Spiral classifier is a mechanical grading equipment which works based on the different proportion of solid particles with different sedimentation rate in the liquid. Spiral classifier is also known as screw classifier and mining spiral classifier, which is widely used not only for shunting mineral sand in closed loop combined with ball mills, or in the gravity grading of ore and fine mud, but also in grading pulp particle size of metal beneficiation process, dehydration and washing operations of the mud. Fine mineral particles floating in the water to overflow while the coarse mineral particles sink to the bottom, then pushed out by the screw to the ball mill feed mouth, thus filter out the fine material discharged from the overflow tube.
Screw classifiers are widely used in the ore dressing plant working with the ball mill to form a closed loop process, or used in the gravity separation plant grading ore and fine mud, and applied to classify pulp particals in metal beneficiation process, as well as being used for mud removal, dehydration in ore washing operations.
Screw classifiers have simple structure, reliable performance and easy to operate. The spiral classification machine base adopts channel steel and the body uses welded steel. Water head, screw shaft and shaft head use cast iron sleeve making it wear-resistant and durable. Lifting devices can be electric and manual. The spiral classifier can be different types such as high weir single spiral or double spirals, sinking single spiral or double spirals.
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screw classifier: http://www.fte-china.com/pro/classifiers.html