鉱山設備ガイド：What Equipment Should You Use for Slurry Classification and Reagent Mixing in Metal Beneficiation Processes? A Complete Guide to High Weir Spiral Classifiers and High-Efficiency Agitation Tanks

The high weir spiral classifier is widely used in the metal beneficiation process to grade slurry by particle size, and can also be used in ore washing operations for desliming and dewatering, often forming a closed-circuit process with ball mills. Its working principle is based on the fact that solid particles settle at different rates in a liquid: fine mineral particles float in the water and overflow, while coarse particles settle at the bottom of the trough and are pushed upwards by the spiral for discharge, achieving mechanical classification. The high-efficiency agitation tank (GBJ type) is an important pulp conditioning device before flotation in the beneficiation process. Its impeller diameter is enlarged, increasing the linear speed and enhancing the mixing capacity of slurry and reagents. The impeller is designed as an umbrella-shaped impeller, enhancing the mixing ability and circulation; the tank has a guide body, with the impeller located inside, further increasing the mixing and circulation of slurry and reagents; the umbrella-shaped impeller exerts a downward pressure during operation, accelerating the slurry suction; a jet body is installed at the bottom of the guide body, further enhancing the circulation of slurry and reagents. Thorough mixing and circulation of slurry and reagents fully condition the mineral surfaces, which is beneficial for flotation. Why choose these two pieces of equipment? First, the high weir spiral classifier has high classification efficiency, effectively controls grinding fineness, and forms a closed-circuit process with the ball mill, improving grinding efficiency; second, the equipment has a simple structure, operates smoothly, is easy to maintain, and is highly adaptable; third, the high-efficiency agitation tank has strong mixing capability, excellent circulation, and can significantly improve flotation indicators; fourth, both are conventional core equipment for beneficiation plants, technically mature, and highly reliable. The high weir spiral classifier is mainly used in metal beneficiation processes for particle size classification of slurry, desliming and dewatering in ore washing, and for forming a closed-circuit process with ball mills; the high-efficiency agitation tank is mainly used for pulp conditioning before flotation, thorough mixing of slurry and reagents, and various stirring processes in beneficiation plants. The people who need these two pieces of equipment include metal beneficiation plants, mining enterprises, EPC contractors for beneficiation equipment, maintenance and replacement procurement teams of beneficiation plants, equipment distributors and stockists, and overseas mining project purchasers. When should these two pieces of equipment be selected or replaced? New beneficiation plants need to be equipped with grinding, classification, and flotation pulp conditioning equipment. The old classifier has low classification efficiency, severely worn spiral blades, or a high failure rate and needs upgrading; the old agitation tank has uneven mixing, high reagent consumption, or poor flotation indicators and needs replacement; a mineral processing process upgrade requires improved grinding fineness control or flotation recovery; export projects require classifiers and agitation tanks compatible with overseas voltage and efficient mineral processing conditions. How to choose a high weir spiral classifier? Step 1: Confirm the processing capacity and classification granularity requirements, and select the corresponding model based on the plant capacity; Step 2: Confirm the number of spirals, single spiral (FG/FC) or double spiral (2FG/2FC); Step 3: Confirm the spiral diameter, choose 300-3000mm according to processing capacity and classification granularity; Step 4: Confirm the tank length and spiral speed, choose according to classification requirements and material characteristics; Step 5: Confirm motor power, including motors for transmission and lifting; Step 6: Confirm the installation foundation, which should be installed on a solid concrete foundation and fixed with anchor bolts. How to choose an efficient agitation tank? Step 1: Confirm the effective volume, choose 0.58-45m³ according to slurry processing capacity and mixing time; Step 2: Confirm the impeller speed and diameter, choose according to slurry concentration and reagent characteristics; Step 3: Confirm the motor model and power, choose 2.2-37kW according to mixing intensity and slurry properties; Step 4: Confirm the installation foundation, which should be installed on a solid concrete foundation and fixed with anchor bolts; Step 5: Confirm the slurry and reagent inlet and outlet pipeline connections to ensure smooth circulation.

High Weir Spiral Classifier Specifications and Performance Parameters Table

Model	Spiral Diameter (mm)	Spiral Speed (r/min)	Tank Length (mm)	Motor Power - Transmission (kW)	Motor Power - Lifting (kW)	Overall Dimensions - Length (mm)	Overall Dimensions - Width (mm)	Overall Dimensions - Height (mm)	Machine Weight (t)
FG-3	300	12-30	3000	1.1	—	3850	490	1140	0.7
FG-5	500	8-12.5	4500	1.1	—	5430	680	1480	1.6
FG-7	750	6-10	5500	3	—	6720	980	1820	2.7
FG-10	1000	5-8	6500	5.5	—	7590	1240	2380	4.0
FC-10	1000	5-8	8400	7.5	—	9600	1240	2680	6.0
FG-12	1200	5-8	6500	7.5	2.2	8180	1570	3110	8.5
FC-12	1200	5-8	8400	7.5	2.2	10370	1540	3920	11.0
2FG-12	1200	5-8	6500	15	4.4	8230	2790	3110	15.8
2FC-12	1200	5-8	8400	15	4.4	10370	2790	3920	17.6
FG-15	1500	4-6	8300	7.5	2.2	10410	1880	4080	12.5
FC-15	1500	4-6	10500	7.5	2.2	12670	1820	4890	16.8
2FG-15	1500	4-6	8300	15	4.4	10410	3390	4080	22.1
2FC-15	1500	4-6	10500	15	4.4	12670	3370	4890	30.7
FG-20	2000	3.6-5.5	8400	11-15	3	10790	2530	4490	20.5
FC-20	2000	3.6-5.5	12900	11-15	3	15610	2530	5340	28.5
2FG-20	2000	3.6-5.5	8400	22-30	6	11000	4600	4490	35.5
2FC-20	2000	3.6-5.5	12900	22-30	6	15760	4600	5640	48.7
FG-24	2400	3.67	9130	15	3	11650	2910	4970	25.7
FC-24	2400	3.67	14130	18-5	4	16580	2930	7190	41.0
2FG-24	2400	3.67	9130	30	6	12710	5430	5690	45.8
2FC-24	2400	3.67	14130	37	8	17710	5430	8000	67.9
2FG-30	3000	3.2	12500	40	8	16020	6640	6350	73.0
2FC-30	3000	3.2	14300	—	—	17091	—	8680	84.8

Efficient Agitation Tank Specifications and Performance Parameters Table

Model	Effective Volume (m³)	Impeller Speed (r.p.m)	Impeller Diameter (mm)	Motor Model	Motor Power (kW)	Weight (t)
GBJ-1000×1000	0.58	530	350	Y112M-6	2.2	0.79
GBJ-1250×1250	1.15	350	240	Y100L-4	3	1.1
GBJ-1500×1500	2.2	320	420	Y132M-6	5.5	2.2
GBJ-2000×2000	5.6	240	560	Y160M-6	7.5	3.1
GBJ-2500×2500	9.2	211	560	Y180L-6	15	3.9
GBJ-3000×3000	19.1	180	700	Y225S-8	18.5	4.6
GBJ-4000×4000	45	153	1000	Y250M-8	37	9.6

General Technical Specification Table

Parameter	High Weir Spiral Classifier	High-Efficiency Agitation Tank
Type	Spiral Classifier	High-Efficiency Agitation Tank
Structural Features	High weir type, single spiral/double spiral	Umbrella-type impeller with guide vanes, spray body at the bottom
Core Functions	Slurry particle size classification, desliming, dewatering	Full mixing and circulation of slurry and reagents, conducive to flotation
Applicable Scenarios	Metal ore beneficiation process, ore washing operations	Slurry preparation before flotation
Supporting Equipment	Commonly used in closed-circuit process with ball mills	Often used with flotation machines

Dimension Drawings and Key Dimensions: `[Image: /images/high-weir-spiral-classifier-and-agitation-tank-dimension-drawing.webp]`

Materials Table

Component	Standard Material	Optional Material	Description
Classifier Trough	Carbon Steel	Stainless Steel, Wear-Resistant Steel Plate	Carries slurry, requires corrosion and wear resistance
Classifier Spiral Blade	High Manganese Steel, Wear-Resistant Alloy	Stainless Steel, Ceramic Composite	Core wear part, highly wear-resistant
Classifier Drive Shaft	40Cr/45# Steel	Alloy Steel	Tempered, smooth transmission
Agitator Tank Body	Carbon Steel	Stainless Steel, Wear-Resistant Steel Plate	Carries slurry and reagents, needs rust and wear resistance
Agitator Tank Impeller	High Manganese Steel, Wear-Resistant Alloy	Stainless steel, rubber lining	Umbrella-shaped impeller, core wear part
Agitator Tank Flow Guide	Carbon Steel	Stainless Steel, Wear-Resistant Steel Plate	Increases stirring and circulation capability
Agitator Tank Main Shaft	Forgings of 40Cr/42CrMo	Alloy Steel	Quenching and tempering treatment, bears torque
Bearings	Self-aligning roller bearings	Double-row cylindrical roller bearings	Withstands heavy load and impact
Motor	Full copper coil motor	Explosion-proof motor	Standard three-phase asynchronous motor
Control Box	Carbon steel / stainless steel	Rainproof and dustproof type	Optional variable frequency speed control

Installation Method: Both the high-weir spiral classifier and the high-efficiency agitation tank must be installed on a solid concrete foundation, which should bear the weight of the equipment and the dynamic load during operation; during installation, ensure that the foundation level meets requirements, and anchor bolts are tightened according to torque specifications; after positioning the equipment, adjust the level to ensure the transmission shaft is parallel to the motor shaft; the motor and reducer are connected via belt or direct drive, and belt tension or alignment accuracy needs to be adjusted to ensure smooth transmission; for the high-weir spiral classifier, ensure the tank slope meets the design requirement and that the clearance between the spiral blades and the tank bottom is uniform; for the high-efficiency agitation tank, ensure uniform clearance between the impeller and the baffle, and that the slurry and reagent inlet and outlet pipelines are properly sealed to ensure smooth circulation; after installation, conduct a no-load test run, checking if the spiral shaft or impeller rotates smoothly without abnormal vibration or noise; during the load test run, gradually increase the feed, observe the classification or mixing effect and the motor current, ensuring it does not exceed the rated current; a dust removal system should be equipped to reduce dust pollution; a central control system can be installed for online monitoring and automatic control.

Application Scenario Table

Industry	Application	Recommended Configuration	Key Requirements
Ferrous Metal Ore Dressing	Classification of iron, manganese, and other ore slurries	FG-10–2FC-30	High classification efficiency, large capacity, wear-resistant
Non-ferrous Metal Ore Dressing	Classification of copper, gold, lead-zinc, and other ore slurries	FG-5–2FC-20	Controllable classification particle size, stable operation
Mineral Washing Operations	Desliming, dewatering	FG-3–FG-15	Good desliming effect, large capacity
Closed Grinding Circuit	Forming a closed loop with the ball mill	FG-12–2FC-30	Matching with ball mill, reasonable circulating load
Pulp Preparation Before Flotation	Fully mixing slurry and reagents	GBJ-1000–GBJ-4000	Strong stirring capacity, good circulation effect, low reagent consumption
Chemical Industry	Material stirring and mixing	GBJ-1000–GBJ-2500	Pollution prevention, corrosion resistance, uniform mixing
Building Materials Industry	Slurry stirring	GBJ-1500–GBJ-3000	High processing capacity and stable operation

Note: Gaoyan screw classifier is suitable for particle size grading of slurry in metal beneficiation processes, and can also be used for desludation and dewatering in washing operations, often forming closed-loop processes with ball mills. The high-efficiency mixing tank uses umbrella-shaped impellers and flow guide designs, ensuring thorough mixing and circulation of slurry and pharmaceuticals, which is beneficial for flotation. Explosion-proof motors should be selected for explosive environments. For highly abrasive materials, it is recommended to use high-manganese steel or wear-resistant alloy spiral blades and impellers.

Selection Precautions (Coordination between Gaoyan Screw Classifier and High-Efficiency Mixing Tank): The Gaoyan screw classifier and the high-efficiency mixing tank have a front-and-rear coordination in the ore processing flow. The Gaoyan screw classifier usually forms a closed-loop process with the ball mill, responsible for grading the particle size of the ore products. Qualified fine-grained products proceed to the next step (such as flotation), and the coarse grain size is returned to the ball mill for further grinding; The high-efficiency mixing tank is located before the flotation operation, responsible for thoroughly mixing the graded slurry with the flotation agent, ensuring the mineral surface is fully chemicalized and creating favorable conditions for flotation. During selection, the appropriate specifications of the Gaoyan screw classifier and high-efficiency mixing tank should be selected according to the processing capacity of the concentrator plant, grinding fineness, and flotation process requirements, ensuring the entire beneficiation process operates efficiently and stably.

## Technical FAQ

1. What is the Gaoyan screw classifier?

The Gaoyan spiral classifier is widely used for particle size classification of slurry in metal beneficiation processes, and can also be used for desludation and dewatering during washing operations, often forming a closed-loop process with ball mills.

2. What is the working principle of the Gaoyan screw classifier?

By utilizing the principle that solid particles settle at different rates in liquids, fine ore particles float in water and overflow, while coarse ore particles settle at the bottom of the tank and are pushed upward by a spiral, thereby achieving mechanical classification.

3. What are the models of Gaoyan screw classifiers?

Gaoyan screw classifier models include FG-3, FG-5, FG-7, FG-10, FC-10, FG-12, FC-12, 2FG-12, 2FC-12, FG-15, FC-15, 2FG-15, 2FC-15, FG-20, FC-20, 2FG-20, 2FC-20, FG-24, FC-24, 2FG-24, 2FC-24, 2FC-24, 2FC-30, 2FC-30.

4. What is the range of the spiral diameter in a high weir spiral classifier?

The spiral diameter ranges from 300-3000mm and varies depending on the model.

5. What is the motor power of a high weir spiral classifier?

The driving motor power is 1.1-40kW, and the lifting motor power is 1.1-15kW, depending on the model.

6. What are the wear parts of a high weir spiral classifier?

Spiral blades, drive shafts, bearings, etc. Among these, the spiral blade is the core wear part and it is recommended to use high manganese steel or wear-resistant alloy material.

7. What are the common faults of a high weir spiral classifier?

Spiral blade wear (due to strong material abrasion), bearing overheating (poor lubrication or overloading), drive belt slack or breakage (insufficient tension), abnormal vibration (unbalanced spiral shaft or foreign object blockage), reduced classification efficiency (incorrect tank slope or uneven feeding).

8. Can a high weir spiral classifier be used for ore washing?

Yes, it is suitable for de-sliming and dewatering in ore washing, with good de-sliming effect and large processing capacity.

9. Can a high weir spiral classifier be customized?

Yes, spiral diameter, tank length, motor power, spiral blade material (high manganese steel/wear-resistant alloy/stainless steel), motor configuration (explosion-proof motor), dust removal system, central control system, and other parameters can be customized.

10. What is a high-efficiency agitation tank?

The GBJ type high-efficiency agitation tank has a larger impeller diameter and increased linear speed, enhancing the stirring capability of slurry and reagents. It is mainly used for slurry preparation before flotation to ensure adequate reagent coating on mineral surfaces, which is beneficial for flotation.

11. What is the working principle of a high-efficiency agitation tank?

The impeller is designed as an umbrella-shaped impeller to enhance the stirring capability of slurry and reagents, as well as circulation ability; the tank has a diverter, and the impeller is located inside the diverter, further increasing stirring capability and allowing slurry and reagents to circulate more effectively; the umbrella-shaped impeller exerts downward pressure during operation, accelerating slurry suction; a spray device is installed at the lower part of the diverter, allowing slurry and reagents to enter and further enhancing circulation.

12. What models of high-efficiency agitation tanks are available?

The models of high-efficiency mixing tanks include GBJ-1000×1000, GBJ-1250×1250, GBJ-1500×1500, GBJ-2000×2000, GBJ-2500×2500, GBJ-3000×3000, GBJ-4000×4000.

13. What is the effective volume of the high-efficiency mixing tank?

The effective volume ranges from 0.58 to 45 m³, varying by model.

14. What is the motor power of the high-efficiency mixing tank?

The motor power ranges from 2.2 to 37 kW, depending on the model.

15. What are the wear parts of the high-efficiency mixing tank?

Impellers, flow guides, main shaft, bearings, etc., where the impeller is the core wear part. It is recommended to use high manganese steel or wear-resistant alloy.

16. What are common faults of the high-efficiency mixing tank?

Impeller wear (due to highly abrasive materials), bearing overheating (poor lubrication or overload), uneven mixing (insufficient impeller speed or worn flow guide), abnormal vibration (impeller imbalance or foreign object blockage), pipeline blockage (excessive slurry concentration or reagent crystallization).

17. Can the high-efficiency mixing tank be customized?

Effective volume, impeller speed and diameter, motor power, impeller material (high manganese steel/wear-resistant alloy/stainless steel), motor configuration (explosion-proof motor), tank material (carbon steel/stainless steel), and central control system can be customized.

18. How should a high-weir spiral classifier and a high-efficiency mixing tank be used together?

The high-weir spiral classifier is usually combined with a ball mill to form a closed circuit process, responsible for classifying the ground ore; the high-efficiency mixing tank is placed before flotation, responsible for thoroughly mixing the classified slurry with flotation reagents, ensuring full reagent coverage on the mineral surfaces and creating favorable conditions for flotation.

19. Do the high-weir spiral classifier and high-efficiency mixing tank comply with RoHS and REACH?

Standard equipment complies with RoHS and REACH regulations and does not contain SVHC (Substances of Very High Concern). Please refer to the product inspection report for details.

20. How should the high-weir spiral classifier and high-efficiency mixing tank be maintained?

Regularly check the wear condition of the spiral blades, impellers, and guide vanes, and replace or adjust them in a timely manner; regularly check the lubrication of bearings, and replenish or replace grease; regularly check the belt tension; regularly check whether the foundation bolts and connecting bolts are loose; regularly clean the accumulated material and foreign objects in the water tank and mixing tank; regularly check the operating status of the motor and reducer.

Technical FAQ

Which test data improves equipment selection?

Provide feed assay, particle-size distribution, slurry density, liberation size and target recovery or concentrate grade.

Can one machine handle every ore?

No. Mineral properties and process conditions change the required separation method, size and configuration.

Authoritative references

For standards and safety context, see ISO standards and the U.S. Mine Safety and Health Administration. Confirm the exact local requirements for your project.

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