How to use rotary drum pelleting machine to produce limestone pellets


Rotary drum pelleting machines are a critical component in the production of limestone pellets. These machines offer an efficient, continuous method for agglomerating fine limestone particles into uniformly sized pellets, which can have various industrial and agricultural applications. This passage will provide a comprehensive guide on using a rotary drum pelleting machine for limestone pellet production, covering everything from raw material preparation to final packaging.

limestone pellets granulating production plant
limestone pellets granulating production plant

Raw Material Preparation

Sourcing and Pre-Treating Limestone

The first step in the production process is sourcing high-quality limestone. The limestone should be free from impurities that could affect the pellet quality. Once the raw material is acquired, it often needs to be crushed and screened to achieve a uniform particle size. Typically, limestone particles should be less than 2mm in diameter for optimal pellet formation.

Drying the Limestone

Proper moisture content is crucial for effective pellet formation. Limestone with too much moisture can lead to poor pellet quality, while overly dry limestone can result in dusty pellets. Ideally, the moisture content should be between 8-12%. Drying can be achieved using a rotary dryer or other specialized drying equipment.

Mixing and Conditioning

Adding Binders and Additives

To enhance the binding properties of the limestone, binders such as lignosulfonates, starch, or bentonite are added. These binders help in binding the fine limestone particles into cohesive pellets. Additionally, additives such as de-dusting agents or nutrients can be mixed in to improve pellet properties. The limestone, binders, and additives are then thoroughly mixed to form a homogenous blend.

Conditioning the Mixture

The conditioning step involves adding water to the limestone mixture to achieve the ideal moisture content. This can be done using a spray system integrated into a conditioning drum or mixer. The goal is to create a mixture with a dough-like consistency, which is easier to pelletize. Proper conditioning ensures that the pellets formed will have uniform size and strength.

Pelletizing Process

Feeding the Mixture into the Rotary Drum

The conditioned limestone mixture is then fed into the rotary drum pelleting machine. This machine consists of a large, rotating drum with internal flights or lifters that tumble the mixture, encouraging it to form into pellets. Consistent feeding is key to maintaining a steady production rate and ensuring uniform pellet size.

Forming and Growing the Pellets

As the drum rotates, the tumbling action causes the limestone particles to adhere to each other, forming small seed pellets. With continued rotation, additional layers of limestone adhere to these seed pellets, causing them to grow in size. The drum’s angle, rotation speed, and internal design can be adjusted to control the pellet size and density.

Drying and Screening

Drying the Pellets

Once formed, the limestone pellets need to be dried to reduce their moisture content and increase their strength. This can be done using a rotary dryer or other drying equipment. Proper drying is essential to ensure the pellets are durable and capable of withstanding handling and transportation.

Screening the Pellets

After drying, the pellets are screened to separate them based on size. Oversized pellets can be crushed and reintroduced into the pelleting process, while undersized pellets can be returned to the conditioning step. The screening process ensures that only pellets of the desired size are sent to the final packaging stage.

Packaging and Storage

Packaging the Limestone Pellets

Once screened, the limestone pellets are ready for packaging. Proper packaging helps protect the pellets from moisture and physical damage during storage and transportation. The pellets can be packed in bags, bulk containers, or other suitable packaging materials based on customer requirements.

Storing the Pellets

The packaged pellets should be stored in a cool, dry place to maintain their quality. Proper storage conditions help prevent moisture absorption and degradation of the pellets. Storing the pellets correctly ensures they remain in optimal condition for end-users.


Using a rotary drum pelleting machine to produce limestone pellets involves several stages: raw material preparation, mixing, conditioning, pelletizing, drying, screening, and packaging. By carefully controlling each step, high-quality limestone pellets can be produced that meet specific industrial or agricultural needs. These pellets offer a versatile and efficient way to utilize fine limestone particles, contributing to improved processes and product performance in various applications. Visiting: