1. Introduction to Granite

Granite is an acidic igneous rock characterized by high hardness, abrasion resistance, and compressive strength, with a Mohs hardness scale of 6–7. It is one of the most challenging raw materials for mechanized aggregate production. Its mineral composition includes quartz, feldspar, and mica, where quartz’s extreme hardness causes significant wear on crusher components. Consequently, granite processing lines require high-strength equipment based on the “inter-particle compression crushing” principle, such as cone crushers, to ensure operational stability and cost-effectiveness

2. Core Process Flow

This production line adopts a closed-circuit circulation process comprising “two-stage primary crushing + two-stage intermediate/fine crushing + high-efficiency screening,” targeting the simultaneous production of four high-quality aggregate specifications.

  • Primary Crushing (Parallel Jaw Crushers):
    Raw granite ore is uniformly fed via vibrating feeders into two parallel jaw crushers for initial coarse crushing. This dual-crusher configuration functions like a “dual-lane highway,” significantly boosting throughput capacity to meet the 350 TPH feed demand. Output material size: 200–300 mm.
  • Intermediate/Fine Crushing (Series Cone Crushers):
    Coarsely crushed material is elevated by belt conveyors to two cone crushers arranged in series:

    • The first cone crusher reduces material to 40–60 mm (intermediate crushing).
    • The second cone crusher refines particle shape and further reduces size (fine crushing), ensuring uniform gradation and optimal morphology
  • Screening & Closed-Circuit Circulation:
    Material from the cone crushers, combined with oversized returns from subsequent stages, is screened by two parallel vibrating screens. The screens classify aggregates into four specifications (e.g., 0–5 mm, 5–10 mm, 10–20 mm, 20–31.5 mm). Qualified products are conveyed to stockpiles, while oversized material (>31.5 mm) is returned to the secondary cone crusher for reprocessing. This closed-loop system maximizes resource utilization and guarantees precise gradation control 

3. Equipment Configuration Advantages

  • Dual Jaw Crushers (Parallel):
    Establishes high-yield foundations for primary crushing while mitigating single-point failure risks, enhancing system reliability
  • Dual Cone Crushers (Series):
    Critical for processing hard granite. Task specialization—primary crushing force vs. particle shaping—reduces individual load, extends wear-part lifespan, and elevates product value (high cubicity, low flakiness)
  • Dual Vibrating Screens (Parallel):
    Ensures high-capacity screening efficiency without bottlenecks, enabling clear separation of four aggregate grades 
  • Holistic Process Design:
    Compact layout, full automation, stable output, and superior gradation control make this line ideal for supplying high-grade concrete plants and critical infrastructure projects 

4. Customer Feedback

  • Operational Reliability:
    “The line’s greatest strength is its robustness. Since commissioning, continuous operation has been seamless. The series cone crushers deliver consistent output and particle shape, meeting our premium aggregate market requirements.”
  • Cost Efficiency:
    “Despite higher initial investment, long-term economics are favorable. Wear parts last longer than anticipated, reducing maintenance costs and downtime. The 350 TPH target is consistently achieved, ensuring projected ROI.”