There are four types of classifiers, high weir type single and double spiral classifier, immersed single and double spiral classifier.
Spiral classifier (Screw classifier) is 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.
Spiral classifiers are suitable for:
1. Separation of fine particles and liquid from coarse particles
2. Separation of light particles from heavy particles
3. Separation of the particles into a number of products graded according to size
4. Separation of liquid from solid particles
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