Granite is tough. It is one of the hardest rocks on Earth. Mining bosses know that granite eats weak crushers. You want profit, not downtime. This guide helps you pick the right tools. SBM has 30 years of history. We know how to break rocks. This article explains the machines. We look at data. We look at real cases. We help you win.
Granite is igneous rock. It has high silica content. The silica is often over 70%. This makes it very abrasive. It wears down metal parts fast. The compressive strength is high. It ranges from 100 MPa to 300 MPa. You need heavy duty gear. Standard limestone crushers will fail here. They will break in weeks. You need specific designs. SBM engineers focus on this hardness.
We measure wear potential. It is called the Abrasiveness Index (Ai). Granite usually scores high. An Ai over 0.5 is high wear. This means liners cost money. You must choose the right alloy.
This is the force needed to break it. Granite fights back. Your motor needs high torque. The crusher frame must be rigid. Weak frames crack under stress.
The first stage is coarse crushing. The Jaw Crusher is the king here. It takes big rocks. It makes them smaller. SBM uses the PEW series here. It is a European style jaw crusher. It is better than old models.
A moving jaw presses rock against a fixed jaw. This is the “V” cavity. The motor spins an eccentric shaft. The jaw moves like a chewing mouth. The rock breaks. It falls down. It breaks again. Finally it falls out the bottom.
You must know these terms. CSS is Closed Side Setting. It is the smallest gap at the bottom. It sets your product size. OSS is Open Side Setting. It is the widest gap. For granite, set CSS carefully. A tight CSS reduces capacity. But it makes finer stone. SBM allows easy hydraulic adjustment. You do not need big wrenches.
We use Mn18Cr2 steel. This is high manganese steel. It gets harder as it works. Standard steel is Mn13. Ours lasts 30% longer. The toggle plate protects the machine. If iron enters, the plate breaks. The machine stops safely. This saves the expensive shaft.
Jaw crushers leave flat rocks. You need good shapes. Concrete needs cube shapes. The Cone Crusher does this. SBM recommends the HPT Hydraulic Cone. It is efficient.
This is vital. We do not just smash rock. We press rock against rock. This is lamination. It fills the chamber. Stones break each other. The result is a cube. Flaky needles are gone. Buyers pay more for cubes.
The shaft spins off-center. This is the throw. A big throw means high output. But it needs power. SBM balances this. Our HPT series has optimized speed. The throw is aggressive. It clears the chamber fast.
This is a big pain point. Customers hate changing parts. Granite acts like sandpaper. It eats liners. What is the solution?
Don’t use cheap parts. SBM uses modified high-manganese steel. We add Chrome. We add Molybdenum. These elements fight abrasion. The life span extends. Tests show 1500 hours vs 1000 hours. That is 50% more life. You save on labor too.
Use the right cavity. Do not use a fine cavity for coarse feed. It chokes the machine. Wear concentrates at the top. Use a standard cavity for secondary feed. Spread the wear evenly. SBM experts help you pick. We check your feed size first.
Mining uses lots of power. Energy is a huge cost. Can we lower it? Yes we can.
Don’t use oversized motors. It wastes energy. Don’t use undersized motors. They burn out. SBM calculates torque precisely. We use efficiency class IE3 motors. They run cool. They save about 4-5% electricity. Over a year that is big money.
Run the cone crusher full. But it works. A choke feed uses energy to break rock. A half-empty feed wastes energy. It also makes bad shapes. SBM automated feeders keep it full. The amp draw is steady. Peaks are avoided.
| Feature | Jaw Crusher (PEW) | Cone Crusher (HPT) |
|---|---|---|
| Max Feed Size | 1020 mm | 350 mm |
| Reduction Ratio | 4:1 to 6:1 | 3:1 to 5:1 |
| Main Wear Part | Jaw Plate | Mantle / Concave |
| Output Shape | Fair (Some flat) | Excellent (Cubical) |
| Maint. Cycle | Weekly Check | Daily Auto Lube |
We built a plant in Abuja. The client is a road builder. They needed 300 tons per hour. The rock was grey granite. It was very hard.
Old machines failed. Their bearings overheated. The shape was flaky. The road inspector rejected the stone. They lost money daily. They called SBM for help.
We designed a new line. Primary: PEW860 Jaw Crusher. Secondary: HPT300 Cone Crusher. We added a VSI for sand. We fixed the angles. We used bigger conveyors.
Production hit 320 tons. The shape was 95% cubical. The inspector approved it. The owner Mr. Okon was happy. He said: “SBM tech support is good. They stayed for two weeks. They taught my guys. The machine runs smooth.” Energy cost dropped 15%.
Buying is easy. Running is hard. We solve the worry. SBM sends engineers. We do not just ship boxes.
Concrete must be strong. We give drawings. We check the rebar. A bad base shakes the machine. Vibration kills bearings. We ensure it is level. Precision is key.
Oil is the blood. SBM uses smart oil stations. Sensors watch the heat. If oil gets hot the machine stops. This prevents burnout. You see data on a screen. It is simple.
Here are common questions. We hear these often.
It depends on silica. Usually 1200 to 2000 hours. If silica is 80% it is faster. If you use SBM heavy alloys it lasts longer. Check wear profiles weekly.
Yes you can. It makes high grade sand. Concrete plants love it. Use a VSI crusher. It shapes the sand. It removes internal cracks.
Check the feed. Is it even? Check the foundation. Are bolts loose? Often it is unbalanced wear. Change worn parts in sets. Do not mix old and new parts.
Crushing granite needs respect. It is a tough battle. You need the right weapons. A Jaw plus Cone setup is standard. It works best. Look at total cost. Cheap machines cost more later. Downtime kills profit. SBM offers reliability.
We are the manufacturer. We have the factory. We have the parts. Do not risk your project. We design custom flows. We support you after the sale. Let us build your quarry success.
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Address: No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
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