What is rotary kiln?

Rotary kiln can be divided into cement rotary kiln, retorting rotary kiln, metallurgical chemical kiln and lime kiln according to different processing materials. In terms of environmental protection, developed countries in the world use cement kiln to burn hazardous waste. The garbage has been used for more than 20 years. This not only reduces waste pollution, but also uses waste as fuel to save coal powder and recycle waste. In the building materials industry, in addition to calcined cement clinker, the rotary kiln is also used for calcining clay, limestone and slag drying; in the production of refractory materials, the rotary kiln is used to calcine the raw materials to make the dimensional stability and strength increase. Processing in LCDRI, we can provide a variety of different rotary kiln to meet your production needs, please learn more about our rotary kiln use.

The cement rotary kiln is mainly used for calcining cement clinker, and is divided into two types: cement kiln and wet kiln. Ceramsite ceramsite is made from various kinds of clay, slate, shale, coal gangue, and industrial solid waste. The ceramsite kiln is also a ceramsite rotary kiln. This equipment is a high-quality equipment for the ceramsite sand production line, used for calcining raw materials to prepare ceramsite sand. Lime kiln (ie active lime kiln) is used to roast the active lime and light burnt dolomite used in steel plants, ferroalloy plants.

The Application of Rotary Kiln

Waste incineration

Incineration of rotary kiln is an ideal choice for waste containing a variety of difficult to burn substances, or wastes with large changes in moisture.

Sewage sludge treatment

It is applied to high temperature gasification and heats the sludge. The maximum working temperature of the furnace can reach 700 °C.

Contaminated soil treatment
Contaminated soil treatment

Soil contamination can result in soil and land pollution, and affect the health of plants that depend on them.

Cement production line

It is mainly used for calcining cement clinker, first-class cement rotary kiln development and design, with testing and testing methods.

Oil sludge treatment

Floor sludge, tank bottom sludge, drilling mud slurry, treated sludge oil content less than 2%, to meet environmental requirements.

Biomass gasification

Convert biomass into flammable gas, and use flammable gas to drive gas-fired power plants to generate electricity.

Rotary kiln structure

Kiln head section

The kiln head is the discharge part of the rotary kiln, the diameter is larger than the diameter of the rotary kiln, and the seal is realized by the stainless steel fish scales and the kiln body. The main components are the inspection port, the coal nozzle, the trolley, and the observation hole.

Kiln part

It is the main body of a rotary kiln (Retorting rotary kiln), usually 30 to 150 meters long, cylindrical, with 3 to 5 rolling rings in the middle. The cylinders are mostly processed by the factory into 3~10 sections, which are welded by large trucks to the destination and welded. The rolling ring part is also commonly known as (the tire ring) cast from molten steel, and the kiln part of the rolling ring is slightly thicker than other parts of the kiln steel plate due to the bearing capacity. The supporting tug, which is also part of the kiln body and the rolling ring, is connected to the foundation and is the load-bearing pillar of the entire rotary kiln. Usually a set of rollers consisting of two rollers and two retaining wheels. The rotary kiln should be covered with refractory bricks during normal operation.


The kiln tail part is also an important part of the retorting rotary kiln. The shape of the feed end is similar to that of a rotary kiln, which mainly undertakes feeding and sealing.

Rotary kiln support

1. The support frame of the retorting rotary kiln can make our rotary kiln equipment more sturdy, so that it will not shake when working, and stable production.
2. The support frame of the rotary kiln is mainly to fix our rotary kiln equipment, which can prevent the deformation of our rotary kiln equipment when it is used. Everyone knows that the rotary kiln equipment will be shaped if it is improperly operated, so it has such a role.
3. The rotary kiln bracket can facilitate the lifting and hoisting of our rotary kiln equipment and facilitate transportation.

Retorting rotary kiln process flow chart

Rotary kiln structure

Rotary kiln working principle

The cylinder of the rotary kiln is rolled from a steel plate, and the cylinder body is refractory lining, and has a predetermined inclination with the horizontal line. The three wheel belts are supported on the respective support devices, and the cross section near the feeding end wheel A large ring gear is fixed on the inner cylinder by a tangential spring plate, and a pinion gear is meshed therewith. During normal operation, the main drive motor transmits power to the open gear device via the final drive to drive the rotary kiln.

The material is calcined from the kiln tail (the high end of the cylinder) into the kiln. Due to the inclination of the cylinder and the slow rotation, the material moves both in the circumferential direction and in the axial direction (from the high end to the low end), and the process continues. Finally, the raw material is cooled by the kiln head cover into the cooler.

The fuel is injected into the kiln from the kiln head, and the exhaust gas produced by the combustion is exchanged with the material and then exported from the kiln tail. This design is a fuel-free burner.