Compound fertilizer screener Introduction

Tongli fertilizer rotary screener, also known as a rotary sieve or trommel screen, is a mechanical device used in the fertilizer production line to separate and classify granular materials based on their size. It consists of a cylindrical drum that rotates on an inclined axis. The drum is perforated with a series of holes or slots of varying sizes with ss304 screen mesh. The primary purpose of a fertilizer rotary screener is to separate larger particles from smaller ones, ensuring that the fertilizer product is of consistent particle size and quality. In our Tongli fertilizer production plant, there are three types of trommel screen, we have coarse screener, fine screener, and finished product screener, qualified material is passed to the next step and unqualified material will return to the first step for re-processing.

Compound fertilizer trommel screen structure

The structure of the compound fertilizer rotary screener is composed of the following: The frame, the rotary drum, the shaft, the screen mesh, the coarse discharge portal, the fine discharge portal, the drive unit.

Frame and Base: The entire structure is typically supported by a sturdy frame and base that provides stability and support to the rotating components.

Drum: The central component of the rotary screener is the drum, which is a cylindrical or drum-shaped chamber. The drum is usually inclined slightly to allow materials to move from the feed end to the discharge end as it rotates.

Screen Mesh: The inside surface of the drum is lined with a screen mesh. The screen mesh has various openings or perforations of specific sizes. These openings allow particles smaller than the specified size to pass through while retaining larger particles. The size of the screen openings determines the final particle size of the separated materials.

Inlet and Outlet: The drum has an inlet at one end where the raw fertilizer material is fed into the machine. As the drum rotates, the material moves along its length and gradually progresses toward the outlet end. At the outlet end, the separated materials are discharged from the drum.

Motor and Drive Mechanism: The drum is rotated by a motor and drive mechanism, which are typically located at the inlet end. The motor provides the necessary power to rotate the drum at a controlled speed.

Fines Discharge Chute: Fine particles that pass through the screen mesh are collected and discharged through a separate chute. This helps to separate the finer material from the larger particles.

Larger Particle Discharge Chute: Larger particles that are retained by the screen mesh continue to move along the length of the drum and are eventually discharged through a separate chute.

Design principles of compound fertilizer rotary sieve 

Material Feeding: Raw or processed fertilizer material is fed into the rotary screener. The material enters the drum at one end and moves towards the other end as the drum rotates.

Rotating Drum: The drum's rotation causes the material to tumble and move along its length. The centrifugal force generated by the rotation helps separate particles based on their size.

Sifting and Separation: As the material tumbles inside the drum, smaller particles pass through the perforations in the drum while larger particles are retained within the drum. The size of the perforations determines the maximum particle size that can pass through.

Multiple Sieve Levels: Some rotary screeners have multiple sieve levels, each with differently sized perforations. This allows for multiple levels of classification, ensuring that the fertilizer particles are sorted into specific size ranges.

Discharge: Once the material has passed through the drum, it is collected and separated based on its size. Smaller particles can fall through the perforations and are typically collected as the final product. Larger particles that have been retained within the drum are usually discharged separately.

Specifications of compound fertilizer rotary screener

Note: *The diameter is the inner diameter.

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Industry Knowledge extension

What is the raw materials for fertilizer production?

Nitrogen is the most important component in the NPK fertilizer production line, as nitrogen plays a crucial role in plant growth and development. Common nitrogen sources include urea, ammonia, ammonium nitrate, and calcium nitrate, each with different properties and application ranges. For example, urea can lower the pH value of soil and improve acidic soil quality, while ammonium nitrate has a higher absorption and utilization rate in plants, promoting crop growth. 

Phosphorus is also an essential element in NPK fertilizers that promotes root growth, photosynthesis, cold and drought resistance, among other benefits. Common phosphorus sources include sodium tripolyphosphate, ammonium phosphate, and sodium hexametaphosphate, each with varying solubility and reaction rates, depending on crop and soil requirements.

 (Reference: "What are the main raw materials for npk fertilizer production?" https://npk-fertilizer.com/news/industry-news-196.html)

What is the difference between rotary screener and vibrate screener?

Rotary Screener: A rotary screener, also referred to as a rotary sieve or trommel screen, operates by rotating a cylindrical drum. As material is fed into the drum, the rotation causes smaller particles to fall through the screen holes, while larger particles are carried along the length of the drum and eventually discharged at the other end.Rotary screeners are often used for larger, bulkier materials and applications where the material tends to be more difficult to screen due to its size and shape. They are also commonly used in situations where the material contains a mix of different sizes and where a higher throughput is required. In a rotary screener, the material moves through the drum due to the rotation of the cylinder. This action allows the larger particles to move along the length of the drum while the smaller particles pass through the screen holes. Rotary screeners have a more complex design due to the rotating drum and the need for mechanisms to facilitate the rotation. Maintenance and repair can be more involved compared to vibrating screeners. Rotary screeners are often used when higher throughput is required, making them suitable for applications with larger quantities of material to process.

Vibrating Screener: A vibrating screener, also known as a vibratory screener or vibrating sieve, operates by using vibration to move and separate particles. The screen surface is set into motion by a vibrating motor or an eccentric weight system, causing the material to move across the screen and be separated into different size fractions based on particle size. Vibrating screeners are commonly used for fine to coarse screening of dry bulk materials. They are particularly effective for separating particles that have a tendency to stick together, clump, or become static due to their vibrating motion. In a vibrating screener, particles move primarily due to the vibration of the screen surface. This motion helps to stratify the material and ensure efficient separation. Vibrating screeners generally have a simpler design compared to rotary screeners, which can make them easier to maintain and repair. Vibrating screeners are suitable for moderate to high throughput applications and are capable of achieving efficient separation in various particle size ranges.