Powder materials in AAC production require stable conveying to ensure accurate feeding, consistent mixing, and reliable block quality.

With advantages of closed conveying and flexible mounting, screw conveyors are available with personalized schemes customized to material features, handling capacity and production layout conditions.

Screw Conveyor Structure for AAC Production Lines

Screw Flight

Material transportation mainly relies on screw flights. Conveying efficiency is affected by the flight’s diameter, pitch and wall thickness.

For powders adopted in AAC production, the design of screw flights should guarantee smooth material transfer and avoid over-compression of fine powder particles.

Screw Shaft

The screw shaft transfers motor power to the rotating flight. Heavy-duty AAC production lines usually require reinforced shaft designs to withstand continuous operation.

Conveyor Housing

The housing structure isolates materials from external pollutants and suppresses dust generation. Sealed housing design carries great significance when conveying quicklime and cement.

Drive System

Operating speed and torque are controlled by the drive system. To achieve stable feeding performance, different powdered raw materials need to operate at matched rotational velocities.

Integration with AAC Production Equipment

Connection Position	Conveying Purpose
Storage Silo → Screw Conveyor	Controlled powder discharge
Screw Conveyor → Weighing System	Accurate material measurement
Weighing System → Mixer	Stable powder feeding
Powder Processing Equipment → Storage	Continuous material transfer

Powder Materials Conveyed by Screw Conveyors

A variety of powders with distinct conveying requirements are adopted in AAC manufacturing. Screw conveyors are deployed to guarantee steady feeding and standardized material preparation.

To achieve dependable powder transportation, particle size, bulk density, susceptibility to moisture and flow properties should be taken into account during screw conveyor selection.

Powder Material	Characteristics	Screw Conveyor Requirements
Quicklime	Fine powder, moisture sensitive, easy to react with water	Enclosed structure, good sealing, corrosion-resistant design
Cement	High fineness, requires stable dosing accuracy	Precise feeding control, smooth conveying performance
Gypsum Powder	Soft material with lower hardness	Low-speed conveying to reduce material damage
Fly Ash Powder	Fine particles, easy to generate dust	Dust prevention design and reliable sealing
Additives	Small dosage but high accuracy requirement	Customized feeding capacity and control system

Screw Conveyor Types for AAC Powder Handling

Horizontal Screw Conveyor

For the transportation of powdery materials between storage silos, batching systems and mixing facilities, horizontal screw conveyors represent a prevalent transport option.

The horizontal structure provides stable material movement with relatively simple installation and maintenance. It is suitable for short-distance conveying where consistent powder feeding is required.

In AAC production lines, horizontal screw conveyors are often installed below cement silos, lime silos, or powder storage systems to deliver materials accurately into the weighing and mixing section.

Typical Applications:

• Cement feeding system
• Quicklime transportation
• Gypsum powder transfer
• Powder material dosing units

Inclined Screw Conveyor

Powdered raw materials can be lifted to different heights by inclined screw conveyors, which deliver adaptable transportation schemes for compact AAC workshops.

Stable material flow and consistent running performance depend on properly configured inclination angle, operating speed and screw diameter.

Typical Applications:

• Connecting lower storage systems with upper mixing platforms
• Vertical layout production lines
• Powder transfer with elevation differences

Vertical Screw Conveyor

Vertical screw conveyors transport powder materials upward in limited spaces, saving floor area and requiring optimized design for stable conveying.

Typical Applications:

• Compact AAC production plants
• Limited installation spaces
• High-level powder feeding systems

Selection Based on Powder Material Characteristics

Moisture Sensitivity

Quicklime and mineral powders are moisture sensitive, requiring protection against adhesion, blockage, and reduced conveying efficiency.

Fully enclosed screw conveyors with reliable sealing help improve material protection and support stable AAC powder handling.

Flowability

Flow characteristics differ among different types of powders. Fine cement can flow freely in most cases, but humidity conditions and particle properties may cause poor mobility of other powders.

It is necessary to modify screw diameter, rotational velocity and feeding configuration to match the material flow performance.

Material Condition	Recommended Design Focus
Good flowability powder	Standard screw flight design
Sticky powder	Larger clearance and anti-adhesion structure
Moist powder	Sealed conveying and moisture protection
High-density powder	Stronger motor and reinforced screw shaft

Feeding Accuracy

Since material proportions exert influences on slurry quality and finished block properties, AAC manufacturing demands accurate powder feeding.

Screw conveyors can realize continuous and stable material supply; meanwhile, variable speed control helps boost metering accuracy and maintain consistent process conditions.

Capacity Selection of Screw Conveyors

Mingjie Machine provides screw conveyor solutions with different specifications according to AAC production requirements. The equipment can be customized based on material type, processing capacity, and plant layout.

Parameter	Typical Range
Screw Diameter	160–500 mm
Conveying Capacity	1–80 m³/h
Conveying Length	Customized according to layout
Installation Type	Horizontal, inclined, vertical
Material	Carbon steel or stainless steel options

Powder density and production requirements jointly define conveying capacity. The deployment of several screw conveyors ensures continuous material feeding for AAC manufacturing lines.

Custom Screw Conveyor Design

Model	Main Parameters	Suitable AAC Applications
MJ-LS100	Diameter: 100 mmCapacity: 1–8 m³/h	Additives feeding, small powder transfer systems
MJ-LS200	Diameter: 200 mmCapacity: 5–14 m³/h	Cement, gypsum, fly ash conveying in small AAC lines
MJ-LS250	Diameter: 250 mmCapacity: 10–25 m³/h	Standard AAC batching and powder feeding systems
MJ-LS315	Diameter: 315 mmCapacity: 20–40 m³/h	Medium-scale AAC production lines
MJ-LS400	Diameter: 400 mmCapacity: 40–80 m³/h	Large AAC plants with high-volume powder transportation

AAC factories often have different production capacities, layouts, and raw material conditions. Standard screw conveyors may not always fit existing production systems.

Specialized screw conveyor solutions may be developed considering the items listed below:

• Powder material characteristics
• Required conveying capacity
• Installation height and distance
• Connection with AAC equipment
• Automation requirements

For example, a compact AAC plant may require a shorter inclined screw conveyor due to limited installation space, while a large-scale production line may need multiple conveyors connected with automatic batching equipment.

Screw Conveyor Selection for Raw Materials in AAC Production

Production Requirement	Recommended Screw Conveyor Solution
Small AAC production line	Compact horizontal screw conveyor
Large-scale continuous production	Heavy-duty screw conveyor system
Limited plant space	Inclined or vertical screw conveyor
Moisture-sensitive powder	Fully enclosed sealed conveyor
High feeding accuracy	Variable-speed dosing screw conveyor

Material and Manufacturing Options

Screw conveyors with outstanding durability are essential for AAC factories to keep stable operation under continuous production loads.

Carbon steel and stainless steel alternatives differ in structural strength, anti-corrosion capability and design adaptability.

Properly chosen screw conveyors can realize consistent powder supply and effective raw material treatment. Tailored designs are conducive to maintaining dependable AAC manufacturing processes.