Sand & Gravel Depowdering & Separation Line

Its core function is to separate the excess dust fraction (<75 μm) from the finished sand in order to improve the grain composition and quality of the sand so that it meets construction standards, for example for concrete.

Areas of application

• crushed-stone and sand-and-gravel material production plants;
• artificial sand production lines;
• the cement and mining industries;
• an auxiliary system at concrete batching plants.

Main functions

• 1. Removal of the dust fraction (depowdering) — removal of the excess stone powder, which negatively affects the strength and workability of concrete.
• 2. Classification (particle-size control) — regulation of the grain-size composition of the sand so that it meets the standards.
• 3. Quality upgrading (increasing product value) — increasing the market value of the sand and its competitiveness.
• 4. Environmental protection (dust collection) — fitting a dust-collection system to ensure environmentally clean production.

Main process flow

Raw sand → feeding (belt conveyor) → separation equipment (separator / classifier) → coarse sand output (finished product) → fine fraction (stone powder) enters the dust-collection system → dust collection (bag filter).

Finished products are divided into:

• qualified sand (the main product);
• stone powder (a by-product, which can be reused).

Main equipment

1. Feeding and conveying system

• vibrating feeder;
• belt conveyor.

2. Separation system (key unit)

• high-efficiency separator / air classifier — determines the precision and efficiency of separation.

3. Dust-collection system

• pulse-jet bag filter;
• fan system.

4. Control system

• automatic PLC-based control;
• air-volume regulation by means of a frequency converter.

Technical advantages

• dry process, requires no water (energy saving and environmentally friendly);
• high separation precision, adjustable dust content;
• high level of automation, stable operation;
• low investment costs, easy maintenance;
• can be integrated with existing production lines.

Main technical parameters (example):

• artificial sand from limestone;
• granite sand;
• river sand (dry processing);
• beneficiation tailings (tailing sand);
• mineral-powder mixtures.

YANFU MACHINERY works with professional international logistics partners and can provide door-to-door services for ocean freight, land transport, air freight, multimodal shipping, and oversized cargo.