The Warman AHF Series is a heavy-duty centrifugal pump specifically engineered for challenging high-air, high-viscosity frothy slurries in mining flotation processes. When pumping concentrates or middlings containing frothing agents, conventional slurry pumps are highly susceptible to "air lock" and flow interruption caused by gas accumulation. The AHF Series, however, completely resolves this industry pain point through its innovative structural design.
Three Core Design Features
1. Forced Feeding (Inducer Impeller):
Special inducer vanes extend from the front of the impeller, complemented by an oversized impeller eye. These vanes act like an auger, forcibly drawing viscous froth into the pump chamber. The powerful centrifugal force then mechanically shears and breaks down the bubbles, fundamentally eliminating air lock.
2. Oversized Sloping Suction Inlet:
The inlet diameter is significantly larger than that of conventional slurry pumps with equivalent flow rates. Combined with a sloping flow path design, this effectively reduces feed velocity and resistance, ensuring smooth entry of highly expansible frothy slurries.
3. Modular Drop-in Upgrade (Interchangeable with AH Series):
The AHF Series is developed on the renowned Warman AH slurry pump platform, sharing identical bearing assemblies, frames, and baseplate dimensions with the AH Series. Existing AH pumps at mining sites can be upgraded in place without any modifications to site piping or civil foundations—simply replace the front liner, cover liner, and froth impeller.
Core Model List and Basic Parameters
The model designation of the AHF Series directly corresponds to its discharge diameter (in inches) and the associated bearing frame code (e.g., 6F-AHF indicates a 6-inch discharge with an F-frame heavy-duty bearing assembly). The inlet diameter is typically one to two sizes larger than the discharge.
Material Construction & Shaft Seal
Wetted Parts Materials: Options include ultra-high chromium white iron (e.g., Ultrachrome A05) and heavy-duty wear-resistant natural/synthetic rubber (e.g., R55). Since flotation concentrates are typically fine-particle slurries, high-resilience rubber liners offer longer service life in resisting erosion and chemical attack from flotation reagents.
Heavy-Duty Bearing Assembly: The design features a large-diameter short-shaft cantilever configuration and a cartridge-type bearing assembly, providing exceptional rigidity to easily withstand violent radial shocks caused by intermittent froth flow.
Shaft Seal Options: Options include an expeller-type dynamic seal (achieving zero sealing water and zero leakage during operation), a cartridge mechanical seal, or conventional gland packing.
Typical Applications
Metal Mining Flotation Circuits: Conveying rougher concentrates and cleaner circuit middlings in flotation processes for copper, gold, molybdenum, lead-zinc, nickel, and other metal ores.
Coal and Non-Metal Mining: Pumping high-viscosity frothy slurries in coal slime flotation systems, as well as in phosphate and potash flotation processes.
