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sales@pumpkingmech.com06 November 2025
Field notes from Hebei: I spent last week in Beisu Industrial Park, Wuji County, Shijiazhuang, where a lot of slurry gear is made, and one unit kept coming up in conversations with plant managers—the Vertical Froth Pump. Specifically Kingmech’s VFD Vertical Froth Pump (Repalce AF). It’s designed for flotation cells where air-laden slurry can make ordinary pumps cough, stall, or—annoyingly—air-lock.
Trends? Plants are debottlenecking flotation circuits and pushing higher air volume fractions. The response from makers like Kingmech has been bigger inlets, steep “froth-friendly” volutes, and open impellers that don’t mind entrained air. Add a VFD and you can trim speed to match froth stability—operators like that. Many customers say this design simply refuses to air-lock once it’s primed, which, to be honest, is half the battle in rougher/scavenger duties.
Origin: Beisu Industrial Park, Wuji County, Shijiazhuang City, Hebei Province. Materials offered: Cr27, Cr28 high-chrome, and CD-4MCu duplex. Size range: 2–8 inches, ≈7–570 m³/h, head ≈5–25 m (real-world use may vary with slurry SG, air content, and sump conditions).
| Spec | VFD Vertical Froth Pump (Repalce AF) |
|---|---|
| Size | 2–8 in |
| Capacity | ≈7–570 m³/h |
| Head | ≈5–25 m |
| Materials | Cr27 / Cr28 (ASTM A532) or CD-4MCu (ASTM A890) |
| Drive | VFD-ready, TEFC motor recommended |
| Max solids | Up to ≈8 mm (depends on impeller) |
| Air handling | High froth tolerance; anti-airlock inlet geometry |
| Test acceptance | ISO 9906 / HI 14.6 (Grade 2B typical) |
Copper rougher/scavenger cells, phosphate and potash flotation, coal froth transfer, nickel/PGM concentrators, and any sump that burps air. In short: if froth is thick and temperamental, a Vertical Froth Pump usually pays for itself in uptime.
Materials are cast to ASTM A532 (Cr27/Cr28) or ASTM A890 (CD‑4MCu), heat-treated, CNC machined, and dynamically balanced (G6.3 typical). Hydraulics are hydro-tested to ISO 9906 / ANSI/HI 14.6. Wear parts get QA hardness checks (≈58–65 HRC for high-chrome). Service life? I’ve seen 6–18 months on abrasive duty; softer ores do better. Final assembly includes run-in on water; some customers request slurry mock-ups—worth it if your froth is notorious.
| Vendor | Strengths | Considerations |
|---|---|---|
| Kingmech (VFD model) | Value-for-performance, flexible metallurgy, responsive customization from Hebei base. | Lead times vary for special alloys; specify test grade early. |
| Global Brand A | Broad service network, long field history. | Premium pricing; some models less flexible on materials. |
| Global Brand B | High-efficiency hydraulics, strong documentation. | Spare parts costs; customization windows limited. |
Operators told me the Vertical Froth Pump kept head loss under ≈8% at 15–20% air volume fraction during a week-long trial—pretty decent. One copper concentrator in Inner Mongolia swapped legacy AF-type units for the VFD version and reported a 12–18% reduction in sump overflow events and longer intervals between impeller changes (from 4 to ≈6 months). Not a lab test, but convincing.
- Test acceptance to ISO 9906 or ANSI/HI 14.6 (agree the grade up front).
- Material certs to ASTM A532 (Cr irons) or ASTM A890 (duplex).
- Factory QMS typically ISO 9001; CE marking available on request (project-dependent).
Citations:
1) ISO 9906: Rotodynamic pumps—Hydraulic performance acceptance tests.
2) ANSI/HI 14.6: Rotodynamic pumps for hydraulic performance acceptance tests (Hydraulic Institute).
3) ASTM A532/A532M: Abrasion-Resistant White Iron Castings (Cr27/Cr28).
4) ASTM A890/A890M: Castings, Iron-Chromium-Nickel-Molybdenum (CD‑4MCu) Duplex Stainless.
