Granite belongs to ultra-hard and high-abrasive igneous rock, which is the preferred raw material for high-speed highway surface aggregate, high-strength concrete and bridge engineering stone. However, granite has compact texture, high compressive strength and strong abrasiveness, bringing great challenges to crushing and shaping. Many small and medium-sized quarries adopt simple two-stage crushing process, resulting in high flakiness rate, poor particle cubicity and unqualified gradation, which can only meet low-grade filling standards and cannot enter high-value engineering material markets.

The core pain point of granite processing is balancing crushing efficiency and particle quality. Single-stage impact crushing will cause serious equipment wear and produce a large number of irregular flaky particles; simple jaw and cone two-stage crushing can only realize particle size reduction without effective shaping, resulting in poor aggregate compactness and low structural stability in concrete and pavement structures. High-grade engineering bidding standards have extremely strict requirements on aggregate flakiness rate, cubicity and gradation, which cannot be met by traditional simple crushing processes.

SMP customized three-stage crushing and full shaping process is specially developed for high-standard granite aggregate production. The first stage adopts heavy-duty jaw crusher for high-capacity coarse crushing to realize primary fragmentation of large granite blocks; the second stage uses high-performance hydraulic cone crusher for laminated fine crushing to reduce internal cracks of particles and eliminate most flaky and elongated stones; the third stage matches VSI vertical shaft impact sand making machine for full rounding shaping, which corrects particle edges and corners and optimizes particle gradation.

After three-stage standardized processing, the flakiness rate of finished granite aggregate is stably controlled below 2%, with uniform gradation, high compactness and strong pressure resistance, fully meeting the strict requirements of high-grade roads, large-scale bridges and super high-rise building projects. This process effectively improves the market premium of granite products, helps quarries get stable high-end engineering orders, and realizes high-profit and sustainable operation of granite quarry projects.

Keywords: granite three-stage crushing, high-grade engineering aggregate, granite aggregate shaping, high-cubicity crushed stone, highway surface aggregate