Aluminum casthouses are under pressure to use more post-consumer recycled aluminum without sacrificing melt quality, recovery rates or production efficiency. Lightweight scrap, machining chips and other low-density materials are difficult to introduce into conventional melting furnaces, and once charged, the bath must maintain consistent temperature and chemical composition. Those requirements make scrap feeding, submergence, circulation and stirring central to recycling performance rather than peripheral equipment choices.
Zmag America, Ltd. is positioning a family of permanent-magnet systems around those tasks. The company traces its roots to industrial magnetic engineering and the commercialization of eddy-current separation, which recovers non-ferrous metals from mixed material streams. It later expanded into molten-metal applications and developed its patented zPMC permanent magnetic circuit. Rather than relying on a conventional electromagnetic stirring arrangement, zPMC uses a permanent magnetic circuit to generate the field that moves molten aluminum. Zmag describes the resulting motion as a virtual impeller because circulation can be produced without an immersed mechanical impeller.
Familiarity remains an adoption barrier
In an interview, Eishin Takahashi, president of Zmag America, identified limited familiarity with the technology as one barrier to wider adoption in the United States. He observed that aluminum producers globally tend to be conservative and more comfortable with equipment and processes they already know. That comment frames the commercial challenge for permanent-magnet systems: the technical proposition must be understood alongside established mechanical and electromagnetic alternatives.
MagStir targets temperature and composition uniformity
MagStir is a non-contact stirring system for aluminum melting and holding furnaces. It uses the permanent magnetic circuit to create movement in the molten bath and support homogenization of temperature and alloy composition. Zmag offers configurations for furnaces with capacities from 15 to 200 metric tons. Because the system does not require an immersed mechanical stirring component, it is presented as a way to improve melt circulation without adding moving parts to the molten-metal environment.
The application record extends beyond the United States. New Zealand Aluminium Smelters installed MagStir in a casting furnace and later extended its use to additional furnaces. A 2017 technical case study examined those installations and reported improvements in temperature control during furnace preparation. A MagStir unit was also fitted to a casthouse furnace at Rio Tinto-operated Boyne Smelters in Queensland, Australia, in 2019.
MagPump replaces a mechanical pump in a trial
MagPump applies the same magnetic-engineering approach to molten-metal pumping and circulation. It is designed to fit a standard pump well without furnace modification. Unlike conventional mechanical pumps, it has no physical impeller. Zmag markets it as a nearly hands-free alternative with no consumable parts and minimal downtime.
At the TANDEM Division of U.S. secondary aluminum producer TST Inc. in Fontana, California, MagPump replaced an existing mechanical pump during a seven-week trial. The reported findings described smooth operation and reduced disturbance of the molten-metal surface. TST plant management also said the system avoided the splashing seen with conventional pumping arrangements as the furnace metal level fell during draining. The technology was presented at the TMS 2023 Annual Meeting and Exhibition in connection with side-well, multi-chamber furnaces. That presentation discussed potential uses including gas injection and scrap submergence alongside its primary circulation role.
Typhoon addresses low-density scrap
Typhoon focuses on scrap submergence and chip melting. The system is designed to introduce lightweight aluminum scrap and machining chips beneath the molten-metal surface instead of leaving them at the top of the bath. Its magnetic circuit generates vortex-like movement that draws material into the melt and supports heat exchange and recovery during remelting.
Neuman Aluminium's Marktl facility in Austria provides a recent example. Neuman incorporated a Typhoon chip-submergence system into a furnace modernization project intended to expand processing of low-density post-consumer scrap. The targeted material included lightweight fractions with a bulk density of about 375 kg/m³, which had been difficult for conventional furnace charging and melting.
The operating results exceeded the initial expectations, according to the published account. Neuman set a target of processing one metric ton per hour while continuing to melt solid charge in the same furnace. The Typhoon system processed almost twice the planned scrap quantity within the expected time without disrupting normal furnace operations. The company also reported low operator involvement and no negative impact on melt or finished-product quality. Typhoon operates at 5 to 15 kW, including its air-cooling blower, and can submerge up to five metric tons per hour of machining chips. Its vortex intensity can be adjusted to suit operating requirements and to maintain molten-metal movement when scrap or alloying material is not being charged.
A competitive technology landscape
The market for furnace stirring, molten-metal circulation and scrap-submergence equipment includes established suppliers, but their offerings are not all direct equivalents to Zmag's permanent-magnet approach. ABB supplies the AL-EMS electromagnetic stirring system for aluminum melting, holding and alloying furnaces and reports more than 430 installations. In April 2026, ABB announced an additional order from Arconic for a fifth stirrer at its Hungarian casthouse, following earlier installations at the same site.
Presezzi Extrusion Group, through its Melting Technology division and North American presence, offers the L.E.C. Low Energy Consumption Stirrer for melting and holding furnaces, along with equipment for aluminum remelting and complete casthouse operations. Pyrotek has a broader casthouse equipment presence. Its electromagnetic pump systems circulate molten aluminum and support metal transfer and scrap charging, while its LOTUSS technology uses a circulation pump and refractory well to submerge lightweight scrap. Pyrotek's UK operations include EMP Technologies Ltd., which designs, sells and installs metal-melting and circulation systems incorporating electromagnetic pumps. Rockwell Automation operates in the adjacent industrial automation segment rather than offering a like-for-like permanent-magnet stirring product; its aluminum-sector work includes furnace and ladle-shop control systems, as shown by a modernization project for Mozal Aluminium's casthouse operations.
What the cases show, and what they do not
The common thread is not simply replacing one pump with another. It is removing immersed mechanical components from the molten-metal environment while still producing the circulation needed for heat transfer, composition control and scrap recovery. For casthouses adding lightweight recycled feed, that combination is relevant because charging alone is not enough: the material must be drawn into the melt and distributed through the bath.
The evidence presented by Zmag and its customers is encouraging but bounded. The MagStir installations and the TST trial indicate that permanent-magnet circulation can operate in production settings, and the Neuman results show that a chip-submergence system can exceed a stated scrap-processing target without reported quality damage. Those are case-specific findings, not a universal comparison with mechanical or electromagnetic equipment. Adoption will still depend on furnace design, scrap mix, operating practice and the willingness of producers to move beyond familiar equipment, the barrier Takahashi highlighted. The available record does not establish long-run maintenance costs, energy use across all products or performance across every casthouse configuration. On the available record, permanent-magnet engineering is best understood as a credible alternative for specific molten-metal tasks, with its value determined by integration and plant-specific validation.