Crushing and Screening Equipment for Mineral and Chemical Processing-Wuxi Xinyang

What Is Crushing?

Crushing is the size reduction of bulk solid materials (rocks, ores, minerals, chemicals) by mechanical force. The crushing force may be compression (jaw crusher, cone crusher), impact (impact crusher, hammer crusher), attrition (roller crusher), or a combination.

Crushing is typically the first step in a size reduction process. The product of crushing is then ground in a ball mill, jet mill, or other mill to achieve the final particle size.

The Xinyang ebong roller screening product line covers crushing and screening equipment for industrial applications.

What Is Screening?

Screening is the separation of particles by size using a screen with specific apertures. The particles larger than the apertures (oversize) are retained on the screen; the particles smaller than the apertures (undersize) pass through.

Screening is used for:

Classifying crushed product by size.

Removing oversize from feed before grinding.

Removing fines from product before packaging.

Dewatering (with dewatering screens).

What Are the Main Crusher Types?

Crusher Type	Crushing Force	Best For	Limitations
Jaw crusher	Compression	Primary crushing, hard and abrasive materials	Limited reduction ratio (4–8:1)
Cone crusher	Compression	Secondary and tertiary crushing, hard materials	Limited to hard materials
Gyratory crusher	Compression	Primary crushing, very large capacity	High capital cost
Impact crusher	Impact	Secondary crushing, medium-hard materials	High wear with abrasive materials
Hammer crusher	Impact	Tertiary crushing, brittle materials	Not suitable for hard or abrasive materials
Roller crusher	Compression/attrition	Crushing of medium-hard materials, controlled reduction	Limited capacity
Dual-roller crusher	Compression/attrition	Crushing of coal, salt, fertilizer, limestone	Limited capacity
Cage mill	Impact	Fine crushing, soft materials	Limited capacity

The selection depends on the feed size, the product size, the capacity, the abrasiveness, and the moisture content.

When Is a Jaw Crusher the Right Choice?

A jaw crusher is the right choice when:

Primary crushing: reducing the size of large rocks or ores from 1 m to 100–200 mm.

Hard and abrasive materials: granite, basalt, hard ore.

High capacity required: 100–10,000 t/h.

Simple and reliable operation: low maintenance requirements.

Jaw crushers use a fixed jaw and a moving jaw to compress the material. The reduction ratio is 4–8:1, meaning the product is 4–8 times smaller than the feed.

When Is a Cone Crusher the Right Choice?

A cone crusher is the right choice when:

Secondary or tertiary crushing: reducing the size from 100–200 mm to 10–50 mm.

Hard materials: granite, basalt, hard ore.

High capacity required: 100–5,000 t/h.

Narrow product size distribution: important for downstream grinding.

Cone crushers use a cone that gyrates inside a concave to compress the material. The reduction ratio is higher than jaw crushers (up to 10:1).

When Is an Impact Crusher the Right Choice?

An impact crusher is the right choice when:

Secondary crushing: reducing the size from 100–200 mm to 10–50 mm.

Medium-hard materials: limestone, dolomite, sandstone.

Sharp, angular product: ideal for concrete aggregate.

Lower capacity required: 50–1,000 t/h.

Impact crushers use a rotor with hammers or bars to impact the material. The product is more angular and has more fines than cone crushers.

When Is a Hammer Crusher the Right Choice?

A hammer crusher is the right choice when:

Tertiary crushing: reducing the size from 50–100 mm to 5–25 mm.

Brittle materials: coal, salt, limestone, gypsum.

Moderate capacity required: 10–500 t/h.

High reduction ratio required: 10–25:1.

Hammer crushers use a rotor with hammers that impact the material. The product is fine and uniform.

When Is a Roller Crusher the Right Choice?

A roller crusher is the right choice when:

Controlled reduction: producing a specific product size with narrow PSD.

Medium-hard materials: coal, salt, fertilizer, limestone, clinker.

Moderate capacity required: 5–500 t/h.

Low fines production required: the product has fewer fines than impact crushers.

The Xinyang dual power grinding machine and related equipment cover roller crushing applications.

What Are the Main Screener Types?

Screener Type	Motion	Best For	Limitations
Vibrating screen	Linear or circular vibration	General purpose, coarse to fine screening	Limited to dry materials
Gyratory screen	Circular motion	Fine screening, dewatering	Limited capacity
Roller screen (trommel)	Rotating cylinder	Coarse screening, washing	Limited to coarse apertures
Banana screen	Multi-slope vibrating	High capacity, fine screening	High capital cost
Horizontal screen	Linear vibration	Dewatering, fine screening	Limited capacity
Flip-flow screen	Vibration with flexible screen panels	Fine screening, difficult materials	High capital cost, limited life

The selection depends on the feed size, the product size, the capacity, the moisture content, and the material properties.

What Are the Common Screen Apertures?

The common screen apertures (in mm or mesh) are:

Aperture (mm)	Mesh (US Standard)	Application
100	—	Coarse screening, primary crusher product
50	—	Secondary crusher product
25	—	Tertiary crusher product
10	—	Coarse grinding product
5	—	Fine grinding product
1	18	Classification
0.5	35	Fine classification
0.25	60	Very fine classification
0.1	140	Ultrafine classification (specialty screens)

For industrial screening, the most common apertures are 0.5–25 mm.

How Is Crushing Capacity Calculated?

Crushing capacity depends on:

Feed size: the maximum size of the feed material.

Product size: the maximum size of the product material.

Crusher type: jaw, cone, impact, hammer, roller.

Material properties: hardness, abrasiveness, moisture.

Crusher setting: the closed-side setting (CSS) or open-side setting (OSS).

The capacity is typically calculated from the crusher manufacturer's data and adjusted for the specific material and operating conditions.

What Are the Common Operating Issues?

Common operating issues in crushers and screeners:

Issue	Cause	Prevention
Excessive wear	Abrasive feed, wrong crusher type	Match crusher to material, use wear-resistant liners
Blocked crusher	Oversized feed, wet material	Pre-screen feed, dry material
Blocked screen	Wet material, near-size particles	Use anti-blinding screens, control feed rate
Low capacity	Wrong equipment, poor maintenance	Select right equipment, maintain equipment
High fines	Wrong crusher, excessive reduction	Use right crusher, control reduction ratio
Noise	High impact, hard material	Use sound dampening, maintain equipment
Vibration	Imbalanced rotor, worn bearings	Balance rotor, replace bearings
Dust	Dry material, high air flow	Use dust collection, wet suppression

Each issue is preventable with discipline. For production crushers and screeners, monitoring and preventive maintenance are standard.

How Is Crushing Cost Calculated?

Crushing cost is the sum of:

Capital cost: the purchase price of the crusher and screener.

Installation cost: foundation, electrical, dust collection.

Energy cost: the ongoing electricity cost.

Wear part cost: jaw plates, cone liners, hammers, screens, which are replaced periodically.

For a large primary crusher, the operating cost is dominated by wear parts. For a secondary crusher, the operating cost is dominated by energy and wear parts.

How Is the Crushing Process Optimized?

The crushing process is optimized by:

Crushing stage selection: select the right combination of primary, secondary, and tertiary crushers.

Crusher setting optimization: optimize the CSS or OSS for the target product size.

Screen optimization: optimize the screen aperture for the target classification.

Circulating load optimization: optimize the circulating load between crusher and screen.

Energy optimization: minimize the specific energy consumption.

Wear part optimization: extend the wear part life by proper operating conditions.

The optimized crushing process is documented in a standard operating procedure (SOP).

What Are the Typical Applications?

Application	Crusher Type	Screener Type
Mining (copper, iron, gold ore)	Jaw + Cone + Screening	Vibrating screen
Aggregate (limestone, granite)	Jaw + Impact + Screening	Vibrating screen
Coal preparation	Jaw + Roller + Screening	Vibrating screen
Cement	Jaw + Hammer + Screening	Vibrating screen
Fertilizer	Roller + Screening	Vibrating screen
Recycling (concrete, asphalt)	Jaw + Impact + Screening	Vibrating screen
Chemical processing	Roller + Hammer + Screening	Vibrating screen
Food processing	Roller + Hammer + Screening	Vibrating screen, gyratory screen

For each application, the equipment selection depends on the material properties, the target product size, and the capacity.

What Is the Future of Crushing and Screening?

Trends in crushing and screening:

Mobile crushers: track-mounted crushers for on-site applications.

Intelligent crushers: crushers with sensors and AI-based optimization.

Energy efficiency: more efficient crushers with lower specific energy.

Wear-resistant materials: longer-lasting wear parts with better materials.

Hybrid crushers: combined compression-impact crushers.

For a manufacturer of crushing and screening equipment, the trend is toward more efficient equipment with better control and lower operating cost.

Conclusion

Crushing and screening equipment is essential for size reduction and classification of bulk solid materials. The main crusher types — jaw, cone, impact, hammer, and roller — each have different strengths. The main screener types — vibrating, gyratory, and roller — each have different applications. The selection depends on the feed size, the product size, the capacity, the abrasiveness, the moisture content, and the cost. Xinyang's ebong roller screening, ball mill, jet mill, and dual power grinding machine product lines cover the full range of crushing, grinding, and screening equipment.

Frequently Asked Questions

What is the difference between a jaw crusher and a cone crusher?

A jaw crusher uses compression between a fixed and moving jaw for primary crushing. A cone crusher uses compression between a gyrating cone and a concave for secondary and tertiary crushing. Cone crushers have higher reduction ratios.

What is the difference between a cone crusher and an impact crusher?

A cone crusher uses compression for crushing; an impact crusher uses impact. Cone crushers produce more cubical product; impact crushers produce more angular product.

What is the difference between a hammer crusher and an impact crusher?

A hammer crusher uses hammers attached to a rotor for crushing; an impact crusher uses bars or blow bars. Both use impact, but the geometry and application are different. Hammer crushers are typically for tertiary crushing of brittle materials; impact crushers are for secondary crushing of medium-hard materials.

What is the typical reduction ratio for each crusher?

Jaw crusher: 4–8:1. Cone crusher: 5–10:1. Impact crusher: 10–20:1. Hammer crusher: 10–25:1. Roller crusher: 2–4:1.

What is the typical capacity of a jaw crusher?

Jaw crushers range from 1 t/h (laboratory) to 10,000 t/h (large primary). The exact capacity depends on the feed size, the crusher setting, and the material.

What is the typical wear part life for a crusher?

Wear part life depends on the material and the operating conditions. For abrasive materials, wear parts may be replaced weekly; for mild materials, monthly or quarterly.

How is the product size controlled?

The product size is controlled by the crusher setting (CSS or OSS), the feed rate, and the screen aperture. The product size is measured by sieve analysis.

What is the typical screen aperture range?

Industrial screens typically have apertures of 0.5–25 mm. For finer screens, special screens (e.g., flip-flow) are used.

How is screen blinding prevented?

Screen blinding is prevented by using anti-blinding devices (balls, brushes, ultrasonic), by using the right screen type (e.g., flip-flow for difficult materials), and by controlling the feed rate.

What safety precautions are needed for crushing equipment?

Safety precautions include guarding the moving parts, lockout/tagout for maintenance, dust collection for dry materials, noise protection, and PPE.

What is the future of crushing equipment?

The future is toward mobile crushers, intelligent crushers with sensors and AI, energy-efficient crushers, wear-resistant materials, and hybrid crushers.

Can crushing equipment be used for both mineral and chemical processing?

Yes, crushing equipment is used for both. The selection depends on the material properties (hardness, abrasiveness, moisture) and the target product size.