What Equipment is Required for a Dry Sand Production Line?

A dry sand production line achieves environmentally friendly and energy-saving production of manufactured sand through efficient crushing, screening, dust removal, and powder selection. It eliminates the need for water washing, preventing wastewater and sludge discharge, making it particularly suitable for projects in water-scarce areas or those with stringent environmental requirements. The following are the core equipment required for a dry sand production line and detailed descriptions:

一、 Core Equipment List
1. Feeding Equipment

Vibrating Feeder

Function: Uniformly and continuously feeds raw materials (such as stone, ore tailings, construction waste, etc.) into the primary crusher, preventing equipment overload or idleness.

Features: Simple structure, stable operation, and adjustable feed speed via a frequency converter to accommodate varying production capacity requirements.

Selection Recommendation: Choose a trough or pendulum feeder based on raw material particle size and production capacity.

2. Crushing Equipment

Jaw Crusher (Coarse Crushing)

Function: Crushes large raw materials (e.g., ≤1200mm) to a particle size of 50-100mm, providing the appropriate particle size for subsequent secondary and fine crushing. Features: High crushing ratio and high output, suitable for processing high-hardness materials (such as granite and basalt).
Selection Recommendation: Choose a deep-cavity or European-style jaw crusher based on the hardness of the raw material to improve wear resistance.
Cone Crusher/Impact Crusher (Medium and Fine Crushing)
Cone Crusher:
Function: Crushes coarsely crushed materials (50-100mm) to 20-40mm, suitable for hard materials.
Features: Utilizes a laminated crushing principle, resulting in high wear resistance and low operating costs, but the output particle shape is slightly poorer.
Impact Crusher:
Function: Suitable for medium-hard and soft stone materials (such as limestone and gangue), with fine cubic output particle shape.
Features: High fines content, requiring a powder classifier to adjust sand grading.
Vertical Shaft Impact Sand Making Machine (Shaping Sand Making)
Function: Crushes medium- and fine-crushed materials (20-40mm) to 0-5mm machine-made sand, while optimizing particle shape through the “rock-on-rock” or “rock-on-iron” principle. Features:
The finished sand is cubic in shape, well-graded, and has a controllable fineness (by adjusting the impeller speed or feed method).
Equipped with a hydraulic cover opening device for easy maintenance and replacement of wearing parts (such as the throwing head and peripheral guard plate).

3. Screening Equipment
Vibrating Screen
Function: Classifies the crushed material by particle size, separating qualified sand (0-5mm) from unqualified aggregate (which is returned to the crusher for further processing).
Features:
Multi-layer screen design (usually 3-4 layers) provides high screening efficiency (over 90%).
Equipped with wear-resistant liners and a tensioning device to extend the screen life.
Selection Recommendation: Choose a circular or linear vibrating screen based on production capacity. A probability screen can be used for fine sand screening.

4. Dust Removal Equipment
Pulse Bag Dust Collector
Function: Collects dust generated during the crushing and screening process, ensuring an emission concentration of ≤10mg/m³, meeting environmental requirements. Features:
High dust removal efficiency (≥99.9%), can be equipped with an automatic dust cleaning system (such as pulse jet).
Requires use with fans, ducting, and other equipment to form a closed dust removal system.
Selection Recommendation: Select the dust collector model based on the air volume it handles, leaving a 20% margin.
Sealed Conveying Equipment
Function: Use belt conveyors or enclosed elevators to reduce dust leakage during material transfer.
Features:
Belt conveyors must be equipped with anti-slip and anti-tear devices.
Elevators can be chain or plate chain to accommodate different material characteristics.

5. Powder Classification Equipment
Unpowered Powder Classifier (or Three-Separation Powder Classifier)
Function: Removes stone dust (less than 0.075mm) from machined sand through pneumatic separation, adjusting the sand’s fineness (typically controlled to 3%-15%).
Features:
No additional power required, utilizing aerodynamic principles for efficient powder classification.
Stone dust can be recycled for use in cement admixtures, brick and tile production, and other applications, improving resource utilization. Selection Recommendation: Choose a single-stage or multi-stage classifier based on the sand fineness modulus and powder content requirements.

6. Material Storage and Automation Equipment
Finished Product Silo
Function: Stores qualified machine-made sand and is equipped with a level meter for automated control (such as full-silo alarm and automatic discharge).
Features: Requires rain- and dust-proof design to prevent secondary contamination.
Centralized Control System
Function: Monitors equipment operating status (such as current, temperature, and pressure) through a PLC or DCS system, enabling remote start/stop and fault diagnosis.
Features: Improves production efficiency, reduces manual intervention, and lowers operating costs.

二、Advantages and Application Scenarios
Advantages:
Water-saving and environmentally friendly: No water washing is required, eliminating water waste and wastewater discharge, meeting green production requirements.
High product quality: A powder concentrator controls the fines content, resulting in sand gradation and particle shape superior to wet sand production.
Low operating costs: Eliminating water treatment equipment and sludge disposal reduces maintenance costs by approximately 30%.
Applications:
Concrete batching plants and dry-mix mortar production lines.
Sand production for highway, railway, and bridge projects.
Recycling of solid waste such as construction waste and tailings. Sand and gravel aggregate projects in water-scarce areas or with high environmental protection requirements.