What are the materials used for rotary kiln calcination? How about the calcination process?

2023-08-22

Rotary kilns were initially used in construction materials and equipment, mainly for calcining materials. Due to their complex properties and a large amount of calcination waste, a dedicated rotary kiln was developed. But with the widespread application of rotary kilns in many industrial fields and their increasing importance in these production, they have become the core equipment of corresponding enterprises' production. There are countless materials that can be calcined, and the calcination process is reliable.

What are the materials used for calcination in rotary kilns

1、 Calcinable materials

The rotary kiln is composed of a rotating cylinder, a supporting device, a supporting device with a blocking wheel, a sealing device at the kiln head and tail, and a coal injection pipe device. 90% of the accessories are made of high wear-resistant materials, and the kiln head is sealed with a shell cover. The kiln tail is equipped with an axial contact sealing device, ensuring the reliability of the sealing. Due to the low requirements of material properties for rotation, the range of kiln calcination is relatively wide. Suitable for materials such as white ash, cement, lime, nickel iron, nickel ore, zinc oxide, magnesium oxide, bauxite, dolomite, magnesite, titanium dioxide powder, and ceramic sand. The calcined material product is uniform and the yield is as high as 98%.

2、 Calcination process

The rotary kiln calcination process can be divided into wet and dry methods, which are selected based on the properties of the materials. Usually, a wet process is used. During the production of wet rotary kiln, water is added to the raw material mill to make a slurry with a water content of about 3% 5. The slurry that meets the requirements after homogenization is sent to the kiln by the kiln head feeder for calcination into clinker. The discharged clinker is cooled by a cooling machine and sent to the clinker silo. The raw coal is dried and ground into coal powder, which is then burned to supply the required heat for clinker calcination.

The characteristics of the wet calcination process in rotary kilns include uniform production, stable process, high quality of fired clinker, high strength grade of clinker, less dust during the grinding process, and less fly ash at the kiln end. However, compared to dry production lines, wet production requires a significant amount of heat to evaporate 35% of the slurry water, resulting in a high water consumption and consumption of water resources. However, currently our company has overcome this problem by producing new research and development rotary kilns, while traditional ones do not. It is necessary to inquire clearly when purchasing.