Jaw Crushers: Primary vs Secondary — Full Comparison & When to Use Each
Introduction: The term "jaw crusher" covers a wide range of machines, from large primary units that accept 1,000+ mm feed to compact secondary units that refine product to 20–50 mm. Understanding the differences is essential for plant design. This guide compares primary and secondary jaw crushers head-to-head and explains when to use one or both in your crushing circuit.
What Makes a Jaw Crusher "Primary" or "Secondary"?
The terms refer to the crusher's position in the circuit, not a fundamentally different machine. However, primary and secondary jaw crushers are optimised differently:
| Feature | Primary Jaw Crusher | Secondary Jaw Crusher |
|---|---|---|
| Position in circuit | First stage — receives ROM (run-of-mine) material | Second or third stage — receives pre-crushed material |
| Feed opening (W × D) | Large: 600×400 mm to 1,600×1,200 mm | Smaller: 250×150 mm to 600×400 mm |
| Max feed size | Up to 1,080 mm | Typically <200 mm |
| CSS range | 60–200 mm | 10–50 mm |
| Throughput | 50–1,000 TPH | 10–200 TPH |
| Motor power | 55–400 kW | 15–90 kW |
| Machine weight | 10–120 tonnes | 2–20 tonnes |
| Chamber geometry | Deep stroke, steep nip angle for large lumps | Shallow stroke, finer tooth profile for smaller product |
| Typical products | 0–150 mm, 0–200 mm for further crushing | 0–31.5 mm, 0–50 mm for direct use |
When to Use a Primary Jaw Crusher Only
- Coarse product is the final output — road sub-base (0–100 mm), gabion fill, rip-rap, or mine backfill where tight gradation is not required.
- Feed to a downstream secondary crusher — the jaw reduces ROM to a size the cone crusher or impact crusher can accept.
- Mobile / temporary operations — a single primary jaw on a track-mounted chassis covers demolition, road construction, and quarry start-ups.
When to Use a Secondary Jaw Crusher
- You need finer product from jaw action — in circuits where cone crushers are not available or not suited (e.g., very hard abrasive rock where cone liners wear too fast).
- Space or budget is constrained — a secondary jaw is cheaper and simpler than a cone or HSI, though it may produce a less cubic product.
- Low-volume fine production — small quarries or recycling plants that don't justify the capital cost of a cone crusher.
When to Use Both — Primary + Secondary Jaw Crusher
Using two jaw crushers in series (sometimes called a "double jaw" circuit) is common in:
- Mining operations where the ore is extremely hard and abrasive, making cone crusher liner costs prohibitive.
- Remote sites where simplicity is paramount — jaw crushers have fewer moving parts and are easier to maintain in the field than cones.
- Recycling plants needing fine recycled aggregate from reinforced concrete — rebar tolerance in both stages is an advantage.
Typical double-jaw flow: ROM feed → GELEN CK primary jaw (CSS 100 mm) → vibrating screen → GELEN CK secondary jaw (CSS 25 mm) → product stockpiles.
GELEN CK Series — Primary & Secondary Models
The GELEN CK jaw crusher range covers both primary and secondary applications with a single platform design. Key models:
| Model | Role | Feed Opening (mm) | CSS Range (mm) | Capacity (TPH) | Motor (kW) |
|---|---|---|---|---|---|
| CK 0604 | Secondary | 600 × 400 | 20–60 | 25–80 | 30 |
| CK 0806 | Secondary / Small primary | 800 × 600 | 30–80 | 40–150 | 55 |
| CK 1008 | Primary | 1,000 × 800 | 50–120 | 80–300 | 90 |
| CK 1210 | Primary | 1,200 × 1,000 | 80–160 | 150–500 | 160 |
| CK 1612 | Heavy primary | 1,600 × 1,200 | 100–200 | 300–800 | 250 |
All models feature hydraulic CSS adjustment, reversible jaw plates, and heavy-duty eccentric shaft bearings.
Application Scenarios
| Scenario | Recommendation | Why |
|---|---|---|
| Granite quarry, 300 TPH, need 0–31.5 mm | Primary jaw + cone | Cone gives best shape at fine sizes |
| Basalt quarry, 100 TPH, need 0–50 mm, no cone budget | Primary jaw + secondary jaw | Simpler; both handle abrasive basalt |
| Limestone quarry, 200 TPH, need 0–100 mm road base | Primary jaw only | Product spec is coarse enough |
| Concrete recycling, 80 TPH, need 0–31.5 mm RCA | Primary jaw + secondary jaw | Both stages tolerate rebar |
| Gold mine, 500 TPH, feed SAG mill (<150 mm) | Large primary jaw only | CK 1612 reaches 100 mm CSS in one stage |
Related Articles
- Jaw Crusher vs Cone Crusher — when a cone replaces the secondary jaw.
- Jaw Crusher vs Impact Crusher — compare with HSI for secondary duties.
- Jaw Crusher Handbook — complete guide from selection to optimization.
- CSS Setting Guide — set the right CSS for each crushing stage.
Conclusion
Primary and secondary jaw crushers serve different but complementary roles. Choose your configuration based on final product size, material hardness, budget, and site complexity. A "double jaw" circuit is a proven, low-maintenance solution for hard materials and remote operations.
GELEN's CK Series covers both roles with models from 600 × 400 to 1,600 × 1,200 mm — all sharing the same hydraulic CSS, reversible plates, and heavy-duty bearing design. Contact us for a plant layout tailored to your requirements.