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Spiral classifier is also called screw classifier. The spiral classifier is widely used in the beneficiation plant to form a closed loop with the ball mill to split the ore or to classify the ore and fine mud, grade the slurry during the spiral classifier mineral processing, and dewater in washing operations.
The spiral classifier belongs to the beneficiation equipment. It is mainly composed of a transmission device, a spiral body, a trough body, a lifting mechanism, a lower bearing (bearing bush) and a discharge valve. The spiral classifier can process the material like gold, sand, etc. Since the specific gravity of solid particles is different, the rate of precipitation in the liquid is different. The spiral classifier is used to treat alluvial sand ore, especially suitable for useful minerals.
The monomer has high dissociation and flatness. Spiral classifiers are mainly classified into high weir single and double spiral classifier, low weir single and double spiral classifier, and immersed single and double screw classifier. Nowadays, low weir type one is not very common, high weir type and immersed type are preferable.
The spiral classifier is widely used in the concentrating plant to be equipped with a ball mill to form a closed-loop cycle split ore, or used in the gravity ore dressing plant to classify ore and fine mud, to grade size of the slurry in the metal beneficiation process, and the deliming and dewatering operations in the washing operation. The gravel spiral classifier has the characteristics of simple structure, reliable operation and convenient operation.
The classifier is based on the principle that the solid particle size is different and the specific gravity is different, so the sedimentation velocity in the liquid is different. Fine ore spill out of the water, and the coarse ore particles will be sank to the bottom of the tank and finally pushed up by the screw.
It can filter the powder ground in the ball mill. The coarse material is screwed into the mill feed port by the spiral rotary vane, and the filtered fine material is discharged from the overflow pipe. The base of the machine is made of channel steel, and the body is welded by steel plate. The screw shaft has a water inlet head, a shaft head, and a pig iron sleeve. It is wear-resistant and durable. The lifting device is divided into electric and manual.
According to the number of spiral, spiral classifier can be divided into single spiral classifier and double spiral classifier; according to the submerged overflow surface depth of spiral blade, it can be divided into high weir type and submerged types.
Spiral classifier is widely used in mineral processing plant to form closed cycle way with ball mill for split mineral sand, or used in gravity concentrator to grade ore and fine mud, or the size grading of slurry in ore dressing process as well as desliming, dehydration and other operations in ore washing operations. It has the characteristics of simple structure, reliable work, convenient operation, etc.
Spiral classifier is a type of classifying machine that classifies materials based the principle that the solid particles with different sizes and proportions have different falling speed in the liquid, and fine ore particles float in the water and coarse ore particles sink to the bottom of the chute and coarse ore particles are pushed by the spiral to the upper part and discharged. Hongxing spiral classifier is able to filter the powdery particle crushed by the grinding mill and whirl the coarse particles with the spiral to the feeding mouth of the grinding mill and discharge the filtered fine particles.
Model Spiral Diameter (mm) Trough Length (mm) Spiral rotate speed (r/min) Processing capacityt/d Motor Power kw Dimensions mm Total weight t Sand -return Overflow For driving For lifting Length Width Height FG-3 300 3000 12-30 80-150 20 1.1 ---- 3850 490 1140 0.7 FG-5 500 4500 8-12.5 135-210 32 1.1 ---- 5430 680 1480 1.9 FG-7 750 5500 6-10 340-570 65 3 ---- 6720 980 1820 3.1 FG-10 1000 6500 5-8 675-1080 110 5.5 ---- 7590 1240 2380 4.9 FC-10 8400 675-1080 85 7.5 ---- 9600 1240 2680 6.2 FG-12 1200 6500 4-6 1170-1870 155 7.5 2.2 8180 1570 3110 8.5 FC-12 8400 1170-1870 120 7.5 2.2 10370 1540 3920 11.0 2FG-12 6500 2340-3740 310 15 4.4 8230 2790 3110 15.8 2FC-12 8400 2340-3740 240 15 4.4 10370 2790 3920 17.6 FG-15 1500 8300 4-6 1830-2740 235 7.5 2.2 10410 1880 4080 12.5 FC-15 10500 1830-2740 185 7.5 2.2 12670 1820 4890 16.8 2FG-15 8300 2280-5480 470 15 4.4 10410 3390 4080 22.1 2FC-15 10500 2280-5480 370 15 4.4 12670 3370 4890 30.7 FG-20 2000 8400 3.6-5.5 3290-5940 400 11-15 3 10790 2530 4490 20.5 FC-20 12900 3210-5940 320 11-15 3 15610 2530 5340 28.5 2FG-20 8400 7780-11880 800 22-30 6 11000 4600 4490 35.5 2FC-20 12900 7780-11880 640 22-30 6 15760 4600 5640 48.7 FG-24 2400 9130 3.67 6800 580 15 3 11650 2910 4970 26.8 FC-24 14130 6800 490 18.5 4 16580 2930 7190 41.0 2FG-24 9130 13600 1160 30 6 12710 5430 5690 45.8 2FC-24 14130 13700 910 37 8 17710 5430 8000 67.9 2FG-30 3000 12500 3.2 23300 1785 40 8 16020 6640 6350 73.0 2FC-30 14300 23300 1410 ---- ---- 17091 ---- 8680 84.8 Model Spiral Diameter (mm) Spiral rotate speed (r/min) FG-3 300 12-30 FG-5 500 8-12.5 FG-7 750 6-10 FG-10 1000 5-8 FC-10 FG-12 1200 4-6 FC-12 2FG-12 2FC-12 FG-15 1500 4-6 FC-15 2FG-15 2FC-15 FG-20 2000 3.6-5.5 FC-20 2FG-20 2FC-20 FG-24 2400 3.67 FC-24 2FG-24 2FC-24 2FG-30 3000 3.2 2FC-30
Spiral classifier and hydrocyclone are the main equipments for the classification operation of the concentrator. Although the rapid development of the cyclone once made the spiral classifier lose its market, but with the continuous changes in the requirements of the selection plant, it was found that the spiral classifier also has its advantages. The spiral centrifugal classifier has the advantages of strong continuous operation, large processing capacity, low energy consumption per unit output, and convenient maintenance. It can handle particles with a diameter of 1um-10mm. The horizontal spiral centrifugal classifier adopts the method of wet classification, and its processing capacity can reach 1~20 (m3 slurry) kg/h. It is widely used in minerals, metal powders, chemical raw materials, pigments, fillers, etc.
The screw classifier is based on the principle that the solid particles are different in size and specific gravity, so the settling speed in the liquid is different. Fine ore particles float in the water and overflow, and coarse ore particles sink to the bottom of the tank. Spiral classifier is widely used in beneficiation plant to match with ball mill to form a closed circuit circulation path to distribute ore sand. Filter the material powder milled in the mill, and then use the spiral piece to screw the coarse material into the ball mill inlet, and the filtered fine material is discharged from the overflow pipe. There are four classifiers: high weir single spiral and double spiral, submerged single spiral and double spiral.
The spiral classifier is widely used in the classification of the grinding circuit of the concentrator and the operations of washing, desilting and dewatering. Its main advantages are simple equipment structure, reliable work and convenient operation.
1. It is used for the separation of machine-made sandstone powder, which can control the content of machine-made sandstone powder very conveniently and meet the requirements of users.2. It is suitable for dry technology large and medium-sized sand production lines.3. The content of 0.000.75mm stone powder can be adjusted between 2%-15%.4. Stone powder quality is easy to control, fineness adjustment is convenient, flexible and reliable.5. Using frequency conversion control technology, the operation is more concise.6. It can be connected with the mill in the closed circuit of the grinding circuit. Compared with hydrocyclone, the power consumption is lower.7. The main disadvantage is that the classification efficiency is low, the equipment is bulky, and the floor space is large. Due to the limitations of equipment specifications and production capacity, it cannot generally form a closed circuit with a ball mill of 3.6m or more.
The spiral classifier is divided into two types: high weir type and submerged type. High weir classifier is suitable for coarse particle classification, the maximum size of overflow is generally 0.4~0.15mm; submerged classifier is suitable for fine particle classification, the maximum size of overflow is generally below 0.2mm.