80–100 t/h Limestone Crushing Line Solution: Achieving High-Quality Aggregates at Low Cost

Jaw Crusher + Impact Crusher

In the current market for manufactured sand and aggregates, medium-to-low hardness materials—such as limestone, bluestone, and shale—have become the preferred raw materials for most aggregate plants due to their widespread distribution, ease of processing, and stable aggregate properties. For investors just entering the industry or for small-to-medium scale projects, a production line with a capacity of 80–100 tons per hour (tph) is hailed as the "golden investment sweet spot"—it avoids the burden of massive initial capital outlays while enabling a rapid return on investment.

Today, we will provide an in-depth analysis of a classic production solution—the "Jaw Crusher + Impact Crusher" combination—specifically designed for processing medium-to-low hardness materials.

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I. Core Logic: Why is the "Impact Crusher" Solution the First Choice for Limestone?

In the crushing industry, the selection of secondary crushing equipment (for medium and fine crushing) is critical, as it must be tailored to the specific hardness of the stone being processed.

limestone crushing 

Technical Suitability: Limestone typically falls within the 3–5 range on the Mohs hardness scale, classifying it as a quintessential medium-to-low hardness, low-abrasion material. The Impact Crusher utilizes an impact-based crushing principle, leveraging the stone's own kinetic energy to achieve fragmentation with exceptional efficiency.

Aggregate Shape Advantages: The aggregates produced by an impact crusher are predominantly cubical in shape, featuring sharp edges and corners with an extremely low content of needle-like or flaky particles. This high-quality aggregate is highly sought after by concrete mixing plants, as it significantly enhances the bonding strength within construction structures.

Economic Efficiency: Compared to the cone crushers required for crushing hard rock, impact crushers entail lower initial acquisition costs. Furthermore, when processing low-abrasion materials, the service life of the impact crusher's blow bars is remarkably long.

II. Precision Selection: An In-Depth Breakdown of Equipment for the 80–100 tph Production Line

To achieve a stable output of 80–100 tons per hour, the coordination between every stage of the production line must be seamless. Below is our recommended list of professional equipment selections:

Processing Solution for Medium-to-Low Hardness Stone (Limestone, Bluestone, etc.)

Features: Low abrasiveness; emphasis on the shape of the finished product. The output from an impact crusher is predominantly cubical in shape, with minimal needle-like or flaky content.

1. The Power Source: GZD-850×3000 Vibrating Feeder

The feeder serves as the "beating heart" of the entire production line. It ensures that the raw stone enters the primary crusher at a uniform and continuous rate. This model features adjustable feed rate capabilities and utilizes grate bars to pre-screen soil and debris from the raw ore, thereby ensuring the purity of the material entering the crushing system and minimizing unnecessary wear and tear.

PE500x750 Jaw Crusher

2. The Cornerstone of Coarse Crushing: PE-500×750 Jaw Crusher

Serving as the "first line of defense," the PE-500×750 jaw crusher is responsible for reducing rock blocks—approximately 400mm in size—to less than 100mm. Its simple yet robust structure ensures an exceptionally high operational uptime, even under harsh working conditions.

3. The Core Workhorse: PF-1210 (or PF-1010) Impact Crusher

This constitutes the central piece of equipment in this solution. The PF-1210 impact crusher features a three-chamber crushing design, utilizing the high-speed impact of its rotor to repeatedly propel and collide the stone material against the impact plates. It functions not merely as a crusher, but also as a "shaping machine"; the quality of the resulting crushed stone directly determines the market value of your finished product.

4. Precision Screening: 3YK-1548 Circular Vibrating Screen

The crushed material is transported via conveyor belt to the vibrating screen. The three-deck screen design allows for the simultaneous production of four distinct material specifications:

0–5mm: High-quality manufactured sand;

5–10mm: "Sunflower seed" gravel (fine aggregate) for construction use;

10–20mm: Standard crushed stone aggregate;

20–30mm: Roadbed material or oversize material for recirculation.

5. Conveying System: B500/B650 High-Strength Belt Conveyors

Belt conveyors serve as the vital links connecting each inpidual machine unit. It is recommended to install sufficiently long conveyor belts in the finished product storage area to ensure ample stockpiling capacity.

III. Process Flow Analysis: The Journey from Raw Ore to Premium Aggregate

1.  Primary Crushing (Jaw Crusher): Raw ore passes through the feed hopper and enters the jaw crusher via the feeder for initial size reduction.

2.  Secondary Crushing (Impact Crusher): The material, having undergone primary crushing, is transported via Conveyor Belt No. 1 into the impact crusher for secondary, high-impact crushing. 3.  Closed-loop Screening: The crushed material enters a vibrating screen. 

Accepted Material: Conveyed directly via the finished product conveyor belt to the stockpile. 

Rejected Material (Oversize): Returned via a recirculation conveyor to the impact crusher for further processing until the material meets the required specifications.

4.  Dust Control & Environmental Protection: Key material transfer points are equipped with atomizing spray systems or pulse-jet bag filters to ensure dust emissions comply with environmental standards.

IV. Investment Returns & Operation/Maintenance Recommendations

1. Costs and Returns

The primary advantage of this solution lies in its low initial investment and rapid return on investment. In regions abundant in limestone resources, the cost of the equipment can typically be recouped within six months to one year. Furthermore, given the impact crusher's exceptional adaptability to limestone, the replacement cycle for blow bars (impact plates) is relatively long, resulting in maintenance costs that are significantly lower than those associated with hard-rock processing lines.

2. Advanced Optimization of Finished Product Shape

If you wish to enhance the competitiveness of your finished sand and aggregate products in high-end markets, you can precisely control the particle size distribution by adjusting the rotor speed and the clearance between the impact plates of the crusher.

3. Digitalized Operation & Maintenance

We recommend installing a simple Variable Frequency Drive (VFD) control system. When the feed volume becomes excessive, the system automatically reduces the feeding speed to prevent the main crusher from stalling or clogging. This measure extends the service life of the electric motor and reduces power consumption by 10% to 15%.

V. FAQ: The Top 3 Questions Customers Ask

Q1: When processing limestone with an impact crusher, how often do the wear parts—specifically the blow bars—need to be replaced?

A: This depends on the silica content (abrasiveness) of the limestone. Typically, when processing high-purity limestone, a set of high-quality high-chrome blow bars can sustain continuous production for over 300 to 500 hours. We also recommend that customers extend the service life of inpidual blow bars by flipping them over for use on the reverse side.

Q2: If I decide to increase my production capacity to 150 tons per hour in the future, is this production line layout easy to modify or expand?

A: The current 80–100 t/h configuration is designed with a certain degree of scalability. Ensuring that adequate space is reserved during the initial site planning phase is the key to facilitating future expansion. At a later stage, you may consider upgrading to a higher-power electric motor, or installing a buffer hopper upstream of the impact crusher; by increasing the "load factor," you can achieve a modest boost in output. Alternatively, you could install a second impact crusher in parallel.

Q3: Does this equipment have any specific requirements regarding the moisture content of the stone material?

A: Limestone crushing is relatively sensitive to moisture. If the stone material is excessively wet or contains a high proportion of soil, the liner plates of the impact crusher and the screens of the vibrating sieve are prone to clogging. It is recommended that during the rainy season, you ensure the stockpiles are adequately covered; alternatively, during the feeding stage, you can utilize the screening function of the feeder to pre-remove any excess soil.

About of Baichy Heavy Industry

Baichy Heavy Industry is a high-tech mining equipment company integrating R&D, manufacturing, sales, and after-sales service. Focusing on crushing, grinding, and mineral processing equipment, we provide professional solutions to our customers. We are ISO9001:2015 、certified, and our products include mobile crushing palnts, crawler crushing plant, construction waste crushing plants, jaw crushers, sand making machines, cone crushers, fine crushers, grinding mills, ball mills, etc., all with reliable performance to meet diverse project needs.

Our advantages:

• Professional pre-sales support: Free project design and comprehensive solutions to help you accurately select the right equipment;

• Comprehensive on-site service: Providing installation guidance and worker training to ensure smooth equipment commissioning;

• Reliable after-sales guarantee: A complete after-sales system, timely response to technical inquiries and equipment maintenance, ensuring long-term stable operation.

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