Screening in an Organic Fertilizer Production Line

fertilizer granulator Sep 15, 2025

In the entire organic fertilizer production process, the screening process acts as a sophisticated “quality filter,” directly determining the particle uniformity and impurity content of the final product. It is the core link between fermentation and finished product packaging. Neglecting meticulous control of the screening process can lead to reduced product quality due to residual impurities or uneven particle size, even with the most advanced fermentation processes, impacting market competitiveness.

Currently, mainstream organic fertilizer production lines mostly utilize a combination of “vibration screening + drum screening.” The vibrating screener machine‘s high-frequency vibrations quickly separate large impurities (such as uncomposted straw and gravel) from the material. The screen’s aperture can be flexibly adjusted to product requirements, typically selecting a 10-20 mesh size to meet common organic fertilizer standards. The drum screener machine, on the other hand, uses a slowly rotating cylindrical screen drum to perform a secondary classification of fine particles, effectively removing powdery materials and ensuring a final particle size deviation within ±2mm. The synergistic operation of these two devices can increase material screening efficiency to over 95%, significantly reducing the risk of blockage in the subsequent packaging process.

Operational control during the screening process is equally critical. Screen wear must be regularly inspected, and if mesh deformation exceeds 5%, it must be replaced promptly to avoid missed screens. Furthermore, equipment parameters must be dynamically adjusted based on the moisture content of the material. If the moisture content of the fermented material exceeds 30%, the vibration frequency or drum speed must be appropriately reduced to prevent the material from sticking to the screen and affecting screening efficiency. By establishing a management system that includes “two-hourly screen inspections and real-time moisture content monitoring,” one organic fertilizer manufacturer increased its product qualification rate from 88% to 99.2%, reducing annual reject losses by over 120 tons.

As the organic fertilizer industry’s demand for product quality increases, screening technology is evolving towards intelligent technology. Some advanced production lines have incorporated IoT monitoring systems, using sensors to collect real-time data such as screening output and impurity separation rate, enabling unmanned, precise screening. This technological innovation not only reduces labor costs but also further ensures the stability of screening accuracy, laying a solid foundation for organic fertilizer products to enter the high-end market.

The Technology and Value of the Granulation Process in Organic Fertilizer Production Lines

fertilizer granulator Sep 11, 2025

In organic fertilizer production lines, the granulation stage is the core link between raw material processing and finished product packaging, directly determining the physical properties, ease of application, and market competitiveness of organic fertilizers.

The core task of the granulation stage is to transform crushed organic fertilizer raw materials (such as composted livestock and poultry manure and straw powder) into granules of uniform particle size and moderate hardness through physical or chemical reactions. This process requires addressing two key issues: first, preventing loose raw materials from flying and agglomerating, which can lead to transportation and storage losses; second, controlling the nutrient release rate through granule morphology to improve fertilizer utilization in the soil. Currently, mainstream granulation equipment includes disc granulators, rotary drum granulators, and double roller press granulators. Disc granulators are the preferred choice for small and medium-sized production lines due to their high granulation rate (over 90%) and excellent granule roundness. Rotary drum granulators are suitable for large-scale continuous production, with a single unit capable of producing over 50 tons per day.

Three key factors influence granulation performance: First, the moisture content of the raw materials, which must be controlled between 25% and 35%. A moisture content too high can easily cause pellets to stick together, while a moisture content too low can make them difficult to form. Second, the raw material ratio. By adding small amounts of auxiliary materials such as bentonite and straw powder, the cohesiveness and porosity of the raw materials can be adjusted. Third, equipment parameters, such as the disc pelletizer’s inclination angle (typically 45°-55°) and rotation speed (15-20 rpm), must be dynamically adjusted based on the raw material’s characteristics. For example, in the production of organic fertilizer from chicken manure, if the crude fiber content of the raw material is too high, the disc speed must be increased appropriately, and 1%-2% bentonite must be added to ensure that the pellet hardness meets the industry standard of a compressive strength of ≥2N.

With the increasing demand for green agriculture, the granulation process is also evolving towards intelligent and low-carbon processes. Some advanced production lines have implemented online moisture monitoring systems, allowing real-time adjustment of spray volume to control raw material moisture. Furthermore, by optimizing the granulator’s heating method, replacing traditional electric heating with waste heat recovery, energy consumption per ton of product has been reduced by over 15%. Technological innovation in the granulation process is driving the transformation of organic fertilizer from a “heavy-duty” product to a “refined agricultural input,” injecting critical momentum into the green development of agriculture.

Structural Design and Analysis of a Rotary Drum Granulator

fertilizer granulator Sep 5, 2025

As the core granulation equipment in an organic fertilizer production line, the structural design of a rotary drum granulator directly impacts granulation efficiency and product quality. Its overall design is centered around “efficient granulation, stable conveying, and adaptability to the characteristics of organic fertilizers.”

The rotary drum granulator‘s core working component is an inclined rotating drum, welded from steel plates. The inner wall is lined with a wear-resistant lining to prevent abrasion by humic acid and other components in the organic fertilizer raw materials, while also enhancing material friction to aid granulation. The drive system offers both constant and variable speed options.

The constant speed option is suitable for large-scale production with stable raw materials, while the variable speed option (8-15 rpm) can be adjusted to suit different raw materials: reducing the speed to prevent sticking when the liquid content is high, while increasing the speed to promote compact granules when the liquid content is low.The rotary drum granulator drum inclination angle is a critical parameter, typically 3-10 degrees. A too small angle causes the material to remain in the drum for too long, leading to agglomeration or oversized granules. A too large angle results in rapid material flow, insufficient granulation time, and loose granules. A 50-100mm high retaining ring is installed at the feed end to prevent loose powder from flowing back. The height of the retaining ring at the discharge end is adjustable. It can be raised to extend retention time when larger pellets are needed, and lowered or replaced with a spiral discharge ring for faster discharge. The blade angle matches the rotational speed, ensuring a uniform feed to the screen and preventing clogging.

The integrated cylindrical screen is key to finished product screening. Its aperture is customized to meet organic fertilizer requirements (2-5mm). Rotating synchronously with the drum, qualified pellets are discharged while unqualified, large particles are returned for reprocessing, achieving an integrated “granulation-screening” process. The flexible binder injection system allows for pre-injection, suitable for highly absorbent raw materials such as straw. Instantaneous injection allows for precise moisture control to prevent over-wetting. Both methods are equipped with metering pumps to ensure precise dosage (10%-15% of the total raw material) and guarantee pellet formation efficiency.

What is the role of organic fertilizer production line equipment?

fertilizer granulator Sep 5, 2025

Organic fertilizer production line equipment promotes agricultural production. Organic fertilizer is of great significance to protecting a healthy ecological environment and human health. Organic fertilizer production lines have abundant raw material resources, a wide variety, and a vast quantity. Commercial organic fertilizer processed by organic fertilizer equipment is an important source of fertilizer for agricultural production. Wherever there is agriculture and animal husbandry, there is a source of organic fertilizer and a need for organic fertilizer equipment. Urban organic household waste can also serve as a fertilizer source for organic fertilizer production lines.

The more developed agriculture and animal husbandry, the more abundant the organic fertilizer resources. Not only in China, but also in countries such as the United States, Germany, Africa, and Australia, there is an increasing emphasis on organic fertilizer. Therefore, organic fertilizer production lines and processing equipment are particularly important. Green manure, human waste, feces, biogas, and waste manure are all raw materials for organic fertilizer production. Organic fertilizers are mainly divided into feces, urine, compost, cake fertilizer, peat, soil, municipal waste, and miscellaneous manure. In addition to providing organic carbon nutrients such as nitrogen, phosphorus, and potassium, organic fertilizers also provide a considerable amount of medium and trace elements, as well as organic nutrients such as amino acids, nucleic acids, sugars, and vitamins. Because organic fertilizers contain a relatively complete range of nutrients and are completely non-toxic, harmless, and pollution-free natural substances, they provide the necessary conditions for producing high-yield, high-quality, and pollution-free green food.

Organic fertilizers produced by organic fertilizer production lines are an important way to achieve high and stable crop yields. The yields of grain crops such as wheat and corn increase with increased fertilizer application, highlighting the advantages of organic fertilizers and their irreplaceable nature. Compared to chemical fertilizers, people are choosing organic fertilizers accordingly. Professional organic fertilizer production line equipment can reduce fertilizer production costs, effectively lower agricultural production costs, and minimize environmental pollution. Organic fertilizer production line equipment meets the requirements of sustainable development in modern agriculture.

Analysis of the Complete Fertilizer Production Process on an Organic Fertilizer Production Line

fertilizer granulator Sep 2, 2025

Organic fertilizer production lines use scientific processes to transform agricultural and livestock waste into high-quality fertilizer, achieving resource recycling. The entire production process revolves around four core steps: raw material processing – composting – forming – packaging, and each step directly impacts fertilizer quality.

The first step is raw material pretreatment. The production line collects raw materials such as livestock manure, straw, and mushroom residue, and uses screening equipment to remove impurities such as stones and plastic to prevent them from affecting subsequent processes. Next, a crusher is used to pulverize the straw and other coarse fiber materials to a particle size of 5-10mm. The material is then mixed with livestock manure in a ratio of approximately 3:7. A small amount of fermentation inoculant is added, adjusting the carbon-nitrogen ratio to 25:1-30:1 and controlling the moisture content to 50%-60%, laying the foundation for fermentation and composting.

The second step is fermentation and composting. The mixed raw materials are transported to the fermentation workshop and stacked in windrow or tank-type fermentation equipment. During the fermentation process, a compost turning machine regularly turns the material to ensure adequate oxygen and regulate the temperature. The entire fermentation cycle lasts approximately 20-30 days. After composting, the material transforms into a dark brown, odorless humus. It then passes through a cooling device to a temperature below 30°C to prevent nutrient loss during subsequent processing.

The third step is further processing and shaping. The cooled composted material is first crushed to a particle size of 2-3mm in a fine grinder. It is then mixed with a small amount of auxiliary materials such as bentonite and humic acid in a mixer to enhance the fertilizer’s stability. The material then enters the granulation stage, where a rotary drum or disc granulator physically agglomerates the material into 2-5mm granules. The granules are then dried (controlled at 60-80°C) to reduce moisture to below 15%, cooled in a cooler, and screened to separate unqualified particles. The fine powder is then returned to the granulator for reuse.

The finished product is then packaged. Qualified pellets are transported to the packaging workshop, where an automatic packaging machine weighs and seals them into 25kg or 50kg packages, producing finished organic fertilizer.

In short, the organic fertilizer production line, through standardized and mechanized full-process control, efficiently transforms waste into high-quality fertilizer, contributing to environmental protection while providing green nutrients for agriculture.

Analysis of the Complete Fertilizer Production Process on an Organic Fertilizer Production Line

fertilizer granulator Aug 26, 2025

Organic fertilizer production lines use scientific processes to transform agricultural and livestock waste into high-quality fertilizer, achieving resource recycling. The entire production process revolves around four core steps: raw material processing – composting – forming – packaging, and each step directly impacts fertilizer quality.

The first step is raw material pretreatment. The production line collects raw materials such as livestock manure, straw, and mushroom residue, and uses screening equipment to remove impurities such as stones and plastic to prevent them from affecting subsequent processes. Next, a crusher is used to pulverize the straw and other coarse fiber materials to a particle size of 5-10mm. The material is then mixed with livestock manure in a ratio of approximately 3:7. A small amount of fermentation inoculant is added, adjusting the carbon-nitrogen ratio to 25:1-30:1 and controlling the moisture content to 50%-60%, laying the foundation for fermentation and composting.

The second step is fermentation and composting. The mixed raw materials are transported to the fermentation workshop and stacked in windrow or tank-type fermentation equipment. During the fermentation process, a compost turning machine regularly turns the material to ensure adequate oxygen and regulate the temperature. The entire fermentation cycle lasts approximately 20-30 days. After composting, the material transforms into a dark brown, odorless humus. It then passes through a cooling device to a temperature below 30°C to prevent nutrient loss during subsequent processing.

The third step is further processing and shaping. The cooled composted material is first crushed to a particle size of 2-3mm in a fine grinder. It is then mixed with a small amount of auxiliary materials such as bentonite and humic acid in a mixer to enhance the fertilizer’s stability. The material then enters the granulation stage, where a rotary drum or disc granulator physically agglomerates the material into 2-5mm granules. The granules are then dried (controlled at 60-80°C) to reduce moisture to below 15%, cooled in a cooler, and screened to separate unqualified particles. The fine powder is then returned to the granulator for reuse.

The finished product is then packaged. Qualified pellets are transported to the packaging workshop, where an automatic packaging machine weighs and seals them into 25kg or 50kg packages, producing finished organic fertilizer.

In short, the organic fertilizer production line, through standardized and mechanized full-process control, efficiently transforms waste into high-quality fertilizer, contributing to environmental protection while providing green nutrients for agriculture.