How to Select the F Series Spiral Classifier

Classification is a crucial preparatory process in mineral processing. The conditions and outcomes of classification operations directly impact the performance metrics of subsequent operations in a mineral processing plant. Among the various classification equipment used in mineral processing, the spiral classifier is one type. Commonly referred to as a grading screen or screening machine, the spiral classifier is a mineral processing apparatus. It employs mechanical classification based on the principle that solid particles with differing specific gravities settle at varying speeds within a liquid medium. This equipment filters the powder produced by grinding mills, returning coarse material via spiral blades to the mill's feed inlet while discharging filtered fine particles through an overflow pipe. The F-series spiral classifier is primarily used for pre-classification and check classification in grinding circuits during mineral processing and aggregate production, as well as for desliming and dewatering in sand washing operations.

The F-series spiral classifier consists of a drive unit, a spiral (left- or right-handed), a trough, a lifting mechanism, a lower support, and a feed inlet. The trough is installed at an incline angle determined by equipment configuration in the process flow. The drive mechanism rotates the spiral within the trough. Finely ground slurry enters the trough through the side feed inlet, forming a slurry settling zone at the lower end. The surface area and volume of this zone are determined by the trough inclination angle and the height of the overflow weir. The low-speed rotating spiral provides agitation. After mixing, light and fine particles suspend at the top to form the overflow, which discharges through the weir at the tank end into the next mineral processing stage. Coarse and heavy particles settle at the tank bottom as return sand, transported by the spiral to the discharge outlet.

F Series Spiral Classifiers are categorized by the number of spiral blades: Single-Spiral Classifiers and Double-Spiral Classifiers.

The F Series spiral classifiers can be further categorized based on the immersion depth of the overflow-end spiral blades relative to the overflow surface:

1. High-Weir Type: The top of the overflow-end spiral blades extends above the overflow surface, while the center of the overflow-end spiral lies below the overflow surface. Primarily used for classifying ore with an overflow particle size of 0.83-0.15 mm.

2. Submerged Type: The overflow-end spiral blades are fully submerged below the overflow surface. Primarily suitable for classifying ore with an overflow particle size of 0.15-0.07mm.

This spiral classifier is widely applicable in mineral processing plants for closed-circuit circuit classification and flow separation of ore sand in conjunction with ball mills. It is also used in gravity separation plants for classifying ore sand and fine slime, as well as for particle size classification of pulp in metal ore processing flows. Additionally, it serves in desliming and dewatering operations during ore washing. It features a simple structure, reliable operation, and convenient handling.

(Technical parameters and data mentioned herein may be updated with product upgrades. Click website customer service for the latest equipment specifications.)

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