double roller press granulator – fertilizer production line

How to produce 3 tons/hour of NPK compound fertilizer granules?

Written by fertilizer production line on February 26th, 2026.

Producing 3 tons/hour of NPK compound fertilizer granules hinges on achieving “equipment synergy, precise process control, and stable production capacity.” This requires a NPK fertilizer production line matched to this capacity, relying on mature NPK compound fertilizer granulation technology, and controlling parameters at each stage to efficiently produce qualified granules, balancing both yield and quality.

Step 1: Raw Material Pre-treatment and Precise Proportioning. Mix nitrogen, phosphorus, and potassium raw materials and fillers according to the target formula, crush them to 80-100 mesh, and remove impurities; precisely control the proportions through an automatic batching system to ensure uniform nutrient distribution. Then, the mixture is sent to a fertilizer mixer and stirred for 5-8 minutes until evenly mixed, laying the foundation for granulation.

Step 2: Core Granulation Process. Select a rotary drum granulator or double roller press granulator suitable for a 3 tons/hour capacity. Feed the mixed raw materials into the equipment, adjusting the moisture content to 18%-22% and the granulation speed to 20-30 r/min. Utilizing NPK compound fertilizer granulation technology, the raw materials are formed into uniform granules with a particle size of 2-4 mm, ensuring granulation efficiency and granule strength.

Step 3: Drying, Cooling, and Screening. After granulation, the granules are sent to a dryer, controlling the temperature at 80-100℃ to dry them to a moisture content of ≤12%; then cooled to room temperature by a cooler to prevent granule clumping; finally, they are graded by a screening machine, removing unqualified granules, which are returned to the mixer for re-granulation, achieving recycling.

Step 4: Finished Product Testing and Packaging. Test the nutrient content, strength, and other indicators of the granules. After meeting the standards, automatic packaging is performed. The entire production line needs to be coordinated to ensure smooth transitions between each stage, thus achieving a stable 3 tons/hour production capacity. The key is appropriate equipment selection and precise parameter control to efficiently produce high-quality NPK compound fertilizer granules.

Analysis of the core purpose of dry granulation in fertilizer processing

Written by fertilizer production line on February 12th, 2026.

In fertilizer processing, dry granulation technology is a mainstream process, primarily utilizing double roller press granulators. Its purpose is not simply to change the form of the fertilizer, but rather to focus on three core aspects: preserving fertilizer efficacy, facilitating storage and transportation, and adapting to production needs. By considering the characteristics of the raw materials, this technology aims to improve both fertilizer quality and processing efficiency, making it suitable for large-scale production.

Preserving fertilizer efficacy and preventing nutrient loss is the primary objective. Fertilizer dry granulation technology does not require large amounts of water or high-temperature drying. It relies on the mechanical extrusion of the double roller press granulator for direct molding, avoiding the decomposition and volatilization of heat-sensitive and easily decomposable raw materials due to high temperatures. This reduces nutrient loss caused by moisture, ensuring accurate nutrient content.

Optimizing form and improving convenience in storage, transportation, and application is a core practical objective. Powdered fertilizers are prone to moisture absorption, caking, and dust dispersion, making application inconvenient. Fertilizer dry granulation technology processes them into uniform, compact granules with good fluidity, facilitating storage, transportation, and precise mechanical application, preventing seedling burn and saving labor while improving efficiency.

Adapting to diverse needs and reducing costs is an important objective. This technology has low energy consumption and does not require complex drying processes. The double roller press granulator can accommodate various raw materials and formulations without requiring large amounts of binders, reducing waste and costs. It also adapts to continuous operation in large-scale fertilizer production lines, improving processing efficiency.

In summary, the core of dry granulation technology in fertilizer processing is to optimize practicality and adapt to production while preserving fertilizer efficacy, balancing quality, efficiency, and cost, laying a solid foundation for subsequent stages of fertilizer processing.

Classification and analysis of compaction technologies: Applicable types in different scenarios

Written by fertilizer production line on February 9th, 2026.

Compaction is a process that uses external force to expel voids in materials and increase density, and it is widely used in many fields. Based on the pressure principle and working method, the mainstream compaction types are divided into four categories, suitable for different materials and scenarios.

Static compaction is the basic type, relying on mechanical weight or hydraulic devices to apply continuous static pressure, causing material particles to rearrange and voids to shrink. The process is stable and impact-free, suitable for fine-grained materials, resulting in uniform compaction, but with limited effect on coarse-grained materials. In organic fertilizer production, double roller press granulators are typical static compaction equipment widely used in organic fertilizer production lines.

Impact compaction relies on instantaneous impact force to break through the material structure. High-intensity impact force is generated through the falling of heavy hammers or the rolling of impact wheels, achieving deep compaction. It is suitable for scenarios such as roadbed backfilling and landfill sites, improving deep-layer density, but the force needs to be controlled to avoid surface damage.

Vibratory compaction combines vibration and pressure. High-frequency vibration of the equipment suspends material particles, and pressure is applied to quickly fill the voids. Its efficiency far exceeds that of static compaction, and it is suitable for coarse-grained materials, offering both high efficiency and uniformity. As a commonly used organic fertilizer production equipment, it can be integrated into organic fertilizer production lines to compact coarse-grained raw materials or semi-finished products.

Composite compaction integrates multiple principles and can switch working modes, balancing surface uniformity and deep-layer density. It is suitable for complex materials and high-standard scenarios, and can adapt to raw materials with different moisture content and particle sizes, enabling precise pressure control and helping to improve the quality of organic fertilizer products.

Granular potassium fertilizer: A comprehensive guide to benefits, production, and application

Written by fertilizer production line on February 5th, 2026.

Granular potassium fertilizer is a commonly used, high-quality form of potassium fertilizer in agricultural production. It offers the advantages of convenient storage and transportation, and stable fertilizer efficiency. Its production relies on specialized equipment, and its application requires careful consideration of crop needs, balancing increased efficiency with soil health.

The core benefits focus on practical application and effectiveness. Compared to powdered potassium fertilizer, granular potassium fertilizer is less prone to caking and dust, making storage and handling more convenient and reducing nutrient waste; its uniform particle size is suitable for mechanized application, ensuring even distribution and preventing seedling burn, saving labor and increasing efficiency; and its slow-release properties provide a sustained supply of potassium, improving absorption and utilization.

The production process emphasizes standardization and adaptability. Granular potassium fertilizer is often produced using NPK fertilizer production lines, employing granulation machines such as double roller press granulators and rotary drum granulators. This process requires minimal binders and high-temperature drying, and is compatible with raw materials such as potassium chloride and potassium sulfate, allowing for precise control of particle strength and size.

Application must follow scientific principles. It is suitable for field crops such as corn and rice, as well as economic crops such as tomatoes and fruit trees, with a focus on application during critical potassium-demanding stages such as stem elongation and fruit development; it can be applied through furrow application or broadcasting, and combined with organic fertilizers to enhance effectiveness; and the application rate should be controlled based on soil fertility to avoid excessive application and nutrient antagonism.

In summary, the value of granular potassium fertilizer lies in its standardized production and scientific application. It leverages its physical form to improve practicality and contributes to efficient and sustainable agricultural production through precise nutrient supply.

Guidelines for large-scale production of bio-organic fertilizer: Key to high-efficiency mass production

Written by fertilizer production line on February 5th, 2026.

The core of large-scale bio-organic fertilizer production is achieving “resource utilization of raw materials, standardized processes, mechanized equipment, and controllable quality.” This requires relying on complete sets of equipment and scientific processes, balancing mass production efficiency and fertilizer activity. The core processes and key points are as follows:

Step 1: Raw Material Pre-treatment and Proportioning: Collect livestock and poultry manure, crop straw, and other raw materials in batches. After crushing and screening to remove impurities, the materials are precisely mixed using a double axis paddle mixer according to a carbon-nitrogen ratio of 25-30:1 and a moisture content of 55%-60%, laying a solid foundation for microbial fermentation.

Step 2: Microbial Activation and High-Temperature Fermentation: Select high-efficiency microbial strains such as Bacillus subtilis, activate and expand them, and then mix them into the raw materials. Regular turning is performed using a compost turning machine, controlling the temperature at 55-65℃ and the pH value at 6.5-7.5. Fermentation takes 7-15 days to ensure thorough decomposition, kill pathogens, and preserve microbial activity. This is the core of the production process.

Step 3: Post-treatment and Granulation: The fermented material is dried at low temperature (moisture content ≤20%), crushed, and screened. Granulation is then performed using a double roller press granulator, balancing efficiency and microbial activity while avoiding high-temperature damage.

Step 4: Testing and Storage: The finished product is tested for indicators such as organic matter and effective viable bacteria count. After meeting the standards, it is packaged and stored. Storage requires ventilation, dryness, and protection from light and moisture. The entire process relies on a complete set of bio-organic fertilizer equipment to achieve continuous mass production.

In summary, the key to large-scale production is precise raw material proportioning, controllable fermentation, and coordinated equipment, ensuring both mass production and fertilizer quality, contributing to green and circular development in agriculture.

A comprehensive analysis of common compound fertilizer production processes

Written by fertilizer production line on February 4th, 2026.

Compound fertilizer production processes are diverse, with core differences focusing on raw material processing, granulation methods, and energy consumption control. Different processes are suited to different fertilizer types and production capacity requirements. The following outlines the core characteristics and application scenarios of four major processes, providing a reference for production selection.

Rotary drum granulation is a traditional mainstream wet process. Raw materials are sprayed, mixed, and granulated in a rotary drum, followed by drying, cooling, and screening to complete production. Its advantages include high production capacity and uniform granules, making it suitable for general-purpose NPK compound fertilizers; its disadvantages include high energy consumption and strict control over raw material moisture content.

Spray granulation emphasizes high efficiency and integration. The raw material slurry is directly sprayed into a granulation tower, where it is rapidly dried and formed by hot air, without the need for additional mixing. It offers uniform nutrient distribution and high efficiency, making it suitable for large-scale production of high-concentration compound fertilizers, but it requires high equipment investment and has stringent requirements for slurry viscosity.

Dry extrusion granulation is an environmentally friendly and energy-saving process. Dry raw materials are directly pressed into shape using a double roller press granulator, eliminating the need for water addition and drying. Energy consumption is more than 30% lower than wet processes, and there is no wastewater or exhaust gas. It is suitable for various raw materials and small-to-medium-scale environmentally friendly production, although the granule strength is slightly lower.

Blending granulation focuses on flexibility. Single fertilizers are mixed according to the formula using a double axis paddle mixer, and then granulated or made into BB fertilizer as needed. It offers flexible formulations and convenient product changes, making it suitable for customized production, but it requires high consistency in raw material particle size.

NPK and specialty compound fertilizer dry granulation: Process differences and practical considerations

Written by fertilizer production line on February 3rd, 2026.

Dry granulation is an environmentally friendly and efficient production process for compound fertilizers. It requires no high-temperature drying or additional water, relying on mechanical pressure for shaping. It is suitable for the production of both general-purpose and specialty compound fertilizers on NPK fertilizer production lines. The core aspects are formula adaptation and process parameter control.

Dry granulation of NPK compound fertilizers focuses on nutrient uniformity and granule strength. Nitrogen, phosphorus, and potassium raw materials are crushed and screened, then mixed according to the formula ratio, and fed into a double roller press granulator to be pressed into sheets. These sheets are then crushed and screened to obtain uniform granules. Strict control of raw material fineness and mixing is necessary to avoid nutrient segregation. This process is suitable for general-purpose field fertilizers, resulting in high granule strength and resistance to caking, meeting the needs of large-scale production lines.

Dry granulation of specialty compound fertilizers requires adaptation to customized formulas, often including the addition of trace elements and microbial agents. During granulation, pressure parameters need to be optimized to avoid damaging heat-sensitive components. Extrusion or roller press granulation equipment is used, and granule size is adjusted to suit precision farming, ensuring that special nutrients are not lost and that fertilizer efficacy is precisely released.

For both types of granulation and production line operation, two key points must be controlled: raw material moisture content should be controlled at 5%-8% to avoid adhesion or difficulties in molding; and equipment should be regularly inspected to ensure uniform granules. Dry granulation has low energy consumption and produces no wastewater, meeting the environmental requirements of the production line.

In summary, the core of dry granulation for both types of fertilizers is formula adaptation to the process. NPK compound fertilizers are adapted for large-scale production lines, while specialty fertilizers prioritize the protection of special nutrients.

Double roller press granulator: The preferred solution for dry granulation of potassium sulfate

Written by fertilizer production line on February 3rd, 2026.

Potassium sulfate (SOP) is a high-quality, chlorine-free potassium fertilizer widely applicable to chlorine-sensitive crops such as tobacco and fruits and vegetables. However, its hygroscopic and highly crystalline properties place extremely high demands on the granulation process. Double roller press dry granulation technology, with its advantages of no drying, low energy consumption, and high purity retention, has become an ideal solution for potassium sulfate granulation.

Potassium sulfate raw materials need to be screened by a fertilizer screener machine to remove impurities and dried at low temperature, controlling the moisture content to 2%-5% to prevent sticking to the roller surface during granulation. The double roller press granulator, by adjusting the 8-15MPa pressure and speed of the rollers, directly extrudes the dry powder into granules, requiring minimal binders, maximizing the preservation of SOP purity, and avoiding the moisture absorption and alkali return problems associated with wet granulation.

This process eliminates the need for high-temperature drying, reducing energy consumption by over 40%, and produces no wastewater or exhaust gas emissions, meeting environmental protection requirements. The granulated particles have a compressive strength ≥15N, uniform strength, and are not easily pulverized, making them suitable for mechanized fertilization and long-distance transportation, while also allowing for controllable dissolution rates.

The equipment can process potassium sulfate granules independently or be used in conjunction with a double axis paddle mixer to add micronutrients to create compound potassium sulfate fertilizer, flexibly adapting to different formulations. It is simple to operate and easy to change production lines, meeting the needs of large-scale production by large enterprises as well as batch processing by small and medium-sized workshops.

In summary, the double roller press granulator is precisely adapted to the characteristics of potassium sulfate, empowering the industrialization of potassium sulfate fertilizer and helping chlorine-sensitive crops to accurately supplement potassium, improve quality, and increase yield.

High-potassium fertilizer: Unlocking the key nutrient for high crop yields

Written by fertilizer production line on February 2nd, 2026.

Potassium is an essential macronutrient for crops. High-potassium fertilizer, as an important category of NPK fertilizers, is processed and shaped using NPK fertilizer production lines equipped with rotary drum granulators and other equipment. It not only precisely supplements nutrients but also strengthens the foundation for high yields by regulating crop physiological metabolism and enhancing stress resistance. It is suitable for crops with high potassium requirements, ensuring both increased yield and improved quality.

High-potassium fertilizer contributes to high yields through multiple mechanisms. Firstly, it enhances stress resistance, regulating cell osmotic pressure to improve drought and cold resistance, and strengthening stem toughness to prevent lodging; secondly, it promotes nutrient transport, acting as an enzyme activator to accelerate the transport of photosynthetic products to harvest organs, increasing fruit setting rate; thirdly, it improves fruit development, reducing flower and fruit drop and malformed fruits, and increasing the rate of marketable fruits.

Different crops have varying potassium requirements, making targeted application more efficient. Economic crops such as tomatoes and cucumbers require a significant increase in potassium during the fruit expansion stage; high-potassium fertilizer can promote fruit expansion and increase sugar content. For field crops such as corn and rice, application during the jointing and grain filling stages enhances lodging resistance and increases thousand-grain weight. For fruit trees, application during the fruit expansion stage reduces fruit cracking and extends shelf life.

Scientific application and high-quality production are indispensable. The production line can precisely control the proportion of high-potassium fertilizer, and the double roller press granulator is suitable for cold pressing and molding requirements, ensuring granule quality. During application, it is necessary to control the amount to prevent nutrient antagonism, apply in stages during key periods, and combine with organic fertilizers to improve the conversion efficiency of potassium elements, achieving synergistic effects.

In summary, producing high-potassium fertilizer using professional equipment and applying it scientifically based on crop characteristics and soil conditions can achieve both increased yield and improved quality.

On-demand fertilizer production: Simple methods for making organic fertilizers of different shapes

Written by fertilizer production line on January 30th, 2026.

Organic fertilizers commonly come in powder, granular, and pellet forms. The core difference in their production lies in the molding process and equipment adaptation. The choice can be made flexibly based on planting needs, balancing efficiency and fertilizer effectiveness.

Powdered organic fertilizer: The simplest to produce, suitable for broadcasting. Composted materials (chicken manure, straw, etc.) are crushed and screened to remove impurities, requiring no molding step. Large-scale production can utilize mixing equipment in an organic fertilizer production line to adjust nutrients and then directly package the product. It is suitable for base fertilization in large fields and greenhouses, offering quick results and low cost.

Granular organic fertilizer: Suitable for mechanized application and convenient for storage and transportation. After crushing and screening the composted material, the moisture content is adjusted to 55%-60%, and then fed into a double roller press granulator for molding. After drying, cooling, and secondary screening, it is packaged. Small-scale composting can use small granulation equipment, while large-scale production can be integrated into an organic fertilizer production line. It is suitable for top dressing of fruit trees and vegetables, as it is less prone to caking and allows for even application.

Pellet organic fertilizer: Suitable for hole application and furrow application. A flat die pelleting machine is used to extrude the pre-treated composted material (a small amount of binder can be added) into pellets, which are then cut, dried, and cooled. It has high density and long-lasting fertilizer effect, suitable for hole application in fruit trees and seedlings, reducing nutrient loss.

In summary, the core of producing different shapes of organic fertilizers is “standardized composting + appropriate molding.” Powdered fertilizer focuses on crushing and screening, while granular and pellet fertilizers rely on granulation equipment. Choosing the appropriate form based on needs can improve application convenience and maximize fertilizer effectiveness.

fertilizer production line

fertilizer granulator

Posts with the double roller press granulator tag