Common spiral classifiers can be classified according to the overflow height, that is, the position of the spiral in the water tank is different from the height of the pulp surface.
Below are some common classifiers:
1). High Dam Spiral Classifier
The high dam type spiral classifier means that the overflow dam is higher than the spiral axis of the spiral, but lower than the upper edge of the spiral at the overflow end. There are high dam type single spiral and double spiral classification. This kind of classifier has a lower settlement area and a larger dam type, and its dam height can be adjusted within a certain range, that is, the area of the settlement area can be adjusted and changed within a certain range, so that the particle size of classification can be adjusted, which is an important part in the grinding cycle. A commonly used device. And it is mainly used for ore classification with overflow particle size of 0.83mm to 0.15mm.
2). Low Dam Spiral Classifier
The low dam type is that the overflow dam is lower than the screw axis of the screw. Due to the small area of the settling area, it can only be used for washing sand ores with little mud and dewatering of coarse particles in actual production, but it is rarely used in grinding cycles.
3). Submerged Spiral Classifier
The submerged type is that there are 4-5 spiral blades at the end of the overflow dam, all of which are submerged in the pulp. There are also two types of single spiral and double spiral. The classifier has a large settlement area, a deep classification pool, and the agitation of the spiral has little effect on the surface of the pulp, so the classification surface is stable, and the overflow is large and fine. And it is used for ore classification with overflow particle size of 0.15mm to 0.07mm(What Is Spiral Classifier in Mineral Processing? | Mining Pedia, n.d.).
When it comes to sorting particles by size, not all classifiers are created equal! From wet to dry, and mechanical to hydraulic, what are the different types of classifiers that excel in various mineral processing scenarios? Share your insights!
Reference:
What Is Spiral Classifier in Mineral Processing? | Mining Pedia. (n.d.). Retrieved June 11, 2025, from https://www.miningpedia.cn/dressing/what-is-spiral-classifier-in-mineral-processing.html
