Complete Stone Crushing Plant Design: Layout, Equipment & Cost
A crushing plant is not a collection of machines; it is a chain in which the weakest link sets the output. Two plants with identical equipment lists can differ by 30% in cost per ton depending on how the stages are balanced, how the material is fed and how much surge capacity sits between the crushers.
This guide covers the design decisions for a 50-500 t/h aggregate plant: product definition, flowsheet selection, capacity balance, equipment selection, layout, electrical and dust systems, and cost structure. It ends with a worked 300 t/h limestone example and a commissioning checklist.
Step 1 - Define the product before the plant
Design starts with what you sell, not with what you own. Write down:
- Fractions: 0-5, 5-10, 10-20, 20-40 mm, or a single 0-40 mm product.
- Quality limits: flakiness index, fines content, clay content, washed or dry.
- Target tonnage per shift and per year, and the peak demand you must cover.
- Site constraints: available area, slope, power supply, water, transport distance to market.
A plant that must deliver four fractions needs more screening area and more stockpile conveyors than one producing a single 0-40 mm product. Deciding this later is the most expensive mistake in plant design.
Step 2 - Choose the flowsheet
The flowsheet follows from the rock and the product.
- Soft to medium rock (limestone, dolomite): two stages are usually enough - jaw plus impact or cone, with a closed-circuit screen. Capital cost and wear cost are both lower.
- Hard abrasive rock (granite, basalt, river stone): plan three stages - jaw, secondary cone, tertiary cone (or VSI for sand). Impact crushers are the wrong choice in this duty.
- Sand production: add a VSI and a DXS wheel washer, and expect a wet process with settling ponds.
- Sticky, clay-rich feed: add a grizzly scalper ahead of the jaw and consider a washing screen before the secondary stage.
Dry processing is always cheaper to run than wet processing, so only add water where the specification demands it.
Step 3 - Balance the capacity at every stage
Every stage must be sized for the material that actually flows through it, including the recirculating load.
| Stage | Rule of thumb | Example for 300 t/h finished product |
|---|---|---|
| Feeder | 1.2 x plant output | 360 t/h |
| Primary crusher | 1.3 x plant output | 390 t/h |
| Secondary screen | 1.3-1.5 x secondary feed | 420-480 t/h |
| Secondary crusher | 1.2 x finished output + recirculation | 360-400 t/h |
| Tertiary crusher | 1.2 x the fraction it produces | 240-280 t/h |
| Final screens | 1.3 x each fraction | 400 t/h total area |
Two rules prevent most upgrading projects: never size a crusher on the plant’s nameplate output, and never size a conveyor on the finished-product tonnage - it carries the recirculating load too.
Step 4 - Select equipment stage by stage
| Plant capacity | Feeder | Primary | Secondary | Tertiary | Screens |
|---|---|---|---|---|---|
| 50-100 t/h | ZSW-380x96 | PE-400x600 / PE-500x750 | PF-1010 / PYB-1200 | VSI-7611 (sand) | 2YK-1548 |
| 100-200 t/h | ZSW-490x110 | PE-600x900 / PE-750x1060 | GP-100 / HP-200 | GP-100 / VSI-8518 | 2YK-1854 |
| 200-400 t/h | ZSW-600x130 | PE-900x1200 / C110 | GP-200 / HP-300 | GP-200 / HP-200 | 3YK-2160 |
| 400-800 t/h | ZSW-600x150 | PE-1200x1500 / C160 | GP-300 / HP-400 | HP-300 / VSI-9526 | 3YK-2460 |
Selection notes that matter more than the table:
- Feeders must be wider than the crusher feed opening and long enough to scalp fines.
- Jaw crushers are chosen on the largest lump, not average size (feed opening x 0.8).
- Cone crushers are chosen on the cavity that matches the feed: coarse for 150-250 mm, medium for 40-150 mm, fine or short head below 40 mm.
- Screens are the most under-sized item in most plants; use 1.3-1.5 times the throughput and prefer triple-deck units in the final stage.
- Conveyors should be specified with a 20-30% capacity margin for the recirculating load.
Step 5 - Design the layout for maintenance
Layout decides downtime, not just cost.
- Keep gravity on your side: use the site slope so that material drops from stage to stage, and keep conveyor transfers to a minimum.
- Provide surge capacity between primary and secondary (a live stockpile or bin of 15-30 minutes of plant output).
- Leave service access around the jaw and cone: liner change needs a crane or a forklift, and the plates weigh 200-800 kg.
- Keep wet and dry streams separate: washed sand and dry aggregate must not share conveyors or stockpile areas.
- Design drainage and sumps for the whole pad - water and fines destroy access roads and foundations.
- Put the control room where the operator can see the primary feed, the secondary crusher and the final screens.
Step 6 - Electrical, automation and dust
- Power: allow 1.15-1.25 x the installed motor power for the transformer, and remember that a jaw crusher starting on a loaded cavity draws far more than its rated current.
- Start-up sequence: conveyors, then screens, then crushers, then feeder; shut down in the opposite order. Interlocks that stop the feeder when the secondary crusher trips save more money than any optimization.
- Automation: cone crushers with automatic CSS and power-draw control hold product size and reduce liner cost; a simple PLC with level sensors on the bins is enough for most plants.
- Dust suppression: water sprays at transfer points plus covers on conveyors; for crushers, a misting system at the discharge. Design the spray water so that the product moisture stays within specification.
- Weighing: one belt scale on the finished product is enough for production reporting and for checking the plant balance.
Step 7 - Understand the cost structure
Typical capex split for a 200-400 t/h two-stage aggregate plant:
| Item | Share of capital | Notes |
|---|---|---|
| Crushing and screening equipment | 45-55% | Crushers, screens, feeders |
| Conveyors and steel structure | 15-20% | Length and height drive this |
| Civils and foundations | 10-15% | Site-dependent |
| Electrical and control | 8-12% | Transformer, panels, cables |
| Dust suppression, lighting, misc. | 3-5% | Often forgotten in budget |
| Installation and commissioning | 5-8% | Local labour reduces this |
Operating cost per ton is dominated by wear parts, power and diesel for loaders. On hard rock, liners and jaw plates are usually 20-35% of the total operating cost, which is why the flowsheet (how many times the rock is crushed) matters more than the purchase price of the machines.
Worked example: 300 t/h limestone plant
Requirements: limestone, feed 0-700 mm, products 0-5, 5-10, 10-20 and 20-40 mm, 300 t/h, dry process, capacity to be expanded by 30% later.
- Feeder: ZSW-600x130 grizzly feeder, 360 t/h, scalping fines before the jaw.
- Primary: PE-900x1200 jaw crusher, CSS 90 mm, 160 kW, delivering 0-200 mm at 350-400 t/h.
- Secondary: HP300 multi-cylinder cone, coarse cavity, CSS 25 mm, 220 kW, closed circuit with a 3YK-2160 screen.
- Tertiary: not required for 0-40 mm limestone; the third deck of the final screens returns oversize to the secondary crusher.
- Final screening: 3YK-2460 triple deck producing 0-5, 5-10, 10-20 and 20-40 mm.
- Conveyors: 12 units, all sized with a 25% margin for the recirculating load.
- Power: 400 kW installed, 500 kVA transformer, PLC interlock between the feeder and the secondary crusher.
- Result: 300-330 t/h finished product, four saleable fractions, and a spare space in the flowsheet for a tertiary cone when the market needs more 10-20 mm.
For hard rock equivalents, see the Saudi Arabia 200 t/h granite plant and the Nigeria 250 t/h basalt quarry upgrade; for a sand-focused flowsheet, see the Philippines sand making line.
Commissioning checklist
- Walk the flowsheet before first start: every conveyor must discharge into the next machine’s centre line.
- Check the crusher CSS with a lead-ball test and record it for each machine.
- Run the plant empty first, then at 50% feed for two hours, then at full load.
- Verify the belt scale against a truck weighbridge before trusting production reports.
- Log bearing temperatures and motor currents for the first week; that log becomes your baseline.
- Train the operators on the start-up and shutdown sequence, and on what to do when the secondary crusher trips.
Common mistakes to avoid
- Designing for the average rock size instead of the largest lump.
- Forgetting the recirculating load when sizing screens and conveyors.
- No surge capacity between stages, so the primary crusher stops every time the secondary trips.
- Under-sizing the transformer, then adding a soft starter later.
- Layout with no access for a crane at the cone crusher.
- Budgeting equipment only, and forgetting civils, electrical, dust and installation.
Get a plant design and budget estimate
Send us your material, maximum feed size, target fractions, required t/h and site conditions (power supply, area, water). Our engineers will reply within 24 hours with a flowsheet, an equipment list with motor sizes, a budget estimate and a lead time - free of charge. You can also review the PE series, HP series and VSI sand making machine ranges first.