Dolomite Crushing Production Line (200 TPH Capacity)
Dolomite has a Mohs hardness of 3.5–4, a compressive strength of 60–120 MPa, and low abrasiveness, making it a material suitable for processing with an impact crusher rather than a cone crusher. The standard configuration for a dolomite crushing line with an hourly capacity of 200 tons is: ZSW490×110 grizzly feeder → PE750×1060 jaw crusher (primary crushing) → PF1315 impact crusher (secondary/tertiary crushing) → 4YK2160 four-deck circular vibrating screen (closed-circuit classification). The real pitfalls lie in two areas rather than the main equipment itself: first, nameplate capacities are typically calibrated for limestone, so a correction factor of 0.9 must be applied for dolomite; second, the closed-circuit return flow increases the throughput requirement for the secondary crushing stage from 200 t/h to 235 t/h.
I. Equipment Selection for Dolomite Crushing Lines: Based on Material Characteristics
| Characteristic | Typical Value | Impact on Selection |
|---|---|---|
| Mohs Hardness | 3.5–4 | Higher than calcite (Level 3); impact crusher blow bars can handle it; hammer crushers are also viable but experience slightly higher wear. |
| Compressive Strength | 60–120 MPa | A brittle material of medium-low hardness; two-stage crushing is sufficient to meet standards. |
| Abrasiveness | Low (slightly higher than limestone) | Initial investment for an impact crusher is 30%–40% lower than for a cone crusher, making it the economical choice for this material. |
| Bulk Density | Approx. 1.5–1.6 t/m³ (True density: 2.84) | Close to the limestone benchmark, but still requires a correction factor of 0.85–0.95. |
| SiO₂ Content | Usually <3%; can be higher in associated minerals | If >3%, the lifespan of blow bars and screens is significantly reduced; chemical analysis is required beforehand. |
| End-Product Use | Metallurgical flux, refractories, glass, agricultural soil amendment | Intended use determines screen aperture size and number of decks. |
In short: The feeder, jaw crusher, impact crusher, and four-deck circular vibrating screen are the "essential four"; whether to add a VSI crusher depends on whether the 0–5mm fraction exceeds 30%.
II. Model Determination for a 200 tph Dolomite Crushing Line: Three Calculations
① Primary crushing is determined by the maximum feed size: Jaw crusher feed opening width ≥ Maximum raw ore size &pide; 0.85. For raw ore ≤530mm, select the PE750×1060 (feed opening 750×1060mm, max feed ≤630mm, discharge opening 80–140mm, rated capacity 110–320 t/h, 110 kW). Applying the 0.9 correction factor for dolomite yields 99–288 t/h, placing the requirement comfortably within the operating range.
② The secondary stage is sized based on throughput rather than finished product output: assuming an oversize rate of 15% for the screen, the actual throughput required for the impact crusher is 200 &pide; 0.85 ≈ 235 t/h. The PF1315 model (rotor Φ1320×1500 mm; max feed size ≤350 mm; rated capacity 100–280 t/h; 200 kW) has a dolomite-adjusted capacity of 90–252 t/h; this covers the 235 t/h requirement with a margin of about 7%—meaning it is "sufficient" but not "excessive." If the oversize rate rises to 25%, the required throughput becomes 267 t/h, exceeding the adjusted upper limit; in that case, a switch to the PF1320 model (160–350 t/h) would be mandatory.
③ Screening equipment is likewise selected based on throughput: the 4YK2160 (screen deck 2100×6000 mm; four decks) handles the 235 t/h load, with its four screen decks corresponding precisely to four product grades, thereby eliminating the need for the conveyor belts and electrical control circuits required if two three-deck screens were used in series.
| Process Step | Equipment | Model | Key Parameters (Limestone Calibration) | Power |
|---|---|---|---|---|
| Feeding | Vibrating Grizzly Feeder | ZSW490×110 | Trough: 4900×1100mm; Max. feed size: ≤580mm; 180–400 t/h | 15 kW |
| Primary Crushing | Jaw Crusher | PE750×1060 | Feed opening: 750×1060mm; Discharge opening: 80–140mm; 110–320 t/h | 110 kW |
| Secondary/Fine Crushing | Impact Crusher | PF1315 | Rotor: Φ1320×1500mm; Max. feed size: ≤350mm; 100–280 t/h | 200 kW |
| Screening | 4-Deck Circular Vibrating Screen | 4YK2160 | Screen surface: 2100×6000mm; Mesh sizes: 5/10/20/31.5mm | 30–45 kW |
| Conveying | Belt Conveyor | B800 / B650 | Main flow: B800; Return & finished product: B650 | — |
| Environmental Protection | Pulse-Jet Bag Dust Collector | DMC Series | Specification selected based on number of dust emission points | — |
Total installed power for main equipment is approx. 360 kW; specific energy consumption is approx. 1.2–1.6 kWh/t (estimated); motors are customized for local voltage (380/400/440V) and frequency (50/60Hz).
Dolomite crushing production line
III. Three Easily Overlooked Verification Points
1) Do not omit the material correction factor: Nameplate capacity is calibrated based on limestone (density 1.6 t/m³); for dolomite, a factor of 0.85–0.95 must be applied. Specifying the corrected capacity in the technical agreement helps avoid disputes more effectively than simply citing the nameplate figure.
2) The intended use of the final product determines the number of screen decks: producing concrete aggregates requires four decks to yield four size fractions; producing metallurgical flux often requires a single 10–30 mm fraction, for which three decks suffice—avoiding the unnecessary cost of extra screens and conveyor belts for unused fractions.
3) Closed-circuit material recirculation involves a trade-off between particle shape and equipment load: oversized material is returned to the secondary stage for another impact, reducing the content of needle-like and flaky particles to below 8%, but at the cost of a 15%–20% increase in load on the secondary crusher and screen decks.
IV. FAQ
Q1: Should an impact crusher or a cone crusher be used for dolomite? Can a hammer crusher be used?
A1: Dolomite has low abrasiveness and a compressive strength of 60–120 MPa; an impact crusher is the economical choice, requiring 30%–40% less investment than a cone crusher while producing good particle shape. Hammer crushers can also be used, but they tend to produce excessive fines and require more frequent hammer replacements, meaning the long-term cost per ton may not necessarily be lower. The advantages of cone crushers are best realized with highly abrasive, hard rocks like granite and basalt.
Q2: Is 200 tph the nominal capacity or the actual operating capacity?
A2: The figures in the table are nominal values calibrated for limestone (density: 1.6 t/m³); for dolomite applications, these should be multiplied by a factor of 0.85–0.95. Actual output fluctuates based on raw material gradation, moisture content, and the desired product mix, so a 10%–15% margin should be allowed; acceptance testing should be based on measured continuous hourly output rather than the nameplate rating.
Q3: Why is the secondary stage sized for 235 t/h instead of 200 t/h?
A3: Because of the closed-circuit material recirculation. Assuming an oversize rate of 15% for the screen, the load transferred to the secondary stage and the screen consists of the finished product (200 t/h) plus the recirculating load, totaling approximately 235 t/h (200 &pide; 0.85). If the system is configured strictly for a 200 t/h throughput, operational issues will arise, such as fluctuations in the product pass rate, excessive screen bearing temperatures, and a drastic reduction in blow bar service life.
Q4: What configuration adjustments are needed for high clay content in the raw ore or for operations during the rainy season?
A4: At the feed end, use the grizzly bar section of the ZSW490×110 feeder to bypass fines and soil into a separate stockpile, preventing material clogging in the secondary stage; switch the screen deck to anti-clogging polyurethane mesh. If there are strict requirements for clay content in the final product, install a bucket-wheel sand washer and a fine sand recovery unit downstream of the product conveyor, with overflow water recycled for reuse.
Q5: What provisions should be made now for a future capacity expansion to 300 t/h?
A5: Make provisions in three areas: size the jaw crusher foundation to accommodate a PE900×1200 model; prepare the foundation and electrical control circuits for a second impact crusher in the secondary crushing stage; and allocate space and conveyor connection points within the screening structure for the future installation of a second circular vibrating screen. Do not select a conveyor belt width that is at the absolute limit of its capacity; ensure the B800 belt has sufficient operational margin.
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