Controlling pellet strength in ring die granulators: Key to fertilizer transportation and storage

fertilizer granulator Sep 28, 2025

Pellet strength is a core performance indicator for fertilizer products. Ring die granulators require multi-step control to ensure pellets can withstand the pressure of transportation and stacking, minimizing breakage and loss.

First, consider the raw material ratio. If the organic matter content in production is too high (over 60%), binders such as clay and bentonite should be added (control the amount to 3%-5%) to increase the viscosity of the raw materials and lay the foundation for pellet strength.

If the proportion of inorganic fertilizer is high, the moisture content of the raw materials should be controlled between 14% and 16% to avoid pellet brittleness caused by too low a moisture content and easy sticking to the ring die granulator due to too high a moisture content.

Selecting the ring die granulator compression ratio is also crucial. The compression ratio (the ratio of the ring die aperture to the effective thickness) should be adjusted according to the fertilizer type. For organic fertilizers with high fiber content, a low compression ratio of 1:8-1:10 is recommended to prevent pellets from being too hard and easily broken. For compound fertilizers, a high compression ratio of 1:12-1:15 is recommended to enhance pellet density. During production, regular spot checks can be performed using a pellet strength tester. If the strength is insufficient, the steam supply to the conditioner can be temporarily increased (by 10%-15%).

In addition, the gap between the roller and the ring die should be controlled within a range of 0.1-0.3mm. A gap too large will cause the raw material to slip, resulting in insufficient pellet density; a gap too small will increase wear and affect pellet consistency. By synergistically controlling these three factors, the compressive strength of fertilizer pellets can be stabilized at above 20N, meeting transportation and storage requirements.

How to Improve the Efficiency of a New Two-in-One Organic Fertilizer Granulator

fertilizer granulator Sep 26, 2025

The efficiency of a new type two-in-one organic fertilizer granulator directly affects the production capacity of an organic fertilizer production line. Improper operation can easily lead to problems such as slow granulation and low pelletizing yield. Four optimization strategies can improve both efficiency and quality.

First, proper raw material pretreatment is essential. Strict control of raw material particle size and moisture is crucial: crush the fermented organic fertilizer into a 40-60 mesh fine powder to prevent coarse particles from blocking the equipment’s feed inlet and affecting mixing uniformity. The moisture content should be maintained at a stable 25%-35%. Adjust moisture content by drying or adding dry materials; spray water if too low.

Second, precise adjustment of equipment parameters is crucial. During the mixing process, adjust the agitator speed according to the raw material type: when processing high-fiber raw materials (such as straw fertilizer), adjust the speed to 50-60 rpm to increase shear force; when processing highly viscous raw materials (such as chicken manure fertilizer), reduce the speed to 20-30 rpm to prevent material from sticking to the wall. During the pelletizing process, the pelletizing method should be adjusted to suit different raw materials: for high-viscosity raw materials, use agitator pelletizing, adjusting the disc inclination to 40°-45°; for high-fiber raw materials, use roller compaction pelletizing, increasing the die pressure appropriately.After parameter adaptation, the granulation efficiency of the new type two-in-one organic fertilizer granulator can be increased by 20%-25%, and the granule forming rate is stabilized at more than 90%.

Furthermore, daily maintenance is essential. Before starting the machine daily, inspect the agitator blades and pelletizing die for wear. If blade edge wear exceeds 3mm or the die aperture is deformed, replace them promptly to avoid uneven mixing and uneven pellet sizes caused by aging components. Clean residual material inside the equipment weekly, especially the mixing chamber and the inner wall of the pelletizing disc, to prevent material agglomeration that affects subsequent production. Lubricate transmission components such as bearings and gears monthly to reduce mechanical friction and extend equipment operation.

Finally, optimizing production processes can further improve efficiency. The “immediate recycling of screen residue” model allows the screening of substandard fines directly back to the mixing system through a reflux channel, eliminating the need for manual transfer and reducing waiting time for raw materials. If the organic fertilizer production line requires continuous operation, a raw material buffer can be configured to ensure uninterrupted feeding of raw materials, avoiding frequent equipment starts and stops due to material shortages. After process optimization, the equipment’s effective daily production time can be increased by 2-3 hours, increasing overall production capacity by approximately 15%.

The new type two-in-one organic fertilizer granulator’s complete operating process.

fertilizer granulator Sep 25, 2025

The new type two-in-one organic fertilizer granulator features an integrated “mixing + granulation” design, simplifying organic fertilizer production. Its operations are centered around four core steps, ensuring pellet quality and efficiently supporting the organic fertilizer production line.

The first step is raw material pretreatment. Fermented organic fertilizer (such as livestock manure and composted straw) must first be crushed to a 40-60 mesh fine powder with a moisture content of 25%-35%. Excessively coarse raw materials will result in uneven granulation, while inappropriate moisture content will affect the final product. Meeting pretreatment standards is essential for stable equipment operation.

The second step is the core mixing process. Pretreated raw materials enter the integrated mixing system. A high-strength alloy steel agitator shaft drives the wear-resistant blades, while a variable frequency motor precisely controls the speed between 20-60 rpm. If binders such as bentonite are required, they are added simultaneously. The blades shear and stir the powder, achieving over 90% mixing uniformity within 5-10 minutes, preventing uneven nutrient distribution in the pellets.

The third step is targeted granulation. The mixed material automatically enters the granulation system, where the equipment changes its forming method based on the raw material’s characteristics. Highly viscous raw materials (such as chicken manure organic fertilizer) use a stirring granulation mechanism, where paddles knead the material into 2-4mm pellets. High-fiber raw materials (such as straw organic fertilizer) use a roller-type granulation mechanism, where die extrusion forms the pellets. The stainless steel disc can be hydraulically adjusted from a 30° to 50° tilt angle, and a wear-resistant rubber lining reduces sticking to the wall. The pellet formation rate exceeds 90%, and the pellets are uniformly shaped.

Finally, the screen residue is recycled and connected. After granulation, the pellets pass through an integrated screening device. Qualified pellets enter the drying stage (dried to a moisture content of less than 10%), while substandard fines are returned to the mixing system through a recirculation channel for processing with new raw materials. This design achieves a raw material utilization rate exceeding 95%, reducing waste and ensuring continuous production.

The entire process eliminates the need for frequent manual handling. The new type two-in-one organic fertilizer granulator can complete the entire process from raw material input to qualified pellet output, significantly improving the efficiency and convenience of organic fertilizer production.

Applicable to multiple industries, disc granulators offer a wide range of applications

fertilizer granulator Sep 17, 2025

Disc granulators are not limited to fertilizer production. Their outstanding granulation capabilities make them a valuable tool for a variety of industries, including metallurgy, building materials, and chemicals.

In the metallurgical industry, metal ore powders such as iron ore and manganese ore are processed into granules by disc granulators, facilitating subsequent sintering and smelting processes. This not only improves resource utilization, but also reduces production waste and lowers production costs.

In the building materials industry, disc granulators are used to produce cement raw material granules, ceramsite sand, and other building material granules. The granulation of cement raw materials improves their combustion properties, thereby enhancing cement quality.

In the chemical industry, disc granulators can granulate a variety of chemical raw materials, including catalysts, pigments, and detergents. The resulting chemical products exhibit improved flowability and stability, significantly enhancing product performance and meeting the high standards of chemical production.

New Type Organic Fertilizer Granulator: High-Efficiency Equipment Empowering Multi-Sector Production

fertilizer granulator Sep 16, 2025

In response to the need for industrial upgrading, the new type organic fertilizer granulator (models YSL-60 to YSL-150) was developed by the Agricultural Machinery Research Institute. Leveraging its accumulated experience in compound fertilizer processing and its unique mixing and granulation method, it has become a practical device for granule production in various fields.

In terms of core technology, the new type organic fertilizer granulator utilizes high-speed rotating stirring teeth to stir, impact, and tumble the mixed material within the granulation drum. Friction, centrifugal force, and the material’s viscosity aggregate the material into granules, eliminating the need for complex extrusion equipment and making it suitable for high-viscosity or fibrous materials. Performance parameters include a production capacity of 1-8 tons/hour, motor power of 37-90 kW, and granule diameter of 1-5 mm. The YSL-60 produces 1-2 tons per hour, making it suitable for small and medium-sized operations; the YSL-150 produces 5-8 tons per hour, making it suitable for large-scale production.

It has a wide range of applications. In the fertilizer sector, livestock and poultry manure, straw, and other materials can be transformed into organic, bio-organic, and compound microbial fertilizers, eliminating caking issues while preserving bacterial activity and producing medium and trace element fertilizers. In the chemical industry, it can be used to granulate sticky raw materials; in the pharmaceutical industry, it can process traditional Chinese medicine granules; and in the feed industry, it can produce livestock and aquatic feed, achieving a “one machine for multiple uses.”

The core advantages are significant. Granulated particles are round and uniform, with good flowability, and are less prone to clumping during storage and transportation. Operation is simple, requiring only training. The low motor power and operating costs make the equipment affordable, making it suitable for small and medium-sized enterprises. Furthermore, it preserves fertilizer activity, extending its shelf life to 8-12 months, promoting the recycling of organic waste and achieving both economic and environmental benefits.

Daily maintenance requires three key points: regular inspections: daily inspection of the feed mechanism and transmission system; weekly inspection of agitator tooth wear; monthly bolt tightening and motor temperature monitoring; cleaning the granulation drum after production; lubricating transmission components according to specifications, and timely replacement of worn parts to ensure stable equipment operation.

This new type organic fertilizer granulator, with its multiple advantages in technology, performance and application, is providing strong support for production upgrades in agriculture, chemical industry, medicine, feed and other fields.

Tracked design and efficient turning! Technical advantages of the windrow compost turner

fertilizer granulator Sep 16, 2025

The windrow compost turner’s widespread use in organic fertilizer production stems from the significant advantages offered by its unique technical design. The tracked design is a key advantage. Compared to traditional wheeled equipment, it effectively reduces ground pressure, typically to just 0.05-0.1 MPa. This allows for flexible maneuverability even on muddy, soft surfaces, or complex terrain with slopes up to 15°, eliminating the need for dedicated tracks. This significantly improves site utilization, exceeding that of trough-type compost turning machines by over 30%.

The machine also excels in turning performance. Its hydraulic arm allows for flexible adjustment of turning height and width, accommodating windrows ranging from 0.5-2.5 meters in height and 2-6 meters in width. A single unit can process 50-150 tons of material per hour, achieving an efficiency 1.5-2 times that of a single-screw compost turning machine. The turning teeth and spiral blades are forged from alloy steel. Combined with a bottom-up turning mechanism, this achieves a material turning rate of over 95%, preventing localized compaction and uneven fermentation. Material temperature deviation is kept within 3°C, ensuring stable fermentation quality.

Furthermore, the equipment’s electronic control system monitors operating parameters in real time. In the event of abnormal conditions such as overload or excessive hydraulic oil temperature, it automatically issues an alarm and shuts down the machine for protection, ensuring safe and efficient operation.

Differences in Equipment Selection Between Wet and Dry Granulation in the Fertilizer Industry

fertilizer granulator Sep 15, 2025

In fertilizer production, granular fertilizers are widely used due to their advantages such as ease of application and uniform nutrient release. The differences in equipment selection between wet and dry granulation directly impact fertilizer quality and production efficiency, requiring precise matching based on fertilizer characteristics.

In the fertilizer industry, wet granulation focuses on “liquid-solid granulation,” and equipment selection is designed around nutrient dissolution and granule solidification. Key equipment is a rotary drum granulator or disc granulator. A rotary drum granulator uses a rotating, tilted drum to mix fertilizer powder with liquid raw materials such as phosphoric acid and ammonia, forming granules through the bonding force between the materials. This makes it suitable for producing nitrogen, phosphorus, and potassium compound fertilizers, ensuring uniform coating of multiple nutrients. A disc granulator uses high-speed rotation to generate centrifugal force, which forces the material and binder to form spherical granules. This makes it suitable for fertilizers such as organic fertilizers that require a fluffy structure. A drum fertilizer dryer is required to remove excess moisture from the granules using hot air, preventing fertilizer clumping and nutrient loss. This is a hallmark of wet granulation in the fertilizer industry.

Dry granulation requires no liquid addition, and the equipment used focuses on “physical extrusion shaping,” making it more suitable for heat-sensitive or water-soluble fertilizers. The core equipment is a double roller press granulator, which uses a pair of rollers to press fertilizer powder into dense flakes. This is then crushed and sieved to form granules, preventing moisture from deliquescing in fertilizers like urea and ammonium nitrate, while also minimizing nutrient volatilization. Some high-hardness raw materials require a crusher to pre-process the lumpy fertilizer into a fine powder to ensure uniform feeding. Dry granulation eliminates the need for drying equipment, streamlines the process, and preserves water-soluble nutrients, making it suitable for producing water-soluble or slow-release fertilizers.

When selecting fertilizers, wet granulation equipment is preferred for producing compound fertilizers requiring high nutrient content. Dry granulation equipment is more suitable for processing heat-sensitive, soluble fertilizers. Wet granulation equipment also consumes more energy and is suitable for large-scale production, while dry granulation equipment occupies less space and is more suitable for small- to medium-volume production of specialty fertilizers.

Synergistic application of NPK fertilizer production lines and BB fertilizer mixers

fertilizer granulator Sep 13, 2025

NPK fertilizer production lines are crucial for compound fertilizer production. As a key piece of equipment, BB fertilizer mixers, when integrated with the production line, significantly improve overall production efficiency and product quality. NPK fertilizer production involves processes such as raw material crushing, mixing, granulation, and drying. The mixing stage directly impacts the nutrient balance of the final product, and BB fertilizer mixers are a perfect fit for this requirement.

In the production line, raw materials processed by the fertilizer crusher are delivered to the BB fertilizer mixer via a fertilizer conveyor. Upon startup, the drive system drives the mixing shaft and blades, evenly mixing nitrogen, phosphorus, and potassium, laying a solid foundation for the subsequent granulation process. Inhomogeneous mixing can result in significantly different nutrient distributions in the granulated fertilizer, impacting product quality.

The BB fertilizer mixer’s control system can be linked with the overall production line control system to synchronize parameters such as mixing speed and time, ensuring a smooth production process. After mixing, the uniform raw materials are discharged through the discharge port and sent to the granulator by conveyor. It works efficiently with subsequent equipment such as dryers and coolers to form a complete NPK fertilizer production chain, helping companies achieve large-scale, high-quality production.

Why is the large wheel compost turner considered an “accelerator” for efficient organic fertilizer production?

fertilizer granulator Sep 12, 2025

In today’s pursuit of efficient production, the large wheel compost turner, with its superior performance, has become an “accelerator” for organic fertilizer manufacturers. Its efficiency advantages are reflected in multiple aspects.

In terms of processing capacity, the equipment utilizes a large wheel structure with a main wheel diameter of 5-10 meters, providing a wide turning coverage area in a single turn. It can process 100-200 tons of material per hour, 3-5 times the capacity of traditional windrow compost turners. For example, a base with an annual production capacity of 10,000 tons of organic fertilizer, which previously required multiple units, can now be met by a single large-wheel compost turner, significantly improving production efficiency.

In terms of fermentation efficiency, it uses centrifugal force to thoroughly turn the material to a depth of 1.5-2 meters, evenly mixing the upper and lower layers of the material, and maintaining a temperature distribution difference of ≤2°C, thus avoiding uneven fermentation. The equipment also accelerates the contact between materials and air, regulates temperature and humidity, and shortens the fermentation cycle to 20-30 days, nearly half the time of traditional equipment.

Furthermore, the equipment boasts a high degree of automation, with an electronic control system and touchscreen operation, allowing one or two people to operate it, reducing labor input. For organic fertilizer companies seeking efficient production, the large wheel compost turner is undoubtedly an ideal choice for enhancing competitiveness.

The Secrets of the Double Roller Press Granulator in an Organic Fertilizer Production Line

fertilizer granulator Sep 11, 2025

In the granulation process of an organic fertilizer production line, the double roller press granulator, due to its high efficiency and environmentally friendly features, is a core piece of equipment. It uses the principle of physical extrusion to transform loose organic fertilizer raw materials into uniform granules, meeting the needs of fertilizer storage, transportation, and application. Its operation process can be divided into three stages: raw material pretreatment, extrusion molding, and granulation.

Raw material pretreatment is the foundation of granulation. Fermented and crushed organic fertilizer raw materials first enter the batching system, where they are mixed with auxiliary materials in a controlled ratio to achieve a moisture content of 20%-30% and a particle size uniformity of over 80%. The raw materials are then conveyed to the feed inlet of the double-roller extrusion granulator, where they are pushed at a constant speed between two counter-rotating extrusion rollers by a screw feeder. The feeder speed can be adjusted according to the raw material characteristics to ensure a stable feed rate and avoid overloading the equipment due to excessive raw materials or affecting granulation efficiency due to insufficient raw materials.

Extrusion molding is the core step. The surfaces of the two rollers of a double-roller extrusion granulator are equipped with evenly distributed depressions of the same shape. Common shapes include circular and oval. A motor drives the rollers in counter-rotating motion through a reduction gear, generating a strong extrusion force between the rollers, compressing the raw material into the depressions. Under this pressure, the organic particles in the raw material are tightly bound together, forming lumps that conform to the shape of the depressions. This process requires no binder, relying entirely on the raw material’s inherent viscosity and extrusion force to form the product. This reduces costs while ensuring the natural properties of the organic fertilizer. The extrusion force can be adjusted to the desired granule hardness, typically within a range of 15-30 MPa.

The final stage is granulation. After the lumps fall through the gap between the rollers, they enter the crushing and screening system. The crusher breaks down the lumps, and the screen separates the organic fertilizer granules into acceptable particle sizes (generally 2-8 mm). Unacceptable large lumps or fines are returned to the raw material system for recycling, increasing raw material utilization to over 95%.

The double roller press granulator plays a key role in the organic fertilizer production line with its advantages of continuous operation, low energy consumption and high particle strength, and provides equipment support for promoting the development of green agriculture.