Many users will search for questions such as Can jaw crushers crush granite? Can they crush limestone? Can they crush pebbles? Can construction waste be crushed? In response to user questions, Baichy heavy industry will have different requirements for equipment performance according to different materials (hardness, humidity), and users need to select models in a targeted manner.
As the core equipment for coarse and medium crushing, the application scenarios and material adaptation of jaw crushers need to be combined with material characteristics (hardness, humidity, composition, etc.) and equipment performance for comprehensive selection.
1. Granite
Features: high hardness (Mohs hardness 6-7), high compressive strength (usually ≥150MPa), and high wear is easy to occur during crushing.
Adaptability:
✅ Can be crushed, but attention should be paid to:
• Use high-strength materials (such as high manganese steel jaw plates) to improve wear resistance.
• Configure higher-power motors (such as PE series deep cavity types) to cope with high resistance.
• It is recommended that the feed size is ≤1200mm and the discharge port is adjusted to 100-200mm.
• Check the jaw plate wear regularly to avoid efficiency loss.
2. Limestone
Characteristics: medium-low hardness (Mohs hardness 3-4), but it is easy to adhere when the moisture content is high, causing blockage.
Adaptability:
✅ Ideal adaptation, optimized configuration is required:
• Choose an arc-shaped jaw plate design (such as the PEX fine crushing series) to increase the crushing ratio and reduce over-crushing.
• When the humidity is greater than 10%, it is recommended to install a vibrating feeder or adjust the feed inclination angle to prevent sticking.
• The discharge particle size can be finely adjusted to 20-50mm to meet the needs of building material aggregates.
3. Pebbles
Characteristics: high hardness (Mohs 7), smooth surface, easy to cause the jaw plate to slip or uneven wear.
Adaptability:
✅ It can be crushed, but needs targeted design:
• Use toothed jaws to increase friction and prevent material sliding (such as PEV series hydraulic adjustment models).
• Use pre-screening equipment to remove fine particles and improve efficiency.
• It is recommended to reduce the spindle speed (280-330rpm) and extend the extrusion time to ensure the crushing effect.
4. Construction waste
Characteristics: Complex composition (including steel bars, wood, concrete blocks, etc.), which can easily cause equipment overload or jam.
Adaptability:
✅ It needs to be pre-treated before adaptation:
• Pre-magnetic separation and manual sorting to remove metal impurities to avoid damage to the equipment.
• Use hydraulic protection jaw crusher (such as HD German version) to automatically release pressure when encountering unbreakable objects.
• Adjust the discharge port ≥150mm, handle large pieces of concrete, and use impact crusher for secondary crushing.
Precautions
• Humidity treatment: Sticky materials need to reduce closed side discharge (CSS) or add scrapers.
• Maintenance cycle: It is recommended to check the jaw plate every 300 hours for high-hardness materials and clean up residual impurities after construction waste operations.
• Capacity matching: Calculate the theoretical capacity according to the crushing ratio formula (feed size/discharge size), and reserve 20% margin.
Through targeted selection and configuration optimization, the jaw crusher can efficiently adapt to a variety of material scenarios. It is recommended to consult Baichy heavy industry for customized solutions based on specific working conditions.
