Screening Equipment is used to classify, separate, and size bulk materials during fertilizer, building materials, chemical, and mineral processing. By relying on controlled vibration, rotary movement, mesh aperture, and material flow characteristics, Screening Equipment ensures accurate particle distribution and stable downstream processing. In production lines supplied by Nantong Alisen Environmental Protection Technology Co., Ltd., screening units are integrated with crushers, granulators, dryers, coolers, and conveyors to support continuous and precise material handling.

1. Core Functions and Performance Features

Screening Equipment in this category generally shares the following characteristics:

• Material classification: separating fine, medium, and oversized particles.

• Stable screening efficiency: dependent on screen structure, vibration amplitude, and rotational speed.

• Adjustable screening accuracy: achieved through mesh design, screen layer configuration, and feed rate.

• Compatibility with fertilizer processes: suitable for compound fertilizer, organic fertilizer, BB fertilizer, potassium sulfate production, and related building materials lines.

These shared functions allow manufacturers to maintain uniform particle size distribution, reduce material waste, and improve product consistency.

2. Working Principles of Common Screening Equipment

(1) Drum Screening Machine (Rotary Screening Machine)

Principle:
Material enters a rotating cylindrical drum fitted with screen holes. As the drum rotates, smaller particles pass through the mesh while oversized materials move toward the discharge end.

Applications:
Compound fertilizer, organic fertilizer, sand, coal, and building materials.

Advantages:

• Large processing capacity

• Stable operation

• Suitable for wet and sticky materials

(2) Vibrating Screening Machine

Principle:
Material is stratified and separated through high-frequency vibration. Particles move along the screening surface according to size and density differences.

Applications:
Granular fertilizers, chemical powders, aggregates, and mineral grading.

Advantages:

• High screening accuracy

• Adjustable vibration frequency

• Suitable for fine and dry materials

(3) Linear Vibrating Screen

Principle:
Dual vibration motors generate a linear motion that moves material forward and separates particles across multiple layers.

Applications:
Fine granular fertilizers, sand, plastic pellets, and chemical products.

Advantages:

• Multiple screening layers

• Uniform material distribution

• Easy screen replacement

(4) High-Frequency Screen

Principle:
Applies high vibration frequency to improve separation efficiency of small particle sizes.

Applications:
Fine chemical powders, mineral processing, and desliming operations.

Advantages:

• High precision screening

• Effective separation of ultra-fine materials

3. Comparison of Different Screening Equipment

4. Application Cases

Case 1: Compound Fertilizer Production Line

Using a drum screening machine supplied by Nantong Alisen Environmental Protection Technology Co., Ltd., a fertilizer plant achieved stable particle classification and reduced irregular granules in the final product.

Case 2: Organic Fertilizer Processing

A vibrating screen was used to separate fermented organic matter from fine powder, improving the purity of pelletized products.

Case 3: Potassium Sulfate Production

Linear vibrating screens were adopted to classify crystals, supporting continuous feeding for downstream drying and packaging.

5. Maintenance Guidelines for Screening Equipment

To ensure stable performance, operators should follow these maintenance practices:

Daily Inspection

• Check screen mesh tension and integrity

• Inspect vibration motor temperature

• Confirm fasteners are secure

Regular Maintenance

• Replace worn or clogged mesh plates

• Lubricate bearings based on operating hours

• Clean internal material residues

Operational Tips

• Avoid overloading the screen plates

• Maintain uniform material feeding

• Schedule periodic alignment checks for vibration motors

Proper maintenance extends equipment service life and ensures consistent screening accuracy.

6. Frequently Asked Questions (FAQ)

Q1: How to choose the right Screening Equipment?
Selection depends on material characteristics, required particle size distribution, output capacity, and installation space.

Q2: What mesh size should be used for fertilizer production?
Mesh size is determined by granule specifications. Compound fertilizer commonly uses round-hole meshes between 3–8 mm.

Q3: Can Screening Equipment handle wet materials?
Yes. Drum screening machines are suitable for wet or sticky materials; vibrating screens are generally better for dry and uniform materials.

Q4: How often should screens be replaced?
Replacement frequency depends on wear conditions, usually every 3–6 months under continuous operation.

Q5: Can screening systems be integrated into automated production lines?
Yes. In production lines engineered by Nantong Alisen Environmental Protection Technology Co., Ltd., screening units can be synchronized with granulation, drying, cooling, and conveying systems.