How to Produce Limestone Powder Granules?

In the realm of industrial production, the transformation of limestone powder into granules is a process that holds substantial significance. This operation not only facilitates easier handling and application of the material but also enhances its utility in various sectors. This discussion delves into the methodologies and machinery involved in this conversion, aiming to provide a thorough understanding for those interested in establishing an efficient production line.

Understanding the Raw Material: Limestone Composition and Preparatory Steps

Before embarking on the granulation process, one must recognize the characteristics of the primary raw material: limestone. Predominantly composed of calcium carbonate (CaCO3), limestone possesses qualities that necessitate specific preparatory measures. Initial processing involves pulverization to achieve a fine powder state, which serves as the baseline for subsequent granulation. Pre-treatment may also include moisture adjustment and segregation of impurities to ensure an optimal starting material for granulation.

Making Rock Phosphate, Limestone, And Dolomite Pellets by Dry Granulator
Making Rock Phosphate, Limestone, And Dolomite Pellets by Dry Granulator

The Role of Granulation Equipment in Limestone Powder Processing

Central to the transformation of limestone powder into granules is the deployment of sophisticated equipment. A pivotal machine in this operation is the double roller extrusion granulator, which employs dry granulation technique—bypassing the need for binder materials. This machine exerts pressure on the limestone powder, compacting it into uniform granules. The significance of this equipment lies in its efficiency and ability to produce granules with consistent size and shape, which are crucial for the material’s subsequent applications.

Why Incorporate a Horizontal Mixer and Vertical Crusher in Your Production Line?

For a production line aiming at superior quality limestone granules, the inclusion of a horizontal mixer and a vertical crusher becomes indispensable. The horizontal mixer ensures thorough blending of limestone powder before granulation, promoting uniformity in the final product. On the other hand, the vertical crusher plays a crucial role in size reduction and homogenization of the raw material. These machines, when combined, contribute to a streamlined process flow, enhancing the overall efficiency and output quality of the granulation line.

Simple NPK Fertilizer Granulation Line
Simple NPK Fertilizer Granulation Line

Enhancing Production Line Efficiency: The Importance of Equipment Selection

Selecting the appropriate machinery is paramount for achieving an optimal production line for limestone granules. Equipment such as double roller extrusion granulators, horizontal mixers, and vertical crushers should be chosen based on their performance, durability, and compatibility with the limestone processing requirements. Furthermore, attention should be given to the scalability and flexibility of the equipment to accommodate future expansion needs and variability in production demands.


The journey from limestone powder to granules involves meticulous planning, understanding of the material properties, and the strategic deployment of specialized equipment. By prioritizing the selection of high-performance machinery and adhering to best practices in material preparation and process execution, one can establish a robust production line. It is in this context that Yushunxin emerges as a professional manufacturer of fertilizer equipment, offering solutions that cater to the intricate needs of limestone granulation. Their expertise and product offerings represent a valuable asset for those aspiring to excel in the production of limestone granules. You can visit:

How to use drum granulator to make large scale limestone pellets

Introduction to Drum Granulator Technology

Drum granulators are extensively used in the industrial sector for transforming fine powders into granules or pellets. They are especially useful in the large-scale production of limestone pellets, which are often employed in soil conditioning, water treatment, and as a component in various manufacturing processes. The drum granulator’s rotating action allows raw materials like limestone powder to form into small, rounded pellets through a combination of moisture, heat, and tumbling action.

The Basics of Drum Granulation

Understanding the Equipment

A drum granulator machine is a large cylindrical machine that rotates on a slightly inclined axis. The interior of the drum features flights or lifters that lift the material and then drop it in a cascading motion. This motion, combined with the addition of a liquid binder, causes the fine limestone particles to agglomerate into larger pellets.

Preparing the Limestone

Before the granulation process begins, the limestone must be ground into a fine powder. This powder is then sieved to ensure uniform particle size, which is crucial for consistent pellet quality. Any large chunks or foreign materials must be removed to prevent equipment damage and ensure a high-quality end product.

The Drum Granulation Process

Feeding the Material

The granulation process starts with feeding the finely ground limestone powder into the drum granulator. The feed rate should be controlled to maintain a consistent flow, as this will affect the quality of the pellets.

Adding Moisture and Binder

As the limestone powder tumbles inside the drum, a controlled amount of water and binder is sprayed onto the material. The binder helps the limestone particles adhere to each other, while the water activates the binder and assists in the formation of pellets. The exact formulation and quantity of binder and water depend on the limestone characteristics and the desired pellet size and hardness.

Granulation and Growth of Pellets

Inside the drum, the combined action of the tumbling motion and the addition of moisture and binder causes the limestone particles to stick together and grow over time. The rotary motion ensures that the pellets remain relatively spherical and uniform in size. And we have other limestone powder granulator equipment for your choice. If you are interested in it, please contact us.

Drying and Hardening

After the pellets have formed to the desired size, they need to be dried to reach the required hardness and stability. The granulator may be equipped with a drying zone, or the pellets might be transferred to a separate dryer. Careful control of the drying temperature and duration is essential to prevent cracking or deformation of the pellets.

Post-Granulation Steps

Cooling the Pellets

After drying, the limestone pellets are often too hot to handle or package. They are therefore cooled, typically using a rotary cooler, to bring them down to a safe and stable temperature.

Screening and Separating

The cooled pellets are then screened to separate the properly sized pellets from the undersized particles and oversized agglomerates. The undersized material can be recycled back into the granulation process, while the oversized pellets might need to be crushed and reprocessed.

Packaging and Storage

Finally, the finished limestone pellets are ready for packaging. They can be packed in bags, totes, or bulk containers, depending on the scale of production and the needs of the customers. Proper storage is important to protect the pellets from moisture and other environmental factors that could compromise their quality.

Conclusion: Advantages of Drum Granulation for Limestone Pellets

Drum granulation is an efficient and cost-effective method for producing limestone pellets on a large scale. It offers several advantages, including high throughput, continuous operation, and the ability to produce uniform and high-quality pellets. The process is also relatively easy to control and can be adjusted to meet specific product requirements. With appropriate equipment and process optimization, drum granulators can play a key role in meeting the growing demand for limestone pellets in various industries. And if you want to make 10 t/h limestone pellets, we can also provide you with the best solution.