A hydrocyclone, also known as a cyclone separator, is mineral processing equipment used to separate and remove heavier, coarse particles, such as sand and grit, from wastewater or slurries. It is also sometimes used to dewater slurry. Hydrocyclones are classified into two types: pressure-fed and gravity-fed.

The hydrocyclone filter is a classification device. They use centrifugal force to accelerate slurry particle settling and separate particles by size, shape, and specific gravity. Hydrocyclone separators are widely used in the minerals industry, primarily as classifiers in mineral processing. This method has proven highly effective for separating fine particles. They are widely used in closed-circuit grinding and can also deslime, desand, and thicken.

Hydrocyclone Filter Working Principle

When the slurry enters the cylinder tangentially through the feed pipe—driven by a sand pump (or a difference in elevation) at a specific pressure (typically 0.5–2.5 kg/cm²) and flow velocity (approximately 5–12 m/s)—it begins to rotate rapidly along the cylinder wall, generating significant centrifugal force. Under the combined influence of centrifugal force and gravity, coarser and heavier particles are thrown against the wall and move downward along a helical path, eventually discharging through the discharge nozzle at the bottom of the cone. Meanwhile, finer particles form an upward-spiraling slurry flow with the water at the center of the cone and are discharged through the overflow pipe.

Features of Hydrocyclone Filter

1. Features a simple structure with no moving parts. The absence of bearings and gears ensures high overall reliability. Only the liner and underflow orifice are wear parts, resulting in minimal maintenance and easy servicing.
2. Offers high throughput and a compact footprint. Its processing capacity per unit volume far exceeds that of spiral classifiers. Multiple units can be arranged in parallel to form a cyclone cluster, making it suitable for large-scale mineral processing operations.
3. Capable of fine classification. Hydrocyclone filters enable ultra-fine classification, achieving overflow particle sizes in the 10 μm range. They suit secondary grinding and regrinding circuits, offering superior classification efficiency compared to traditional spiral classifiers.
4. Highly adaptable to various processes. A single unit performs multiple functions, including classification, desliming, thickening, desanding, heavy medium recovery, and tailings pre-dewatering. Separation size can be flexibly adjusted by modifying the operating pressure, underflow orifice size, and overflow pipe depth.
5. Lightweight and cost-effective. Installation is flexible, allowing for elevated placement or integration into modular units. They can be easily incorporated into closed-circuit grinding systems with ball mills.

Hydrocyclone Filter Applications

Hydrocyclone filters are widely used in mineral processing operations at both ferrous and non-ferrous metal mines. In unit operations such as closed-circuit grinding and classification, tailings backfilling and dam construction, slurry thickening and clarification, and open-circuit classification—across mines producing iron, copper, gold, and nickel—they have improved metal recovery rates, increased hourly processing capacity, and enhanced the economic efficiency of processing plants.

Technical Parameters of Hydrocyclone Filter