Soft Rock & C&D Waste Crushing Solution

Limestone, dolomite, sandstone, coal gangue, weathered rock and demolition concrete. Below roughly 150 MPa, one impactor replaces the primary and secondary crushing stages — it takes rebar and asphalt that would stall a cone, and it produces a cubical aggregate in a single pass.

≤150MPa

Upper hardness limit for an impact-only flow

1crusher

Primary and secondary reduction in one pass

80–350TPH

Impact and VSI range across the mobile line

4products

0–5 to 20–31.5 mm, oversize returned

What Runs Through an Impact Flow

Medium-low hardness and low abrasion, with a specification that generally calls for rounder particles. Construction waste is the same story, only mixed with metal.

Limestone Medium hardness

Uniform and easy to reduce — cement raw meal and aggregate, widely distributed.

Dolomite Similar to limestone

Building aggregate and metallurgical flux.

Sandstone, slate, shale Medium-low

Mountain quarries and tunnel spoil, often mixed with soil.

Coal gangue Low

Mine waste, re-used for brick making, backfill and aggregate.

Weathered rock Loose structure

Surface rock that breaks easily; mostly road-base fill.

C&D waste Variable

Concrete blocks, brick, mortar and asphalt — the main urban resource-recovery feed.

One exception worth knowing: red sandstone is soft but silica-rich. It cuts like limestone and wears like granite, so we still put a cone in the second stage — the Hainan project below is that case.

Option 1 · Four finished products

Two Machines Do the Work

An impact plant and a screen. No cone, no third unit, and no foundation under either of them.

SUHMAN SF-380D track-mounted mobile impact crusher

01 · Crushing

SF-380D / SF-580D

Feeder, impact chamber and discharge conveyor on one chassis: primary, secondary and shaping in a single machine. A heavy rotor and high-chrome blow bars do the work by impact, and the hydraulic apron adjustment sets the output curve without opening the housing. A pre-screen in the feeder takes soil and fines out before they can blunt the chamber edge — and before they blind a screen deck in the wet season. Oversize returned from the screen goes back into the chamber for another pass. For demolition feed, the rotor is built against rebar winding and an optional overband magnet pulls steel out before it reaches the screen.

SUHMAN SS-7018 track-mounted mobile screening plant

02 · Sizing

SS-7018 / SSP-6200

The screen is the sizing step of the line. A multi-deck screen cuts the crusher output into four saleable fractions in one pass, each deck discharging to its own stockpile. Decks and mesh are changed to match the specification, and the screen angle is adjusted to balance output split and purity.

The Flow, Step by Step

How Option 1 runs, from the hopper to the stockpiles. For demolition material, two steps are added at the front and in the middle.

01
Pre-sort the feed (C&D only)

Obvious contaminants — rebar, timber, plastic and cable — must be picked out before the feed hopper to prevent blockages in the main crusher.
02
Feed and scalp

The vibrating feeder bypasses soil and fines around the chamber. Clay never reaches the rotor and never reaches the screen deck.
03
Impact crushing

A single pass is all it takes to reduce the feed to the finished size. When crushing demolition concrete, the magnetic separator pulls residual metal out of the recycled aggregate. Material above the target size is returned to the main crusher for re-processing.
04
Sizing

On-spec material from the impact crusher enters the screen, which splits it into up to four product sizes as the project requires. Different sizes only need a change of screen mesh.

Option 2 · Two finished products

One Integrated Unit, Two Stockpiles

Option 1 runs a separate screen because it sells four fractions. Where the market only asks for two, the screen moves onto the crusher chassis: feeding, impact crushing and a two-deck screen share one chassis, two products leave on two belts at the same time, and oversize returns to the chamber — the circuit stays closed without a return conveyor on the ground. The two models below are alternatives rather than a pair: the 380 takes 600 mm at 150–240 TPH, the 580 takes feed over 700 mm and reaches 350 TPH.

SUHMAN SF-380D-S track-mounted integrated crushing and screening plant

SF-380D-S 150–240 TPH · 600 mm feed · 51.4 t View model

SUHMAN SF-580D-S heavy-duty integrated crushing and screening plant

SF-580D-S 150–350 TPH · feed over 700 mm · 59.5 t View model

The two-deck screen ships meshed for the two fractions your market buys — for example 0–5 and 5–20 mm, or 0–20 and 20–40 mm. Tell us the two sizes and the split you need and the unit arrives set for them; the largest product size is normally kept within 150 mm.

Option 3 · Three finished products

Three Sizes from a Single Machine

The same idea with a three-deck module: one pass cuts the output into three finished sizes, each to its own stockpile. For a quarry or a C&D yard selling three grades this replaces the crusher-plus-screen pair entirely — one engine, one operator, one machine to move between sites. A tracked unit of this type went into production the day it arrived at a C&D project in Taizhou, running at around 180 TPH.

SUHMAN SF-380D-2S track-mounted integrated crushing and screening plant with three-deck screen

SF-380D-2S 150–240 TPH · 600 mm feed · 54.3 t View model

The three-deck screen ships meshed for the three fractions your market buys — for example 0–5, 5–20 and 20–40 mm. Tell us the three sizes and the split you need and the unit arrives set for them; the largest product size is normally kept within 150 mm.

Why an Impactor Instead of a Cone

Four arguments, and the fourth is the one that usually decides the purchase.

Two stages in one machine

A cone needs a primary crusher ahead of it. An impactor takes the run-of-yard material and delivers a finished product, so there is one chassis, one engine, one operator and one maintenance schedule.

Shape without a VSI

Impact breakage produces cubical particles with low flake content. On limestone and recycled concrete that is enough to meet the spec, so the cost of a shaping stage disappears.

Rebar and asphalt pass through

A squeeze chamber stops on unbreakable steel. An impact chamber lets it through. For demolition work that difference decides whether the plant runs or the crew digs it out.

Relocation is a working day

No foundation, no civils, tracked undercarriage. On urban demolition the plant follows the building rather than the material being trucked across the city to a fixed line.

Models Used in This Flow

Impactors cover the main duty. A VSI is added only when the specification asks for manufactured sand or a flakiness limit the impactor cannot hold.

Stage	Models	Capacity	Duty
Mobile impact crusher	SF-380D · SF-380D-2S · SF-580D · SF-580D-S	150–350 TPH	Primary and secondary in one pass
Mobile VSI	SC-85D	80–260 TPH	Shaping and manufactured sand
Mobile screening plant	SS-7018 · SSP-6200 · SZ-450D	200–500 TPH	Screening into different product sizes

The -S suffix is the integrated version: crusher and screen on one chassis, which suits demolition sites where space is the constraint.

See full specifications ›

Projects Running on This Flow

Six references, four of them construction and demolition waste — the duty this flow was built around.

HainanLimestone quarryImpact + screen, closed circuit
HubeiBluestone, mine reclamationImpact + screen, closed circuit
HainanRed sandstone quarryJaw + cone + screen — high-silica exception
ZhejiangC&D waste processingImpact + screen, magnet
ShaanxiDemolition wasteImpact + screen, magnet
GansuC&D waste processingImpact + screen, magnet

The red sandstone line is the exception that proves the rule: soft rock, high silica, so the wear argument wins over the one-machine argument.

Soft Rock & C&D Questions We Get Asked

The four that come up in almost every enquiry of this type.

Can the impactor handle reinforced concrete?

Yes, with the right rotor and a magnet. The chamber passes rebar rather than wrapping it, and the overband magnet removes steel before the screen. Without the magnet the steel ends up in the recycled aggregate, which is where the quality problem starts.

What about wet, sticky feed?

Scalp it first. The impactor tolerates sticky material far better than a cone, but neither the chamber nor the screen likes clay. Bypassing fines at the feeder is what keeps a line running through the rainy season.

Can I produce manufactured sand with this flow?

Only by adding a VSI. An impactor makes a cubical aggregate but not a controlled sand grading; the VSI plant re-shapes the 5–20 mm fraction and produces 0–5 mm to a sand specification.

Is an impactor cheaper to run than a cone?

On limestone and demolition waste, yes — fewer machines, less fuel per ton, and blow-bar changes are predictable. On abrasive rock it is the opposite, which is why granite and basalt belong to the hard rock flow.

Send the Material and the Product Mix

Rock type or waste stream, maximum lump size, the fractions you need to sell and the destination. We will answer with a configuration, the magnet option and the wear-parts list.

Get a Soft Rock Configuration