The Merits And Demerits Of The Spiral Classifier

Spiral classifier is short for classifier

Spiral classifier is short for classifier. Classifier includes high weir spiral, double spiral, sank single spiral and the double spiral.

Spiral classifier is one of the beneficiation equipments. According to the different proportion of solid particles, the rate of precipitation in the liquid is also different. Spiral classifier concentrates fine ore based on the principle. After grinding, the materials will pass through filter, through which the coarse materials will return to ball mill and the fine ore will be discharged from the overflow pipe.

At present, Henan Hongxing Mining Machinery Co., Ltd. mainly produces and sells two types of spiral classifier, one is the single spiral classifier and the other is the double spiral classifier. Customers can customize the spiral classifier with different models and different sizes according to the actual requirements.

Spiral classifier is composed by chute, hollow shaft, helical blade, spiral lifting device, thrust bearings, gears, feed port, discharging port and overflow weir. Classification chute is tilted placed with inclination for 12o-18. 5o, the bottom of the chute is semi-circular. The slurry is fed from feeding port and completes classification at the bottom of the grading slots. Fine-grained materials drain away from discharging port trough overflow weir with flow. Coarse products subside at the classification band, and then transported to grit discharging port by the spiral. Spiral is installed in the hollow spindle, both ends of which are supported by bearings; the upper end of the shaft is with the gear, the lower end of the shaft is placed within the lifting mechanism, if necessary, adjust the height of the spiral in the grading tank. Giving slurry continuously, then the overflow and grit will be continuously and respectively discharged. Spiral classifier and grinding bodies make a closed circuit, the grit are sent into the mill for re-grinding through the chute, the grit back to the mill is called return sand.

However, everything has two sides. So let's talk about the advantages as well as its disadvantages. The disadvantage of the spiral classifier are: heavy body, large footprint, big maintenance workload, and difficult to achieve automatic control; affected by the density and shape, the material cannot be precisely classified according to particle size, resulting in low classification efficiency, typically only 20% to 40%; overflow particle size depends mainly on the concentration adjustment, usually the most detailed up to -0 074 mm. The advantages of the spiral classifier are: stable and reliable performance, easy-to-operate, can be connected with the ball mill without pump. The biggest spiral classifier specification made in China is 3.0 m, can reach artesian connection with 3.6m x4.0 m ball mill. The big volume of the spiral classifier has buffer action and plays the role of transporting material, while the return concentration can be as high as 65% to 80%, thus good for the grinding operation.

The spiral classifier can be installed after the check with no harm and no screw loosening. The spiral classifier should be steadily installed on the base of pouring concrete. The basic design should have nice supporting function, which can reduce the shear stress on the screw.

Only when knowing the structure and working principle of the spiral classifier, can the machine be operated.

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