Granite is an intrusive rock in igneous rocks, with a high quartz content, typically ranging from 20-50%, and in some cases reaching 50-60%. It is a rock with high hardness and strong abrasiveness, making it difficult to process and placing high demands on crushing equipment, especially the durability of wear parts.
Generally, the main crushers can be selected as jaw crushers (for primary crushing), cone crushers (for secondary and tertiary crushing), and vertical shaft impact crushers (for sand making and shaping). Different crushers are suitable for different crushing stages and need to be used in combination. For granite, a typical hard rock, a 2- to 4-stage crushing process can be adopted depending on production scale and product requirements.
As a direct-operated factory with a 42,000 m² production base, DUMA has specially developed high-manganese alloys (such as Mn18Cr2 and Mn22Cr2) and composite wear-resistant liners tailored to the high abrasiveness of granite. Through precise heat treatment processes, our wear parts exhibit excellent work-hardening ability when handling materials with high quartz content, effectively extending service life by 20%-40% and significantly reducing your operating cost per ton.
Two-stage Crushing: Jaw Crusher + Cone Crusher
This is the most common two-stage configuration for granite aggregate production lines. The jaw crusher is responsible for primary crushing, breaking large raw stones mined from the mountain into medium sizes (discharge size generally around 5-30 cm). The cone crusher handles secondary and fine crushing. With different cavity types (coarse, medium, or fine), it can produce various specifications of finished aggregates such as 5-10 mm, 10-20 mm, and 20-31.5 mm after screening. This configuration is simple, reliable, and runs smoothly, making it a very economical and practical choice for small and medium-sized granite crushing projects.
In terms of wear parts, the jaw plates and side guard plates of the jaw crusher, as well as the mantle and concave of the cone crusher, are the main consumables. Due to granite's high hardness and high quartz content, wear parts experience relatively fast wear. It is recommended to prioritize high-manganese steel or high-chromium cast iron materials, and composite wear-resistant technologies (such as embedded hard alloys or surface hardfacing) can be adopted to significantly extend the service life of wear parts and reduce the wear cost per ton of material.
Three-stage Crushing: Jaw Crusher + Cone Crusher + Vertical Shaft Impact Crusher
Building on the two-stage process, a vertical shaft impact crusher (sand making machine) is added to form a classic three-stage crushing process. On one hand, the VSI crusher can shape the aggregates by removing sharp edges, making the particle shape more rounded and full, which meets the high-standard requirements for aggregates used in high-grade highways, railways, and other premium projects. On the other hand, it can further crush part of the aggregates, stone powder, and edge materials into 0-5 mm manufactured sand, enabling one production line to produce both aggregates and sand simultaneously.
Regarding wear parts, the three-stage configuration has even higher requirements for wear resistance. In addition to the jaw crusher jaw plates and cone crusher mantle and concave, the rotor, blow bars (or throwing heads), impact plates, and peripheral guard plates of the vertical shaft impact crusher are the core wear components. The strong abrasiveness of granite causes these parts to wear quickly. It is recommended to use high-chromium alloy or ceramic composite materials for the rotor and blow bars, and high-wear-resistant manganese steel or imported wear-resistant steel plates for the peripheral guard plates. Reasonable rotor speed and feed control should also be applied to minimize the frequency of wear part replacement and improve the overall operating rate of the production line.
Four-stage Crushing: Jaw Crusher + Single-cylinder Hydraulic Cone Crusher + Multi-cylinder Hydraulic Cone Crusher + Vertical Shaft Impact Crusher
The four-stage crushing process mainly uses two cone crushers (single-cylinder hydraulic cone + multi-cylinder hydraulic cone) in the secondary and tertiary crushing stages. The two cone crushers work together to share the crushing pressure and wear load, resulting in higher crushing efficiency and greater single-machine capacity. This configuration is particularly suitable for medium and large-scale hard rock crushing projects.
In terms of wear parts, the four-stage process offers clear advantages. The single-cylinder and multi-cylinder hydraulic cone crushers can be equipped with different cavity types and wear part materials according to different working conditions. The front-stage cone crusher focuses on crushing capacity and can use thicker high-manganese steel mantles and concaves; the rear-stage focuses on fine crushing and shaping and can adopt high-chromium or ceramic composite wear parts. This "gradient consumption" approach makes the overall wear part life more balanced and reduces the wear cost per ton of sand and gravel. Meanwhile, the wear parts of the vertical shaft impact crusher follow the same selection as in the three-stage process, but due to more uniform feed size, actual wear is relatively milder, further lowering maintenance costs.
In addition to the main crushers, a complete granite crushing production line also requires supporting equipment such as feeders, vibrating screens, and belt conveyors to handle material feeding, conveying, and screening.
The above represents the general configuration for granite crushing production lines. Specific equipment selection and wear part solutions should be optimized according to actual production capacity, raw material characteristics, and product requirements. In granite hard rock crushing, the selection and maintenance of wear parts directly affect production costs and downtime. It is strongly recommended to fully consider the material, structure, and ease of replacement of wear parts during the equipment selection stage to achieve long-term economical and efficient operation.
