Gabbro is a premium material for construction aggregates, road base, concrete production, and asphalt mixtures. This article presents a professional configuration recommendation for a gabbro crushing plant with a throughput of 300–350 tons per hour (TPH), producing three key aggregate fractions: 0–5 mm (fine sand/concrete sand), 10 mm (small aggregate), and 20 mm (medium aggregate), which are widely used in concrete batching, road construction, and general building applications.
Recommended Equipment Configuration
Jaw crusher + cone crusher + cone crusher/impact crusher + VSI sand maker
Stage 1: Feeding and Primary Crushing (Coarse Crushing)
The process begins with a vibrating feeder, which provides a regulated and uniform feed rate to the primary crusher.
For the primary crusher, a jaw crusher is the undisputed choice for gabbro. Jaw crushers are engineered for ruggedness and reliability, capable of handling extremely hard and abrasive materials with compressive strengths exceeding 300 MPa. The jaw crusher reduces this material to an output of approximately 150–200 mm, ready for secondary processing.
Stage 2: Secondary Crushing (Medium Crushing)
The crushed material from the jaw crusher is conveyed to the secondary crushing stage. For gabbro, cone crushers are the preferred technology for secondary crushing due to their compression-based crushing mechanism, which efficiently fractures hard rock with lower wear part consumption compared to impact crushers.
A single-cylinder hydraulic cone crusher with a capacity range of 250–350 TPH is ideally suited for this duty. The hydraulic adjustment and clearing systems provide consistent product sizing and allow the crusher to safely pass uncrushable tramp metal, which is a practical necessity in quarry environments. The secondary cone crusher further reduces the material to a nominal size of 50–70 mm, ensuring efficient operation of the subsequent tertiary stage.
Stage 3: Tertiary Crushing and Screening (Fine Crushing)
The material exiting the secondary cone crusher is directed to a vibrating screen for classification. A multi-deck inclined vibrating screen (e.g., 3YK or 4YK series) with screen apertures selected to produce the target fractions is essential.
For the tertiary crushing, a multi-cylinder hydraulic cone crusher offers superior fine crushing capability and produces aggregates with excellent cubical shape. Alternatively, for operations placing greater emphasis on aggregate shape and lower flakiness index, a vertical shaft impact crusher (VSI) can be deployed at this stage.
Stage 4: Sand Making and Final Classification
The 0–5 mm sand fraction—critical for concrete and mortar applications—requires dedicated processing beyond conventional cone crushing. A vertical shaft impact crusher (VSI) , commonly referred to as a sand making machine, is the industry standard for producing high-quality manufactured sand from hard rock.
Process Flow Summary
The complete process flow can be summarized as follows:
- Feed hopper → Vibrating grizzly feeder: Accepts gabbro up to 800 mm.
- Primary crushing (Jaw crusher): Reduces to 150–200 mm.
- Secondary crushing (Single-cylinder cone crusher): Reduces to 50–70 mm.
- Screening (Multi-deck vibrating screen): Classifies material; oversize returned to secondary crusher.
- Tertiary crushing (Multi-cylinder cone crusher or VSI crusher): Further reduces to target sizes.
- Sand making (VSI crusher): Processes fine material into 0–5 mm manufactured sand.
- Final screening: Separates finished products into 0–5 mm, 10 mm, and 20 mm.
- Stockpiling: Conveyors distribute finished aggregates to designated storage areas.
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