High-quality sand and aggregates are indispensable for infrastructure construction such as highways, bridges and ready-mix concrete projects. Raw stones vary greatly in size and cannot be directly used in construction. So processors need to crush and screen these materials to achieve sand and gravel aggregates processed. Quarry operators widely adopt the two-stage crushing process equipped with jaw crushers and impact crushers. This is classic solution across the global aggregate industry.

The complete production line consists of four core machines: Vibrating Feeder, Jaw Crusher, Impact Crusher and Vibrating Screen. All units work in coordination to realize automatic continuous production from large raw stones to finished sand and gravel aggregates processed of various sizes.

1. Vibrating Feeder: Uniform Feeding and Pre-Screening

Large stones are fed into the vibrating feeder, which delivers raw materials steadily and evenly to the jaw crusher via vibration. It can pre-screen soil and fine impurities to prevent waste from entering crushing machines and improve overall line efficiency.

2. Jaw Crusher: Primary Coarse Crushing with Powerful Crushing Force

As the core primary crushing equipment, the jaw crusher breaks large hard rocks by strong squeezing force and turns huge boulders into medium-sized stones. Featuring stable structure and wide adaptability, it can process limestone, granite and many other ores, making it the top choice for primary crushing.

3. Impact Crusher: Secondary Crushing for Processed Sand and Gravel Aggregates

Operators feed coarsely crushed stones into the impact crusher for secondary crushing and particle shaping. Materials keep striking against each other inside the crushing chamber. This process reduces particle size and smooths sharp edges to produce cubic aggregates. The finished products feature low flaky particle content, meeting strict requirements for high-grade concrete.

4.Vibrating Screen: Grading to Get Sized Sand and Gravel Aggregates

Operators transport mixed crushed materials to the vibrating screen for grading and separation. With multi-layer screen meshes, the machine separates materials into multiple specifications at one time: 0–5mm stone dust, 5–10mm, 10–20mm, 20–30mm aggregates for different construction projects.

Advantages of the Process

This two-stage crushing line features compact layout, high automation, easy operation & maintenance and favorable initial investment. It produces aggregates with excellent particle shape, ideal for construction aggregate plants, especially medium and small-scale quarries. This process works better for medium & low-hardness rocks like limestone. For high-hardness ores, a cone crusher can replace the impact crusher.

Zhengzhou Zhongya Machinery Co., Ltd. is headquartered in Zhengzhou, Henan Province. As a professional manufacturer with more than 30 years of experience in jaw crusher production, it has established a good reputation in the industry. If you have any questions about jaw crusher selection, model parameters or after-sales service, please click the online customer service, which will provide you with 24-hour professional consultation and answers.