through hot gas. Applications include cement clinker burning at around 1450°C and limestone calcination to quicklime. Mechanical wear parts are concentrated in the shell support and drive systems.

Equipment Section View

Rotary kiln sectional reference diagram

Equipment Parts

Part Identification and Technical Details

Explore part names, images, material options and technical requirements. Select a card to open the corresponding replacement part page.

Individual parts

Individual and Maintenance Parts

Tyre / Riding Ring / Support Ring

Kiln Tyre / Riding Ring

Material Options: ZG35CrMo / ZG42CrMo cast steel
Installation and Function: Supports the shell and carries its full weight

Roller / Support Roller

Support Roller / Carrying Roller

Material Options: 42CrMo / 35CrMo cast steel, subject to the specified casting grade
Installation and Function: Supports the tyre to keep the shell rotating smoothly

Thrust Roller

Material Options: 42CrMo cast steel, subject to the specified casting grade
Installation and Function: Controls axial movement of the kiln shell

Kiln Shell Liner

Material Options: Heat-resistant cast steel / high-chromium cast iron / SiC castable
Installation and Function: Protects the shell against wear from hot material

Girth Gear

Girth Gear / Bull Gear

Material Options: ZG45 / ZG35CrMo cast steel
Installation and Function: Main gear that rotates the shell

Pinion

Material Options: 40Cr / 42CrMo alloy steel
Installation and Function: Drive gear that meshes with the girth gear

Kiln Inlet / Outlet Seals

Kiln Inlet / Outlet Seal

Material Options: Heat-resistant alloy / flexible graphite
Installation and Function: Prevents air and material leakage

Tyre Support Pad

Tire Pad / Filler Pad

Material Options: Carbon steel / alloy steel
Installation and Function: Spacer that adjusts the clearance between the tyre and shell

Girth Gear Guard

Material Options: Carbon Steel
Installation and Function: Protects the girth gear from dust contamination

$Refractory Lining$

Refractory Lining

Material Options: High-alumina brick / magnesia-chrome brick / SiC castable
Installation and Function: Refractory insulating layer inside the shell

Materials for similarly named parts may differ by OEM, machine model and operating conditions. Confirm the machine model, drawing and measured dimensions before ordering or manufacture.

Material Information

ZG35CrMo / ZG42CrMo are candidate chromium-molybdenum steel grades for heavily loaded support castings. Verify composition, heat treatment and mechanical properties against the grade standard and drawing.
42CrMo: quenched and tempered alloy steel, offering a balance of strength and toughness for suitable support-roller and gear applications.
Select internal metal wear parts and refractory linings separately for temperature, atmosphere, thermal cycling and material attack. Ordinary high-chromium cast iron is not a general solution for the high-temperature burning zone.
SiC castable: a silicon-carbide refractory option for hot, chemically aggressive kiln-inlet feed zones, subject to process compatibility.

Brand Applicability

FLSmidth (FLS), KHD Humboldt Wedag, thyssenkrupp (Polysius), Pengfei, Sinoma, SBM, CITIC

Industry Applications

Cement clinker burning, limestone calcination for reactive lime, alumina calcination, ore magnetization roasting, hazardous-waste incineration and lightweight-aggregate firing.