Controlled crushing of mineral raw materials.
Roll crushers and sizers for ore, coal and overburden – tailored to your material, target particle size and throughput.
Extraction provides the raw material. Processing prepares it for the next step. The crusher performs a clearly defined task within the process chain.
Mining and handling produce material of different sizes and compositions.
Roll crushers or sizers reduce the material to the required particle size.
Screening and other processes separate the material according to process requirements.
The defined particle size supports transport, separation or production.
Schematic process sequence: the order and extent of processing depend on the raw material and the plant concept. Crushing and classification may be combined in several stages.
Each machine is designed for a specific task. These examples show how feed size, product size and material properties interact.
▶ Watch the magnetite field testThe magnetite test used the CST 771 mobile plant fitted with a toothed roll crushing unit from the DRC series. The aim was a coarse product with a low fines content.
The Sizer 800 was designed for clay-rich overburden containing hard granite inclusions. The crushing task reduces large lumps to a size suitable for transport.
Three DRC 450-15 crushers were delivered for hard coal processing. The report describes gentle crushing with a high proportion of coarse particles and a low fines content.
The figures are taken from the linked reports. They describe different tests and projects; the achievable performance in another application is determined from its material and process data.
Primary crushing starts with coarse feed material. When processing overburden, producing a particle size suitable for transport may itself be the key task.
The Sizer 800 described here combines a synchronised drive with a pick system whose tool heads can be installed and removed without welding.
The material name alone is not enough to select a crusher. The actual feed material and the product requirements are decisive.
| Design parameter | What it means for the crushing task |
|---|---|
| Feed size & lump shape | Particle size distribution, maximum lump dimension and lump shape determine the requirements for material intake and the crushing chamber. |
| Target size & fines content | The required particle size range, permitted oversize and fines content define the crushing target. |
| Throughput | The required capacity in t/h must be considered together with the material feed and the reduction ratio. |
| Strength & abrasiveness | Compressive strength and abrasive wear are different properties. Both influence the design of the machine and its tools. |
| Moisture & sticky components | Loam, clay and adhering material place additional demands on the crushing chamber and material flow. |
| Plant integration | Feeding equipment, downstream conveying, installation space and maintenance access are part of planning the entire crushing stage. |
Primary, secondary and tertiary crushing describe the position in the process. The number of stages required depends on the feed size and the desired product.
Roll crushers reduce material between rotating rolls. Tool geometry, crushing gap and drive are matched to the specific task.
The published applications range from coal to the magnetite test with high compressive strength. They demonstrate why material data and practical tests matter when selecting a crusher.
More about C&S roll crusher technology →
Crushing technology for coarse feed, high throughputs and demanding rock types.
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Explore coal processing →Processing mineral raw materials in a quarry? Further applications: Limestone and marble · Gypsum.
Mineral processing covers the steps that prepare extracted material for further use. These may include crushing, classification and separation of different components. The processes required depend on the raw material and the desired product.
The primary crusher handles the first crushing step for the feed material. A secondary crusher further reduces material that has already been crushed. A tertiary stage may be needed if the previous stages do not achieve the target particle size.
Yes, with the appropriate design. In the published magnetite test, the CST 771 with a DRC toothed roll crushing unit processed material with compressive strength up to 300 MPa. Feed material of 0–300 mm was reduced to a product of 0–80 mm. Suitability for another ore must be assessed using its properties.
Fines alter the particle size distribution of the product. Whether they are desirable or should be limited depends on the next process stage. In the published magnetite and hard coal applications, low fines content and a high proportion of coarse particles were important targets.
This mixture requires a design that can handle both adhering components and hard lumps. In the Sizer 800 project, clay-rich overburden with granite inclusions was specified for a transportable product size of 250 mm. The precise solution depends on composition, moisture and feed size.
Useful information includes material type and composition, feed size including maximum lump dimension, target product size and throughput. Available data on compressive strength, abrasiveness, moisture and sticky components complete the picture. The feeding arrangement and plant integration should also be described.
Tell us about your crushing task. Together, we will consider the material properties, target particle size and integration into your process.