High-Weir Spiral Classifier vs. Submerged Spiral Classifier for Sand Washing

December.03,2025

Different Spiral Blade Positions

High-Weir Spiral Classifier: Its overflow weir is higher than the spiral’s rotation axis but lower than the upper edge of the spiral at the overflow end. There are single-spiral and double-spiral types. It has a larger settling area, and the weir height is adjustable, suitable for adjusting the classification particle size.

Submerged Spiral Classifier: The spiral blades at the overflow end are completely submerged in the slurry. It has a large settling area, a deep classification tank, and the spiral’s agitation has less impact on the slurry surface, resulting in a stable classification surface and a large, fine overflow.

Differences in Classification Effect

High-Weir: Suitable for coarse-grain classification, typically used to separate minerals larger than 0.15mm, often used in the first stage of grinding. The area of ​​its settling zone can be adjusted as needed to change the classification particle size.

Submerged: Suitable for fine-grain classification, typically used to separate minerals smaller than 0.15mm, often used in the second stage of grinding. Due to its stable classification surface, it is suitable for processing fine-grained slurries and has a high overflow output.

Differences in Application Scenarios

High-weir grinding: Commonly used in the first stage of grinding in mineral processing plants, suitable for processing coarse-grained minerals and effectively separating larger particles.

Submerged grinding: Commonly used in the second stage of grinding in mineral processing plants, suitable for processing fine-grained minerals and effectively separating smaller particles. Suitable for classification equipment in fine grinding or two-stage grinding.