Spiral Classifier

Motor Power

1.1-15KW

Capacity

6-400tph

Process Material: Natural sand, artificial sand, manufactured sand and various metal ores

Type: Single spiral classifier, double spiral classifier

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What is Spiral Classifier?

◎Zhongxin Heavy Industry is a professional Chinese manufacturer and supplier of spiral classifiers, specializing in reliable mineral processing equipment for mining, sand washing, and ore beneficiation applications. Our Spiral Classifier, also known as a screw classifier, is designed for efficient particle size classification and is widely used in grinding and beneficiation circuits.

◎The spiral classifier works according to the differences in specific gravity and settling velocity of solid particles in water. During operation, coarse and heavy particles settle quickly and are conveyed back for further grinding, while fine particles remain suspended and overflow with the slurry. When paired with a ball mill, the spiral classifier forms an efficient closed-circuit grinding system, improving grinding efficiency and reducing over-grinding.

◎The equipment features a simple and robust structure, reliable operation, large processing capacity, stable classification conditions, and high classification efficiency. With convenient operation and low maintenance requirements, the spiral classifier provides an economical and dependable solution for mineral processing plants.

What is the working principle of the Spiral Classifier?

The Spiral Classifier separates mineral particles according to differences in particle size, specific gravity, and settling velocity in a liquid medium. It combines gravity sedimentation with continuous spiral conveying to achieve efficient coarse and fine particle classification.

◎1. Slurry Feeding:
Mixed ore slurry enters the settlement pool in the middle of the inclined tank, where particles begin to separate under suitable flow conditions.

◎2. Gravity Sedimentation:
Larger and heavier particles quickly settle to the bottom, forming coarse sand, while finer and lighter particles remain suspended in the upper water layer and move toward the overflow zone.

◎3. Spiral Lifting & Dewatering:
The rotating spiral blades continuously lift settled coarse particles upward along the inclined tank. Water drains back into the pool during conveying, while the coarse material is discharged through the sand outlet and typically returned to the ball mill for re-grinding.

◎4. Fine Particle Overflow:
Fine particles flow toward the lower end and pass over the overflow weir into the next processing stage, such as flotation or gravity concentration.

This continuous classification process provides stable separation and efficient coarse material return for closed-circuit grinding and mineral processing plants.

High-capacity Spiral Classifier for gold ore processing plants

Type	Model	Spiral Diameter (mm)	Speed (r/min)	Tank	Capacity (t/24h)	Motor Power (kW)	Lifting Motor Power (kW)
FG High Weir Spiral Classifier	FG-5	Φ500	9.2	3900	560	10.5°-14°	21-75	145-260	3	0
FG-7	Φ750	7.8	5367	830	10.5°-14°	65-154	255-564	3	0
FG-10	Φ1000	7	6500	1110	10.5°-14°	85	473-1026	5.5	0
FG-12	Φ1200	5, 6, 7	6500	1372	10.5°-14°	150	1145-1600	5.5	2.2
FG-15	Φ1500	2.5, 4, 6	8265	1664	14°-18.5°	235	1140-2740	7.5	2.2
FG-20	Φ2000	5.4	8400	2396	14.5°-18.5°	400	5940	15	2.2
FG-24	Φ2400	3.6, 5.4, 6.3	9160	2600	14°-18.5°	580	6800	11/15	2.2
FG-30	Φ3000	3.17	12500	3200	14°-18.5°	890	11650	22	4
2FG-12	Φ1200	5, 6, 7	6500	2620	14°-10.5°	300	2290-3200	5.5*2	2.2* 2
2FG-15	Φ1500	2.5, 4, 6	8265	3200	14°-18.5°	460	2240-5360	7.5*2	2.2*2
2FG-20	Φ2000	5.4	8400	4296	14.5°-18.5°	800	11880	15*2	2.2*2
2FG-24	Φ2400	3.6, 5.4, 6.3	9160	5040	14°-18.5°	1160	13600	112 / 152	2.2*2
2FG-30	Φ3000	3.17	12500	6300	14°-18.5°	1785	23300	22*2	4*2
FC Submerged Spiral Classifier	FC-10	Φ1000	6-7.4	6500	1110	10.5°-14°	75	473-1026	5.5	0
FC-12	Φ1200	5, 6, 7	8400	1372	10.5°-14°	120	1145-1600	5.5	2.2
FC-15	Φ1500	2.5, 4, 6	10500	1664	14°-18.5°	185	1140-2740	7.5	2.2
FC-20	Φ2000	5.4	12800	2396	14.5°-18.5°	400	5940	15	2.2
FC-24	Φ2400	3.6	11130	2600	14°-18.5°	455	6800	11/15	2.2
FC-30	Φ3000	3.2	14300	3200	14°-18.5°	705	11650	22	4
2FC-12	Φ1200	6	8400	2620	14°-10.5°	240	1770-2800	7.5*2	2.2*2
2FC-15	Φ1500	2.5, 4, 6	10500	3200	14°-18.5°	370	2240-5360	7.5*2	2.2*2
2FC-20	Φ2000	5.4	12800	4280	14.5°-18.5°	640	7780-11880	18.5*2	2.2*2
2FC-24	Φ2400	3.6	11160	5040	14°-18.5°	910	13700	18.5*2	2.2*2
2FC-30	Φ3000	3.17	14300	6300	14°-18.5°	1410	23300	30*2	4*2

Type

Model

Spiral
Diameter
(mm)

Speed
(r/min)

Tank

Capacity
(t/24h)

Motor
Power
(kW)

Lifting
Motor
Power
(kW)

Length
(mm)

Width
(mm)

Inclination
Angle

Overflow
Rate

Sand
Return

FG High Weir Spiral Classifier

FG-5

Φ500

9.2

3900

560

10.5°-14°

21-75

145-260

FG-7

Φ750

7.8

5367

830

10.5°-14°

65-154

255-564

FG-10

Φ1000

6500

1110

10.5°-14°

473-1026

5.5

FG-12

Φ1200

5, 6, 7

6500

1372

10.5°-14°

150

1145-1600

5.5

2.2

FG-15

Φ1500

2.5, 4, 6

8265

1664

14°-18.5°

235

1140-2740

7.5

2.2

FG-20

Φ2000

5.4

8400

2396

14.5°-18.5°

400

5940

2.2

FG-24

Φ2400

3.6, 5.4, 6.3

9160

2600

14°-18.5°

580

6800

11/15

2.2

FG-30

Φ3000

3.17

12500

3200

14°-18.5°

890

11650

2FG-12

Φ1200

5, 6, 7

6500

2620

14°-10.5°

300

2290-3200

5.5*2

2.2* 2

2FG-15

Φ1500

2.5, 4, 6

8265

3200

14°-18.5°

460

2240-5360

7.5*2

2.2*2

2FG-20

Φ2000

5.4

8400

4296

14.5°-18.5°

800

11880

15*2

2.2*2

2FG-24

Φ2400

3.6, 5.4, 6.3

9160

5040

14°-18.5°

1160

13600

11*2 / 15*2

2.2*2

2FG-30

Φ3000

3.17

12500

6300

14°-18.5°

1785

23300

22*2

4*2

FC Submerged Spiral Classifier

FC-10

Φ1000

6-7.4

6500

1110

10.5°-14°

473-1026

5.5

FC-12

Φ1200

5, 6, 7

8400

1372

10.5°-14°

120

1145-1600

5.5

2.2

FC-15

Φ1500

2.5, 4, 6

10500

1664

14°-18.5°

185

1140-2740

7.5

2.2

FC-20

Φ2000

5.4

12800

2396

14.5°-18.5°

400

5940

2.2

FC-24

Φ2400

3.6

11130

2600

14°-18.5°

455

6800

11/15

2.2

FC-30

Φ3000

3.2

14300

3200

14°-18.5°

705

11650

2FC-12

Φ1200

8400

2620

14°-10.5°

240

1770-2800

7.5*2

2.2*2

2FC-15

Φ1500

2.5, 4, 6

10500

3200

14°-18.5°

370

2240-5360

7.5*2

2.2*2

2FC-20

Φ2000

5.4

12800

4280

14.5°-18.5°

640

7780-11880

18.5*2

2.2*2

2FC-24

Φ2400

3.6

11160

5040

14°-18.5°

910

13700

18.5*2

2.2*2

2FC-30

Φ3000

3.17

14300

6300

14°-18.5°

1410

23300

30*2

4*2

Common Problems

This section is designed to address the most pressing inquiries customers may have regarding the daily operation, maintenance, product advantages, and after-sales service of our machine. Our aim is to help you gain a comprehensive understanding of our overall capabilities and enable you to make informed decisions for your projects.

It operates on the principle of settling velocity. In a liquid medium, solid particles of different sizes and specific gravities settle at different rates. Heavy, coarse particles sink to the bottom of the inclined tank and are pushed upward by the rotating spiral to the discharge port for re-grinding, while lighter, fine particles float and flow out via the overflow weir.

A high-weir classifier is suitable for coarse classification (greater than 0.15mm), while a submerged classifier, with its spiral section fully immersed in the slurry, is suitable for fine classification (less than 0.15mm).

The spiral classifier price depends heavily on the spiral diameter, screw quantity (single or double), weir type (high weir or submerged), and specific lining materials. Contact Zhongxin engineering team to get a detailed customized technical solution and factory-direct quotation.

Yes, it is usually connected to the ball mill via gravity drop to form a closed loop, automatically sending unqualified coarse material back for regrinding.

The primary difference lies in the height of the overflow weir relative to the spiral shaft: High Weir Type: The overflow weir is higher than the lower bearing of the spiral shaft but lower than the upper edge of the spiral at the overflow end. It is ideal for separating coarse particles, typically used for classifying particles with a size greater than 0.15mm. Submerged Type: The spiral at the overflow end is completely submerged beneath the liquid level. This provides a larger, more stable settlement area, making it perfect for fine-particle classification, typically for sizes less than 0.15mm (especially down to 0.074mm).

Adjusting the separation size in a screw classifier can be achieved by controlling several key operating parameters: Slurry Concentration: Lowering the feed concentration decreases viscosity, allowing particles to settle faster, which results in a finer overflow product. Feed Velocity: Keeping a stable and uniform feed prevents turbulence in the settlement pool, ensuring precise particle cutting. Weir Height : Raising the weir height increases the settlement pool volume and retention time, leading to a finer overflow.

To minimize wear and tear from abrasive ores, Zhongxin Heavy Industry provides customized wear protection options: High-Manganese Steel / Alloy Liners: Excellent for heavy duty applications with high impact and abrasion. Polyurethane (PU) / Rubber Liners: Highly recommended for wet classification of non-metallic minerals or fine-grain slurry, as they offer superior corrosion resistance and a longer lifespan.

To ensure continuous, stable operation, we recommend the following maintenance checklist: Lubrication: Regularly grease the lower submerged bearing and the upper gearbox. The lower bearing is critical as it operates underwater and must be kept sealed. Lifting Device Inspection: Periodically test the screw lifting mechanism to ensure it can lift the spiral shaft smoothly when the machine stops with load (preventing the spiral from being buried and jammed by settling solids). Wear Inspection: Monitor the thickness of the spiral liner plates and replace them before the wear reaches the main structural spiral flight.

COMPREHENSIVE SERVICE & GENUINE SPARE PARTS

Zhongxin Heavy Industry provides not only high-performance equipment but also full life-cycle support solutions.

Genuine & Wear-Resistant Spiral Classifier Spare Parts

To maintain peak classification efficiency and eliminate costly downtime in your mineral processing plant, utilizing high-quality spiral classifier spare parts is non-negotiable. As an experienced mining equipment manufacturer, we supply a complete inventory of genuine replacement components tailored for all sizes of single and double spiral classifiers (including high-weir and submerged types).

Custom Engineering & Mineral Processing Flowsheet Design

Different minerals—whether you are processing gold quartz ore, copper sulfides, iron ore, or industrial silica sand—require unique classification parameters. We offer custom-tailored spiral classifier design services to match your specific metallurgy goals.

Comprehensive Technical & After-Sales Services

Investing in our mineral spiral classifier means securing a long-term technical partner. We offer end-to-end support to ensure your grinding and classification circuits run at maximum efficiency.

Product Inquiry

Spiral Classifier

Zhongxin Heavy Industry is a leading Chinese spiral classifier factory and supplier, specializing in manufacturing high-performance mineral processing equipment.
Our spiral classifier (also known as screw classifier) is widely used in mining, sand washing, and ore beneficiation plants. It forms a highly efficient closed-circuit grinding system when paired with a ball mill with spiral classifier, returning coarse materials to the mill while discharging qualified fine overflow.
They utilize the principle that solid particles have different specific gravities and different settling velocities in liquids to classify materials by particle size. They are characterized by simple structure, reliable operation, large processing capacity, stable classification zone, and high classification efficiency.

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Spiral Classifier

What is Spiral Classifier?

Heavy-duty structural design

High grading efficiency

Integrated lifting device

Smooth operation

Flexible Overflow Adjustment

What are the features of the Spiral Classifier?

Advantages of Spiral Classifier and Reasons to Choose Us

What is the working principle of the Spiral Classifier?

Product Photos

Specification

RECOMMENDED CRUSHING, SCREENING AND MINERAL PROCESSING EQUIPMENT

EXPLORE MORE PRODUCTION LINE SITE PROJECTS

Common Problems

COMPREHENSIVE SERVICE & GENUINE SPARE PARTS

Genuine & Wear-Resistant Spiral Classifier Spare Parts

Custom Engineering & Mineral Processing Flowsheet Design

Comprehensive Technical & After-Sales Services

Product Inquiry

Our Website

Spiral Classifier

What is Spiral Classifier?

Heavy-duty structural design

High grading efficiency

Integrated lifting device

Smooth operation

Flexible Overflow Adjustment

What are the features of the Spiral Classifier?

Advantages of Spiral Classifier and Reasons to Choose Us

What is the working principle of the Spiral Classifier?

Product Photos

Specification

RECOMMENDED CRUSHING, SCREENING AND MINERAL PROCESSING EQUIPMENT

EXPLORE MORE PRODUCTION LINE SITE PROJECTS

Common Problems

Q1:How does a spiral classifier work in a mineral processing plant?

Q2:What is the difference between a high-weir classifier and a submerged classifier?

Q3:What is the price of a custom industrial spiral classifier?

Q4:Can it be directly linked with a ball mill?

Q5:What is the difference between High Weir and Submerged spiral classifiers?

Q6:How do you adjust the classifying particle size (cut point) during operation?

Q7:What wear-resistant materials are available for the spiral flights?

Q8:What regular maintenance is required for a mining spiral classifier?

COMPREHENSIVE SERVICE & GENUINE SPARE PARTS

Genuine & Wear-Resistant Spiral Classifier Spare Parts

Custom Engineering & Mineral Processing Flowsheet Design

Comprehensive Technical & After-Sales Services

Product Inquiry

Cookies