Processing highly abrasive granite into multiple fine aggregate specifications is a severe metallurgical challenge. This engineering case study explores a 200 to 300 Tons Per Hour (TPH) granite crushing plant commissioned in Botswana. Written by a senior process engineer at Liming Heavy Industry, the article details how to configure C6X Jaw Crushers and parallel HPT Multi-Cylinder Cone Crushers to minimize wear part costs. It also explains how to design a dual S5X Vibrating Screen circuit to accurately classify six distinct particle sizes from 1mm to 19mm.
When a client from Botswana recently approached our engineering team, their project requirements were incredibly specific: a production capacity of 200 to 300 tons per hour processing raw granite, with the final discharge strictly classified into six distinct fine particle fractions—1mm, 3mm, 5mm, 6mm, 9mm, and 19mm. Frankly speaking, granite is a notoriously “hard bone” in the mining industry, possessing massive compressive strength and high silica content. Combining this extreme abrasiveness with the demand for numerous ultra-fine aggregate specifications presents a monumental challenge to both the lifespan of consumable wear parts and the volumetric efficiency of the screening system.
Today, utilizing this specific African project as a benchmark, I will speak from the perspective of a senior process engineer to break down exactly how we executed the process design and equipment selection. This guide will provide highly practical references for industry peers operating in the African market or processing highly abrasive hard rock.
I. Analyzing Raw Material Characteristics and Engineering Bottlenecks
Although the client did not specify the exact raw feed dimensions, based on standard quarry blasting practices in Botswana, we engineered the primary station for a maximum feed size of 800 millimeters. The compressive strength of typical granite ranges from 150 to 250 megapascals, accompanied by a devastatingly high silica content. If a plant manager attempted to use a horizontal impact crusher or a heavy hammer crusher for this material, the replacement cost of the chrome blow bars would completely destroy the project’s profit margins.
Therefore, the metallurgical flowsheet must strictly adhere to the “lamination crushing” principle, deploying a heavy-duty jaw crusher for primary coarse reduction and hydraulic cone crushers for medium and fine reduction. Furthermore, outputting six distinct sizes from 1mm to 19mm generates a massive recirculating load. If the screening efficiency drops—especially on the 1mm and 3mm fine meshes—the cone crushers will suffer from severe over-pulverization, choking the entire production line and slashing the hourly capacity.
II. Core Equipment Selection and Configuration
To safely secure the 200 to 300 tons per hour target capacity against the abrasive granite, we finalized the following core machinery manifest utilizing proven equipment from Liming Heavy Industry:
1. Primary Crushing Stage: C6X110 Jaw Crusher
For the primary coarse reduction, we deployed the C6X110 Jaw Crusher. This machine is a flagship primary crusher. With a massive feed opening measuring 1100 by 850 millimeters, it effortlessly swallows 800-millimeter blasted boulders. The C6X series features a highly durable non-welded, bolted frame and an optimized toggle plate geometry that provides a massive discharge adjustment range. In remote regions like Botswana, mechanical simplicity and ease of maintenance are paramount. The automated hydraulic wedge adjustment and cavity clearing system save operators significant mechanical downtime.
2. Secondary and Tertiary Crushing Stage: Dual HPT300 Multi-Cylinder Cone Crushers
When processing hard granite, the multi-cylinder hydraulic cone crusher is the undisputed premier choice. To guarantee the 200-300 TPH output while strictly controlling the final particle shape, we configured two HPT300 Multi-Cylinder Hydraulic Cone Crushers to operate in parallel. The closed-side setting of the HPT300 can be flexibly adjusted between 8 and 38 millimeters. Its lamination crushing principle not only increases crushing efficiency but significantly lowers the consumption rate of the expensive manganese mantles and bowl liners, reducing daily operating expenses. Running two units in parallel provides exceptional operational redundancy to manage fluctuations in rock hardness without stalling the plant.
3. Screening Stage: Dual S5X2460 Vibrating Screens
The screening section is the absolute bottleneck of this specific project. Because the client demanded six distinct outputs, a standard three-deck screen was entirely inadequate. We deployed two massive S5X2460 Vibrating Screens (configuring one as a three-deck unit and the other as a four-deck unit). The S5X series is engineered by Liming Heavy Industry specifically for massive aggregate lines, featuring ultra-high-strength side plates, a weld-free construction, and oil-lubricated exciters. Most importantly, the vibration amplitude and frequency can be micro-adjusted on site. This capability dramatically improves the passing rate for the ultra-fine 1mm and 3mm fractions, effectively eliminating the severe risk of screen blinding.
III. Discharge Control and Screen Mesh Configuration Strategies
Novice engineers frequently struggle when faced with complex, multi-specification output demands. The core secret lies entirely in the rational pairing of screen meshes and the design of the closed-circuit loop.
In this project, the 19mm, 9mm, and 6mm fractions act as medium-coarse aggregate, while the 5mm, 3mm, and 1mm fractions act as fine aggregate. We configured the first S5X2460 as a three-deck screen, installing 19mm, 9mm, and 5mm meshes from top to bottom. The second S5X2460 was configured as a four-deck screen dedicated exclusively to the fines, utilizing 6mm, 3mm, and 1mm meshes.
A Critical Field Detail: Many regions in Botswana experience extended dry seasons with severe water scarcity. Therefore, we strongly recommended a dry screening process. To prevent the 1mm and 3mm meshes from becoming completely choked by microscopic stone powder, we integrated air classifiers (wind separators) ahead of the vibrating screens and installed highly flexible, wear-resistant polyurethane anti-blinding screen panels. This setup guaranteed the target fine material yield while drastically lowering the screen mesh replacement frequency.
IV. Real-World Project Execution Experience in Africa
Executing an overseas project, particularly in the African market, requires more than just manufacturing good machinery. Successful deployment and long-term after-sales support are the true keys to profitability.
The industrial machining infrastructure in Botswana is relatively developing. Therefore, when designing this 200-300 TPH production line, we heavily emphasized “modular architecture” and “forward-deployed spare parts.” Liming Heavy Industry maintains comprehensive spare parts warehouses and dedicated service teams across Southern and East Africa. From initial equipment dispatch and installation supervision to the long-term supply of consumable manganese liners, we ensure a rapid, localized response.
Additionally, addressing the potential voltage fluctuations inherent in the local electrical grid, we engineered robust voltage stabilization and soft-start mechanisms directly into the electrical control cabinets. This ensures that the massive motors powering the C6X jaw crusher and HPT cone crushers do not shock the local grid upon startup, guaranteeing exceptionally smooth and stable daily operations.
V. Conclusion
This 200 to 300 TPH granite crushing production line in Botswana successfully resolved the extreme wear challenges of high-hardness material while flawlessly executing the precise classification of six distinct aggregate specifications from 1mm to 19mm. This was achieved through the highly logical, engineered combination of the C6X Jaw Crusher, HPT Cone Crushers, and S5X Vibrating Screens. In process engineering, there are no shortcuts; success relies entirely on a profound metallurgical understanding of the raw material and absolute precision in equipment configuration. If you are planning a granite or basalt crushing project, contact the engineering team at Liming Heavy Industry for a customized, high-efficiency mechanical solution.
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