There are four types of classifiers, high weir type single and double spiral classifier, immersed single and double spiral classifier.
Spiral classifiers are widely used for distributing ore in the close circuit with ball mill, grading ore and fine slit in the gravity mill, grading granularity in the flow of metal ore-dressing and desliming and dehydrating in the washing. Advantages are simple structure, reliable working condition and convenient operation. According to the principle that different grains are with different specific gravity and sedimentation rate in the liquid, the fine ore flows in the water and the coarse ore sinks in the bottom. The classifier that has machine grading by discharging from the top can filtrate the materials and send coarse materials to the feeding mouth and discharge the fine material from the pipe. The seat of the machine adopts channel steel and body adopts armor plate and the spiral axle adopts cast iron, so it’s durable. The lifting equipments have two types, by electricity and hand.

Model	Spiral diam-eter (mm)	Spiral rotation speed (r/min)	Trough length (mm<=)	Motor power(kw<=)		Dimensions(mm<=)			Weight (t)
				For driving	For lifting	Len-gth	Width	Height	<=
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	---	6270	980	1820	2.7
FG-10	1000	5-8	6500	5.5	---	7590	1240	2380	4
FC-10			8400	7.5		9600	1240	2680	6
FG-12	1200	4-6	6500	7.5	2.2	8180	1570	3110	8.5
FC-12			8400	7.5	2.2	10370	1540	3920	11
2FG-12			6500	15	4.4	8230	2790	3110	15.8
2FC-12			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			10500	7.5	2.2	12670	1820	4890	16.8
2FG-15			8300	15	4.4	10410	3390	4080	22.1
2FC-15			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			12900	11-15	3	15610	2530	5340	28.5
2FG-20			8400	22-30	6	11000	4600	4490	35.5
2FC-20			12900	22-30	6	15760	4600	5640	48.7
FG-24	2400	3.67	9130	15	3	11650	2910	4970	25.7
FC-24			14130	18.5	4	16580	2930	7190	41
2FG-24			9130	30	6	12710	5430	5690	45.8
2FC-24			14130	37	8	17710	5430	8000	67.9
2FG-30	3000	3.2	12500	40	8	16020	6640	6350	73
2FC-30			14300			17091		8680	84.8