Both the BF-type and SF-type flotation machines are classified as mechanically agitated flotation equipment and are widely utilized in mineral beneficiation operations; however, they exhibit distinct differences in terms of structural design, performance characteristics, and applicable scenarios. The SF-type flotation machine employs a backward-inclined, double-sided impeller structure that integrates both slurry suction and flotation functions, enabling a dual-circulation flow within the tank. Characterized by a relatively low impeller peripheral speed, it consumes minimal energy and features wear parts with an extended service life. This equipment is frequently configured in tandem with JJF-type flotation machines to form a combined unit—typically serving as a suction cell—and is well-suited for medium-scale mineral processing circuits.

The BF-type flotation machine represents a novel device featuring an improved design based on the SF-type model. Its primary distinguishing feature lies in the adoption of a closed, double-truncated-cone impeller structure, which enhances the downward circulation capability of the slurry and effectively mitigates the sedimentation of coarse-grained minerals. The BF-type machine boasts a higher air intake capacity and lower power consumption; furthermore, it integrates a triple functionality—simultaneously performing self-suction of slurry, self-suction of air, and flotation. Consequently, it can independently constitute a complete flotation circuit without the need for auxiliary equipment, thereby facilitating streamlined process layout and operational adjustment. Additionally, the unit is equipped with an automatic slurry level control system, rendering its operation more convenient and making it particularly suitable for mineral processing operations that demand high levels of automation and separation efficiency.

In summary, the BF-type flotation machine outperforms the SF-type in terms of energy efficiency, internal circulation performance, and automation capabilities; conversely, the SF-type retains significant practical value within traditional mineral processing circuits, distinguished by its mature structural design and stable operational performance.