Shanghai Pohill Machinery
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Shanghai Pohill Machinery
The spiral classifier is one of the most common classification equipment in beneficiation plants. It is mainly used for ore classification, desliming, and washing operations, and is widely used in the grinding circuit for pre-classification and inspection classification.
Depending on the position of the overflow weir, it can be divided into high weir type (FG) and submerged type (FC). The high weir type is suitable for coarse particle classification (overflow particle size 0.15-0.3mm), while the submerged type is suitable for fine particle classification (overflow particle size 0.07-0.15mm).
The equipment features simple structure, reliable operation, convenient maintenance, and is widely used in beneficiation, building materials, chemical and other industries.
Slurry enters the classifier tank through the feed inlet. Fine particles are discharged with the overflow over the weir, while coarse particles settle to the bottom and are lifted by the rotating spiral blades to the sand return outlet, achieving classification by particle size.
The high-weir type (FG) suits coarse classification with overflow size of 0.15-0.3mm, while the submerged type (FC) suits fine classification with overflow size of 0.07-0.15mm, performing pre-classification and check classification in grinding circuits.
Pre-classification and check classification with ball mills
Removal of fine slime from pulp to improve downstream separation
Washing of mineral surfaces to improve product quality
Classification in building materials and chemical industries
| Model | Spiral Dia (mm) | Rot Speed (r/min) | Tank Length (mm) | Overflow (t/d) | Sand Return (t/d) | Power (kW) |
|---|---|---|---|---|---|---|
| FG-5 | 500 | 8-12.5 | 4500 | 32 | 143-261 | 1.1 |
| FG-7 | 750 | 4.5-9.9 | 5500 | 65 | 256-564 | 3.0 |
| FG-10 | 1000 | 1.6-7.5 | 6500 | 85 | 473-1026 | 5.5 |
| FG-12 | 1200 | 5-7 | 6500 | 155 | 1170-1600 | 5.5 |
| 2FG-12 | 1200 | 5-7 | 6500 | 310 | 2340-3200 | 11.0 |
| FG-15 | 1500 | 2.5-6 | 8300 | 230 | 1140-2740 | 7.5 |
| 2FG-15 | 1500 | 2.5-6 | 8265 | 470 | 2280-5480 | 15.0 |
| FG-20 | 2000 | 3.6-5.5 | 8400 | 400 | 3890-5940 | 11.0 |
Note: Parameters are for reference only. Customized models available according to actual needs.
Special spiral structure and tank design ensure uniform overflow particle size and high classification efficiency.
High screw speed and large tank capacity, processing capacity up to several thousand tons per day.
Simple structure, low energy consumption, low maintenance cost, long service life.
High weir type and submerged type are available to meet different classification particle size requirements.
The high-weir type (FG) suits coarse classification with overflow size of 0.15-0.3mm; the submerged type (FC) suits fine classification with overflow size of 0.07-0.15mm.
It performs pre-classification and check classification in the grinding circuit: coarse sand returns to the mill for further grinding, and fine overflow feeds downstream separation, forming closed-circuit grinding.
Classification efficiency is affected by pulp density, feed size, spiral speed and overflow weir height, all adjustable to process requirements.
The FG single-spiral and 2FG double-spiral series cover 8 models with spiral diameters from size 5 to 15, selectable by throughput.