Display of Finished Crushed Granite Products
For a granite crushing production line with an hourly capacity of 1,600 tons, the challenge lies not in selecting the specific machine models, but in first firmly defining the capacity basis. Based on a finished product output of 1,600 t/h and an oversize recirculation rate of 28% in the closed-circuit system, the throughput for the final stage (fine crushing and screening) is approximately 2,222 t/h; the primary crushing stage is rated for a raw ore input of ≥1,700 t/h, while the secondary crushing stage handles 1,600 t/h. A parallel dual-line configuration (2 × 800 t/h) is recommended: the entire line comprises 14 units across five categories of main equipment, with a total installed power of approximately 3,700 kW and an electricity consumption of about 2.1–2.2 kWh per ton.
I. Firmly Defining the "1,600 t/h" Basis
"1,600 tons per hour" can be interpreted in two ways: 1,600 t/h of finished product or 1,600 t/h of raw ore feed. Granite crushing lines are typically calculated by working backward from the former—this is the standard basis used in tenders for sand and aggregate production lines, and it is also the most demanding scenario for equipment selection. If calculated based on a raw ore feed of 1,600 t/h, the finished product output would be 1,536 t/h (4% lower), and the throughput in the final stage would drop to approximately 2,133 t/h.
II. Granite Characteristics Dictate Crushing Stage Configuration
Granite has a Mohs hardness of 6–7, a compressive strength of 150–300 MPa, high abrasiveness, and a bulk density of approximately 1.6–1.7 t/m³. There is only one conclusion regarding the crushing process configuration for granite: jaw crushers are used for primary crushing, while multi-cylinder hydraulic cone crushers must be used for secondary and fine crushing. Impact crushers and hammer crushers experience excessive liner wear with this type of material, resulting in a per-ton cost that exceeds that of cone crushers; multi-cylinder hydraulic cone crushers utilize an inter-particle (lamination) crushing chamber, capable of keeping the content of needle- and flake-shaped particles below 10%, thereby meeting the requirements for high-grade aggregates.
III. How to Back-Calculate Stage-Specific Throughput from Granite Crushing Line Capacity
In a granite crushing line featuring a three-stage, one-closed-circuit configuration, the material volume processed at each stage exceeds the final product output; this is the most common pitfall encountered when calculating production capacity.
Configuration Analysis of a 1,600 t/h Granite Crushing Production Line
① Final stage (fine crushing + screening): Oversize rate on the screen calculated at 28%; throughput = 1,600 &pide; (1 − 0.28) ≈ 2,222 t/h
② Primary crushing stage: Run-of-mine (ROM) feed = 1,600 &pide; (1 − 0.04) ≈ 1,667 t/h; feeder capacity specified at ≥1,700 t/h
③ Secondary crushing stage: Primary crusher output minus dust and desliming losses ≈ 1,600 t/h
④ Jaw crusher feed opening: ≥ Max ROM lump size &pide; 0.85; for a max lump size of 1,000 mm, opening must be ≥1,176 mm
| Stage | Calculation Basis | Throughput |
|---|---|---|
| ROM Feed (Primary Crushing) | 1,600 ÷ (1 − 4%) | ≈1,667 t/h |
| Secondary Crushing | Primary output minus losses | ≈1,600 t/h |
| Fine Crushing + Screening (Closed-circuit) | 1,600 ÷ (1 − 28%) | ≈2,222 t/h |
| Per Line (2 lines total) | Above figures ÷ 2 | 833 / 800 / 1,111 t/h |
IV. Equipment Configuration Table for 1,600 t/h Granite Crushing Production Line
| Process Step | Model | Quantity | Rated Capacity (Single Unit) | Power |
|---|---|---|---|---|
| Grizzly Feeder | ZSW1500×6000 | 2 | 550–1,200 t/h | 30 kW × 2 |
| Primary Jaw Crusher | PE1500×1800 | 2 | 520–1,100 t/h | 280 kW × 2 |
| Secondary Cone Crusher | HP800 (C-Cavity) | 2 | 520–1,050 t/h | 630 kW × 2 |
| Fine Cone Crusher | HP500 (MC-Cavity) | 4 | 330–605 t/h | 400 kW × 4 |
| Circular Vibrating Screen | 4YK3070 (4-deck) | 4 | 220–1000 t/h | 55 kW × 4 |
The finished product from the granite crushing line consists of four size fractions: 0–5, 5–10, 10–20, and 20–31.5 mm. Total installed power for the main machinery is 3,700 kW (2×30 + 2×280 + 2×630 + 4×400 + 4×55); including conveyors and dust removal systems, the total is approximately 4,070 kW, with an electricity consumption of about 2.1–2.2 kWh/t. These parameters are based on official rated ranges; pricing and construction timelines are not included.
V. Why the granite crushing line must be split into two 800 t/h lines
A single-line configuration is unfeasible at the primary crushing stage: the largest jaw crusher (PE1500×1800) has a rated upper limit of 1,100 t/h, which is less than the raw ore input of 1,667 t/h; therefore, at least two jaw crushers are required. If the final crushing stage (2,222 t/h) were centralized, it would require 4–5 fine-crushing cone crushers operating at the same location; maintenance on any single unit would halt the entire line. By splitting the system into two lines, one line can continue operating at approximately 800 t/h (50% capacity) while the other undergoes maintenance.
jaw crusher (PE1500×1800)
VI. Four verification points for the granite crushing line
• Feed opening vs. maximum lump size: The PE1500×1800 has a 1500×1800 mm feed opening and a maximum feed size of 1,200 mm, accommodating the 1,000 mm raw ore with a safety margin. Although the PE1200×1500 can also handle 1,000 mm raw ore, its capacity range of 400–800 t/h hits the upper limit of the 800 t/h line capacity, leaving no margin; therefore, it was excluded from the plan.
• Intermediate crushing capacity within the optimal range: An 800 t/h throughput per line falls within the 520–1,050 t/h range of the HP800 (C-cavity) crusher, providing a margin of approximately 24%.
• Fine crushing capacity is "sufficient but without surplus": Each line handles 1,111 t/h using two HP500 crushers (MC crushing chamber)—totaling 660–1,210 t/h—leaving a margin of only about 8%. The MC chamber (minimum discharge setting of 22 mm) is selected for fine crushing; if the target product is primarily 10–20 mm, the F chamber must be used instead, reducing single-unit capacity to 270–535 t/h and requiring additional units. If the oversize rate rises to 35%, the final-stage throughput reaches 2,462 t/h (1,231 t/h per line), exceeding the upper limit; an additional fine-crushing cone crusher must be added—this is the sole trigger for an upgrade.
• Screen deck sizing is based on throughput rather than final product output: Each unit handles approximately 556 t/h, falling within the operating range of the 4YK3070 model; motor power is customized for local voltage (380/400/440 V) and frequency (50/60 Hz).
Granite crushing production line
sand and aggregate production line
VII. FAQ
Q1 How many jaw crushers are needed for a granite crushing line with an hourly output of 1,600 tons?
Two PE1500×1800 units. The maximum rated capacity of the largest jaw crusher is 1,100 t/h; a single unit cannot handle the raw ore feed of approximately 1,667 t/h, so one unit is assigned to each of the two 800 t/h processing lines.
Q2 Can an impact crusher be used for the secondary crushing stage of granite?
Not recommended. Granite has a Mohs hardness of 6–7 and is highly abrasive; impact crusher blow bars and liners wear out quickly, resulting in a per-ton cost that exceeds that of cone crushers. A multi-cylinder hydraulic cone crusher should be selected for the secondary stage, as it allows the content of flaky and elongated particles in the final product to be controlled within 10%.
Q3 Why is throughput calculated using the "1 − oversize rate" formula?
In a closed-circuit screening process, oversize material is returned for re-crushing; therefore, the screen decks and fine-crushing cone crushers actually process the sum of the "final product" and the "returned material." Based on an oversize rate of 28%, a finished product output of 1,600 t/h corresponds to a total throughput of 2,222 t/h; selecting equipment rated for 1,600 t/h would result in long-term underloading.
Q4 Which is more cost-effective: a dual-line or a single-line configuration?
At the 1,600 t/h scale, a "single-line" configuration is not feasible for the primary crushing stage. A dual-line setup—using standardized models—allows for maintenance on one line without halting production; while it entails a slightly larger footprint and a more extensive conveyor system, it is the standard approach for high-capacity projects.
Q5 With an installed capacity of 3,700 kW, what is the approximate electricity consumption per tonne?
Estimating based on an 85% load factor: (3,700 + 370 auxiliary) × 0.85 &pide; 1,600 ≈ 2.16 kWh/t. Actual figures will fluctuate depending on raw ore particle size, the ratio of finished product grades, and the oversize rate.
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