Requirements for raw materials in double roller press granulator: How to choose suitable materials?

fertilizer granulator Aug 26, 2025

Double roller press granulators are efficient and energy-saving equipment widely used in producing granular fertilizers like organic fertilizer, compound fertilizer, and bio-fertilizer. However, not all raw materials are directly suitable for extrusion granulation. The physical and chemical properties of the material directly affect the granulation results.

Physical Property Requirements

1.Appropriate Particle Size

Raw materials must be crushed, generally to 80-200 mesh (0.074-0.2mm). Particles that are too coarse make forming difficult, while particles too fine can affect flowability and cause the material to stick to the rollers.

2.Moderate Moisture Content

Excessive moisture (>15%) causes material to stick to the rollers and affects demolding. Insufficient moisture (<8%) makes forming difficult, and the granules become brittle. The optimal moisture range is usually 8%-12%, though this may vary based on material characteristics.

3.Good Plasticity

Materials need some stickiness and plasticity (like humic acid, composted manure, bentonite) to help improve granule formation rate and hardness.

Chemical Property Requirements

1.Moderate Organic Matter Content

For organic fertilizer materials (like compost, humic acid), an organic matter content of 30%-70% is recommended. Too high can lead to loose granules; too low affects fertilizer efficiency.

2.No Corrosive Components

Strong acids, strong alkalis, or high-salt substances should be avoided in the raw materials to prevent equipment corrosion or harm to crops.

3.No Hard Impurities

Hard objects like stones or metal fragments can damage the double roller press granulator die. Screening or magnetic separation is needed before granulation.

Double roller press granulators have strict requirements for raw material particle size, moisture, and binding properties. Selecting suitable materials and optimizing process parameters are essential for producing high-strength, qualified granular fertilizer.

The Bio-Organic Fertilizer Revolution

fertilizer granulator Aug 25, 2025

Raw Material Pretreatment: Where Transformation Begins

On the bio organic fertilizer production line, everything starts with the remarkable transformation of organic waste. Livestock manure, crop straw, and food processing byproducts – these “misplaced resources” – are finely processed by grinders into uniform particles suitable for fermentation. These materials are then scientifically mixed with water and fermentation agents, like concocting a magical “activation potion” to create the perfect microbial environment for subsequent processes.

Fermentation Process: A Microbial Feast

The pretreated materials enter fermentation equipment (fermentation tanks or silos), initiating a microbe-led “celebration”. In the organic fertilizer line, this stage is truly the soul of the operation. Through regular turning and precise control of temperature, humidity, and oxygen levels, organic matter is efficiently decomposed at high temperatures, harmful pathogens are eliminated, and the materials ultimately transform into nutrient-rich organic fertilizer substrates.

Precision Processing: Crafting Perfect Pellets

After fermentation, the materials undergo drying to remove excess moisture before entering the crucial stage of bio organic fertilizer production – granulation. Various types of granulators shape the loose materials into uniform pellets, both aesthetically pleasing and convenient for transportation. The screening machines act as strict quality inspectors, ensuring every fertilizer pellet meets standards, with oversized or undersized particles being “recycled”.

Quality Enhancement: From Adequate to Excellent

In the final stage of a modern bio organic fertilizer production line, qualified pellets are uniformly mixed with additives like microbial agents and trace elements, as if donning “nutrient armor” for the fertilizer. Automatic packaging machines dress these “black gold” particles in neat packaging, while rigorous quality testing ensures every bag meets national standards, providing reliable support for green agriculture.

The environmental advantages of double roller press granulators in fertilizer production

fertilizer granulator Aug 25, 2025

As environmental awareness grows and sustainable agriculture advances, the double roller press granulator, as an advanced fertilizer granulation equipment, stands out as a top choice for modern fertilizer production thanks to its unique process and eco-friendly features.

1.Eliminates Drying, Low Energy Use
This double roller press granulator uses a dry molding process. It presses powdered materials into granules directly under mechanical pressure, skipping extra drying steps. This slashes energy use, cuts carbon footprint, and aligns with low-carbon production standards.
2.Zero Wastewater or Gas Emissions
The entire process requires no added binders or water, avoiding chemical pollution and wastewater. Production stays clean and eco-friendly, meeting environmental regulations.
3.High Material Utilization
The machine presses powdered fertilizers and organic waste directly into granules, with almost no waste. Even slightly flawed granules can be crushed and reused, enabling efficient resource recycling.

4.Ideal for Organic Fertilizer Production
The granulator works especially well for organic fertilizers. It turns agricultural waste like livestock manure and crop stalks into high-quality organic granules, reducing pollution from waste buildup while improving soil structure.
5.Low Noise, Low Dust
It runs smoothly with minimal noise. Its enclosed design effectively contains dust, protecting workers’ health and meeting modern factory safety and environmental standards.

With these strengths, the double roller press granulator has become key to the fertilizer industry’s green shift. Adopting this technology not only cuts production costs but also supports sustainable agriculture.

Scientific Maintenance of Organic Fertilizer Production Equipment

fertilizer granulator Aug 25, 2025

The stable operation of organic fertilizer production equipment is key to ensuring fertilizer quality and production efficiency. A scientific maintenance system can effectively extend equipment life and reduce the risk of failure. Targeted maintenance measures are required for equipment throughout the entire process, from pretreatment to finished product packaging, tailored to its characteristics.

Maintenance of pretreatment equipment focuses on preventing blockage and wear. As the first step in processing raw materials such as straw and manure, the crusher requires daily inspection for blade wear and weekly sharpening to prevent blunting and reduced pulverization efficiency. Screening machines require regular cleaning of residual fiber debris and monthly inspection of screen tension to prevent vibration-induced loosening that reduces screening accuracy. For conveying equipment, special attention should be paid to the tightness of the conveyor belt and the lubrication of the rollers to prevent failures caused by frictional overheating.

Granulating equipment requires timely cleaning and maintenance. The disc granulator‘s disc should be cleaned of residual particles daily and coated weekly with an anti-stick coating to prevent material from clumping and sticking. Bearings should be lubricated with high-temperature resistant grease monthly to ensure smooth rotation. The roller surface of the roller granulator should be regularly inspected for wear and any dents should be repaired promptly to avoid compromising pellet quality.

Maintenance of post-processing equipment focuses on precision and safety. The hot air ducts of the drum fertilizer dryer should be cleaned of dust monthly to prevent blockages that affect thermal efficiency. The temperature sensor should be calibrated weekly to ensure precise control of the drying temperature. The fan filter of the cooler should be cleaned regularly to prevent debris from entering and affecting heat dissipation. The metering device of the packaging machine should be calibrated weekly, and the drive chain of the conveyor belt should be lubricated monthly to ensure accurate quantitative packaging.

Establishing an equipment maintenance mechanism provides long-term protection. Recording the time, content, and troubleshooting of each maintenance session can help identify recurring problems promptly. Operators should also receive professional training to ensure early resolution of minor faults and early prevention of major problems. Scientific maintenance not only reduces equipment failure rates but also ensures the continuity and stability of the organic fertilizer production line, providing reliable support for the green development of agriculture.

The Important Role of Bio-Organic Fertilizer Production Lines in Agricultural Production

fertilizer granulator Aug 25, 2025

In the process of agricultural modernization, bio-organic fertilizer production lines are playing a pivotal role and becoming a key force in promoting sustainable agricultural development.

From a resource utilization perspective, bio-organic fertilizer production lines are a magical link in “turning waste into treasure.” Agricultural waste, such as livestock and poultry manure, crop straw, and urban organic waste, is collected and transformed through bio-fermentation technology into bio-organic fertilizer rich in beneficial microorganisms and nutrients. This process not only reduces waste accumulation and pollution but also achieves a resource cycle, returning waste to the land to fertilize crops and reducing reliance on external resources.

They are also highly effective in improving soil quality. Long-term use of chemical fertilizers leads to soil compaction, acidification, and decreased fertility. The beneficial microorganisms in bio-organic fertilizers activate soil microbiota, promote the formation of aggregate structures, enhance water and fertilizer retention and air permeability, increase organic matter content, repair damaged soil, and create a favorable growing environment for crops.

From the perspective of improving the quality of agricultural products, they contribute significantly. Bio-organic fertilizers release nutrients slowly and over a long period of time, meeting the needs of crops throughout their growth period and avoiding the drawbacks of the “sudden supply and withdrawal” of chemical fertilizers. Growth hormones secreted by beneficial microorganisms can enhance crop resistance, reduce pests and diseases, and reduce pesticide use. Agricultural products grown with these microorganisms are higher in vitamins, minerals, and sugars, have a better taste, meet green standards, and are highly competitive in the market.

Bio-organic fertilizer production lines are a key support for sustainable agricultural development, contributing significantly to resource recycling, soil conservation, and improving agricultural product quality. Future investment in research and development should be increased to maximize their impact and promote green, efficient, and sustainable agriculture.

The entire process of organic fertilizer production in agriculture

fertilizer granulator Aug 25, 2025

Organic fertilizer production is an ecological cycle of “turning waste into treasure.” Organic fertilizer production lines transform agricultural waste into nutrients that nourish the soil, and the entire process is guided by a green and environmentally friendly philosophy.

The first step in production is the collection and mixing of raw materials. Common raw materials include plant residues such as crop straw, rice husks, and peanut shells, as well as livestock manure such as chicken, cow, and sheep manure. These raw materials must be strategically combined to achieve a carbon-to-nitrogen ratio of approximately 30:1, for example, a straw-to-manure ratio of approximately 3:1. A small amount of wood ash is added to adjust the pH and create a suitable environment for microbial activity.

Next, the fermentation and composting stage begins, the core of organic fertilizer production. The mixed raw materials are transferred to a fermentation silo where they are regularly stirred by a turning device to maintain a temperature of 55-65°C. This temperature not only kills pathogens, insect eggs, and weed seeds, but also stimulates microbial activity. After 20-30 days of composting, the raw materials will gradually darken and soften, emitting a faint earthy odor, indicating that the organic matter has been fully decomposed.

The composted material needs to be refined. First, it is crushed into a fine powder by a crusher to remove impurities and large particles. Then it enters the granulation stage, where a granulator is used to make the powder into granules with a diameter of 2-5 mm for easy storage and application. Finally, it is screened by a screening device to separate the qualified granules, and the unqualified crushed materials are returned for reprocessing.

The finished product also undergoes quality inspection, testing for organic matter content, pH, and heavy metal content to ensure compliance with national standards. Qualified organic fertilizer granules are uniform, have a moderate moisture content (approximately 20%), and slowly release trace elements such as nitrogen, phosphorus, potassium, and calcium and magnesium.

The entire production process utilizes agricultural waste as a resource, addressing environmental pollution while replenishing natural nutrients to the soil. This “take from the field, return to the field” model is the key to the sustainable development of organic agriculture.

How does a NPK fertilizer production line produce fertilizer

fertilizer granulator Aug 25, 2025

A NPK fertilizer production line is a modern production system that scientifically blends the three key elements, nitrogen, phosphorus, and potassium, to create compound fertilizer. From raw material processing to finished product packaging, each step embodies the principles of precision and standardization.

Raw material pretreatment is the foundation of production. Nitrogen fertilizer raw materials, primarily ammonia and urea, require crushing and screening to remove impurities. Phosphorus sources, typically monoammonium phosphate and superphosphate, are ground to a desired fineness. Potassium salts, primarily potassium chloride and potassium sulfate, are dried to reduce moisture. These three raw materials are metered according to crop requirements and precisely mixed using an intelligent batching system.

Mixed granulation is the core step. The pretreated raw materials enter the agitator for thorough homogenization before being fed into the rotary drum granulator. The inclined rotating drum drives the material, while a spray system adds an appropriate amount of water or steam, allowing the material to gradually agglomerate into granules through friction and adhesion. Particle size can be controlled by adjusting the drum speed and the material’s residence time, resulting in rounded granules. This process is highly adaptable and can handle a variety of raw material formulations. It also produces granules with high strength and good water solubility, making it suitable for large-scale continuous production. After granulation, the granules are screened and graded, and unqualified granules are returned for reprocessing to ensure consistent product size.

Post-processing determines fertilizer stability. The granules enter a dryer, where moisture is controlled within a reasonable range at an appropriate temperature to prevent clumping. After cooling, they are sprayed with an anti-caking agent in a film coating machine to form a protective film. Finally, they are packaged in standard bags by a quantitative packing machine for sale.

NPK fertilizer production line transforms chemical raw materials into “nutrient packs” that provide a balanced supply to crops. This not only addresses the nutrient imbalance of single fertilizers, but also improves fertilizer utilization through industrialized production, providing efficient and stable nutrient support for modern agriculture.

Granulation Revolution: How Far Have We Come?

fertilizer granulator Aug 25, 2025

From Crude Crushing to Precision Granulation: The Remarkable Evolution of Fertilizer Technology

Imagine what those uniform, smooth fertilizer pellets we see today would look like without modern granulation technology? Before the innovation of the fertilizer production machine, early fertilizer production resembled Stone Age craftsmanship—crude, irregular, and inefficient. The absence of specialized equipment, particularly the organic fertilizer production machine, meant farmers constantly battled caking, dust, and uneven nutrient distribution—issues that directly impacted crop growth and yields.

The Revolutionary Breakthrough of Drum Granulators

When the first rotary drum granulator rumbled into production, it sent shockwaves through the industry. This “revolving steel giant”, with its ingeniously tilted design and internal structure, achieved uniform fertilizer pellet formation. Materials continuously tumble and agglomerate inside the drum, much like waves polishing pebbles naturally. Compared to traditional extrusion or crushing methods, the drum process not only increased output but also enhanced pellet strength by over 40%.

The Intelligent Leap of Modern Granulation

Today’s granulation equipment has evolved to astonishing levels. Sensor networks monitor moisture, temperature, and particle size in real-time; adaptive control systems fine-tune parameters like seasoned artisans; innovative coating technologies enable more precise nutrient release. We’re no longer just producing fertilizer pellets—we’re creating “smart nutrient capsules” that know when to release nutrients and how to adapt to different soil conditions.

The Future: A Dual Symphony of Green and Precision

With growing sustainability awareness, next-generation granulation technology is advancing in two exciting directions: utilizing biodegradable materials to reduce environmental impact, and incorporating big data for truly precision agriculture. Perhaps in the near future, our granulators won’t just produce fertilizer, but will customize special formulations for each field based on satellite data.

The Secrets of the Disc Granulator in an Organic Fertilizer Production Line

fertilizer granulator Aug 25, 2025

At the heart of an organic fertilizer production line, the disc granulator, with its unique operating principle, transforms loose organic raw materials into uniform granules, becoming a key piece of equipment connecting fermentation and finished products. While its seemingly simple operation requires precise control of material properties and mechanical movement, the disc granulator’s core structure consists of a tilted circular disc, the angle of which can be adjusted according to the characteristics of the raw materials. When fermented and pulverized organic materials (such as a mixture of livestock and poultry manure and straw) are fed into the disc, the disc rotates at a constant speed, causing the materials to slide upward along the disc wall under the combined effects of centrifugal force, friction, and gravity. Once they reach a certain height, they fall due to gravity, forming a continuous material circulation.

The key to the granulation process lies in the proper ratio of water to material. As the disc rotates, a spray system evenly applies an appropriate amount of water to the material, forming a moist film on the surface of the organic granules. As the materials collide and squeeze each other during this circulation, the moistened surfaces of the granules attract surrounding fine particles, gradually expanding like a snowball. The operator monitors the granulation process and adjusts the water spray rate and disc speed in real time to ensure uniform particle size.

The disc granulator‘s advantage lies in its adaptability to organic materials. Organic fertilizer raw materials are complex and high in fiber. The gentle rotation of the disc reduces material loss while preserving the activity of beneficial microorganisms. For materials with high humidity, the disc’s tilt angle can be adjusted to reduce the material’s residence time within the disc, preventing sticking and clumping. For dry materials, the disc’s rotation speed can be slowed to prolong agglomeration.

Organic fertilizer granules processed by the disc granulator are not only easy to store and transport, but also enable a slow release of nutrients upon application. With its simple and efficient design, this equipment bridges the gap between raw materials and finished product in the industrial production of organic fertilizer, providing solid technical support for the large-scale development of organic agriculture.

How to Choose the Right Double Roller Press Granulator for Farms

fertilizer granulator Aug 22, 2025

Due to its unique advantages, double-roller press granulators have become essential equipment for farms to process manure and produce organic fertilizer. When selecting a granulator, you need to consider multiple factors to ensure it meets your production needs.

First, you need to determine your production scale. Small and medium-sized farms have limited daily manure processing capacity, so choosing a small machine with an hourly capacity of 1-3 tons can meet daily granulation needs while avoiding idle equipment. Large-scale farms require a machine with an hourly capacity of 5 tons or more and strong continuous operation capabilities to ensure timely manure processing and stable fertilizer output.

Second, consider the characteristics of the raw materials. Farms primarily use livestock and poultry manure as their raw material, which is high in moisture and contains impurities such as crude fiber. Therefore, the equipment needs to have strong anti-clogging capabilities, and the roller surface should be made of a non-slip and wear-resistant material to prevent slippage and affect granulation efficiency.

Supporting facilities should be planned simultaneously. It’s recommended to use pre-treatment equipment such as dewatering machines and crushers to control the moisture content of raw materials within an appropriate range, and to configure screening devices to grade finished particles to improve fertilizer quality. Furthermore, consider equipment energy consumption, prioritizing energy-efficient models to reduce operating costs.

A balance should be struck between price and after-sales service. Avoid blindly pursuing low-priced equipment, as its materials and workmanship may be defective and increase maintenance costs. Choose a manufacturer that can provide installation and commissioning, operator training, and rapid fault response to ensure stable operation after the equipment is commissioned and minimize losses caused by downtime.

A comprehensive assessment of production scale, raw material characteristics, equipment quality, supporting capabilities, and after-sales service is crucial to selecting a double-roller press granulator suitable for your farm, ensuring efficient resource utilization of manure.