High Weir Spiral Classifier

What is High Weir Spiral Classifier?

High weir spiral classifier is a kind of equipment used to classify solid particles in the slurry, and its main feature is to utilize the difference of the settling speed of solid particles in the slurry to classify them. The sand return end of Chunlei spiral classifier is increased with sand return automatic lifting device, by which the configuration of big scoop head of ball mill can be canceled to make the ball mill equipment run more smoothly.

If you are a beginner and do not know about High Weir Spiral Classifier, tell us your raw material characteristics, finished product requirements, site conditions, production budget, hourly production, and other requirements, we have professional engineers to equip you with a suitable model at a reasonable price. Next, let’s see the types of High Weir Spiral Classifier we can supply.

What Is High Weir Spiral Classifier Used For?

High weir spiral classifier is an auxiliary equipment for grinding, pre-grading and check grading, also used for washing clay-containing ores as well as desliming and dewatering the slurry.

High weir spiral classifier is widely used in coarse grading, and used in conjunction with ball mill to form a closed-circuit circulating system for diverting ore sands, or grading ore sands and fine sludge in gravity separation plant, as well as metal beneficiation process for slurry particle size classification and de-sludging, dewatering and other operations in the ore washing operation.

For example: A mineral processing plant, beneficiation often due to uneven particle size of the ore waste a lot of material, recommended by friends to find Chunlei Machinery, technical personnel according to the customer needs to provide information and the existing equipment configuration, recommended for the customer can be pre-graded high weir spiral classifier, Chunlei high weir spiral classifier grading overflow size ≥ 0.015mm, just to meet the customer’s needs, the effect of the application of significant, ore dressing Recovery rate increased by 18%.

High Weir Spiral Classifier ordered by Customer

Chunlei Machinery has been engaged in mining machinery manufacturing for more than 30 years, with a wealth of experience in building websites and customer cases, served customers all over the world!

Technical Parameters of High Weir Spiral Classifier

Typology	Model	Screw speed (r/min)	According to the return sand processing capacity (t/d)	According to overflow treatment capacity (t/d)	Screw diameter (mm)	Spiral length (mm)	Slope of flume	Transmission motor model	Transmission motor power (kW)	Lifting motor model	Lifting motor power (kW)	Weight (kg)
High Weir Type Single screw	FLG-300	7.7	30 ~80	10 ~30	φ300	3900	14 ~18	Y100L1-4	2.2	manually operated	—	668
	FLG-500	8	145~260	21 ~75	φ500	4390		Y112M-6				1600
	FLG-750	7.8	100~445	31~165	φ750	5500		Y132S-6	3			2716
	FLG-1000	6.7	473~1026	85	φ1000	6556		Y132M2-6	5.5			4000
	FLG-1200	5,6,7	1145~1600	150	φ1200	6500		Y132M2-6	5.5	Y90L-4	1.5	7943
	FLG-1500	2.5,4,6	1140~2730	235	φ1500	8265		Y160M-6	7.5	Y100L1-4	2.2	11827
	FLG-2000	3.6,5.5	3240~5940	400	φ2000	8700		Y160L-6/4	11,15	Y100L2-4	3	20814
	FLG-2400	3.6	6800	580	φ2400	9130		Y200L2-6	22	Y112M-4	4	24194
	FLG-3000	3.2	11625	890	φ3000	12500		Y200L-4	30	Y112M-4	4	42188
High Weir Double Screw	2FLG-1200	5,6,7	2290~3200	310	φ1200	6500		Y132M2-6	5.5X2	Y90L1-4	1.5X2	15840
	2FLG-1500	2.5,4,6	2240~5360	460	φ1500	8230		Y160M-6	7.5X2	Y100L1-4	2.2X2	22903
	2FLG-2000	3.6,5.5	6400~10800	750	φ2000	8400		Y160L-4	15X2	Y100L2-4	3.0X2	34621
	2FLG-2400	3.63	13600	1160	φ2400	9130		Y200L2-6	22X2	Y112M-4	4X2	42460
	2FLG-3000	3.2	23300	1785	φ3000	12500		Y200L-4	30X2	Y112M-4	4.0X2	73030

Working Principle of High Weir Spiral Classifier

High weir spiral classifier adopts to feed the finely ground slurry into the flume from the inlet located in the middle of the settling area, and below the inclined installation of the flume is the slurry grading and settling area, and the spiral rotates at a low speed, plays a stirring role to the slurry, so that the fine particles are suspended to the top, and flow to the overflow weir and be overflowed. Coarse particles sink to the bottom of the tank and are transported by the spiral to the discharge port as return sand. The position of overflow weir is higher than the bearing center at the lower end of the screw shaft and lower than the upper edge of the screw at the overflow end. The high weir type overflow weir is higher than the rotating shaft of the spiral, but lower than the upper edge of the spiral at the overflow end. The area of the settling area of this kind of classifier is larger than that of the low weir type, and its weir height can be adjusted within a certain range, i.e., the area of the settling area can be adjusted and changed within a certain range, so that the particle size of the classification can be adjusted, and it is a kind of commonly used equipment in the grinding cycle.

Advantageous features of High Weir Spiral Classifier

• The sand return end has increased the sand return automatic lifting device and canceled the configuration of the big spoon head of the ball mill, thus slowing down the unbalanced impact on the big and small gears.
• Generally, it can save 1~1.5 degrees of electricity per ton of ore.
• Avoiding the frequent maintenance of the big spoon head.
• Slows down the unbalanced impact on the large and small gears of the ball mill.
• Nylon bearings are used at the overflow end of the big shaft, which not only reduces the cost and lengthens the service life, but also makes the maintenance and replacement convenient.
• The blade adopts automatic cutting down, neat and beautiful.

High Weir Spiral Classifier price

As for the price, we can’t show you the exact price because we deal with customers from all over the world and there are many factors affecting the price. If you want to know the price of High Weir Spiral Classifier, you can leave a message to us on this page, we have professional sales staff and engineers to explain to you.

As one of the old brand mining machinery manufacturers in Henan, Chunlei Machinery strictly controls every High Weir Spiral Classifier for sale with more reliable quality. Chunlei has its own R&D team and production site, and sells directly, enjoying factory super low price. What are you waiting for? Contact us immediately!

FAQ – High Weir Spiral Classifier

1. What is a High Weir Spiral Classifier used for?
A High Weir Spiral Classifier is mainly used in mineral processing to separate fine particles from coarse material by sedimentation. It’s commonly applied in closed circuits with ball mills, or for washing, dewatering, and desliming ores like gold, copper, iron, and zinc.

2. How does a High Weir Spiral Classifier differ from a Low Weir Spiral Classifier?
The key difference is the weir height at the overflow point. In a high weir type, the weir is higher than the lower bearing center, providing a longer settling area and finer separation. Low weir types are used for coarse separations. High weir classifiers offer better control over overflow fineness.

3. What particle size can a High Weir Spiral Classifier handle?
Typically, it handles feed particle sizes up to 3 mm (depending on the model). The overflow particle size can range from 0.15 mm to 0.07 mm (100–200 mesh), making it ideal for fine classification in grinding circuits.

4. Can I use a High Weir Spiral Classifier for sand dewatering?
Yes. It is widely used for sand dewatering and washing in construction, mining, and aggregate industries. The spiral slowly rotates to convey settled solids upward while excess water overflows the weir, achieving effective dewatering.

5. What materials are the spiral blades made of?
Spiral blades are typically made of wear-resistant materials such as Ni-Hard iron, high-chromium cast iron, or rubber-lined steel. This extends service life when processing abrasive ores. Custom options are available based on material abrasiveness.

6. How do I choose the right size High Weir Spiral Classifier?
Selection depends on feed solids percentage, desired overflow fineness, tonnage, and ore type. Key parameters include tank width, spiral diameter, weir height, and slope angle. You can contact us with your material characteristics – we offer free sizing calculations.

7. What maintenance does a High Weir Spiral Classifier require?
Routine checks should include:

• Spiral blade wear (replace when worn)
• Gearbox oil level and condition
• Lower bearing lubrication and sealing
• Liner and weir plate wear
• Drive motor and belt tension

Most components are easy to access for fast field replacement.

8. Can it be integrated with a ball mill circuit?
Absolutely. The most common application is in closed grinding circuits. The classifier receives ball mill discharge, separates fine particles as overflow (to flotation or leaching), and returns coarse material back to the mill – improving grinding efficiency.

9. Is a High Weir Spiral Classifier better than a hydrocyclone?
It depends. Hydrocyclones handle higher tonnages in smaller footprints but require more head and are sensitive to feed pressure. Spiral classifiers offer lower operating cost, no pumps (when gravity-fed), simpler operation, and better performance for finer separations with moderate tonnages. Many plants use both for different stages.

10. What’s the typical delivery time for a High Weir Spiral Classifier?
Standard models (single or twin spiral) are usually delivered in 25–40 days after payment confirmation. Custom sizes or rubber-lined versions may take 45–60 days. Expedited options are available – contact us for current lead times.