Aluminum casthouses are being pushed in two directions at once: they are expected to consume more post-consumer recycled metal, and to do so without losing melt quality, recovery rates or production efficiency. Zmag America's answer is to move molten metal with magnetic fields generated by permanent magnets rather than with impellers dipped into the bath, an approach the company has now carried across stirring, pumping and scrap-submergence equipment.
Why recycled charging strains conventional furnaces
Lightweight scrap, machining chips and other low-density fractions are awkward to introduce into conventional melting furnaces. Getting them under the surface, rather than letting them sit on top of the bath, is central to recovery and to the economics of recycling. The problem does not end at charging: temperature and chemical composition have to stay consistent through the bath if the cast product is to meet specification, which puts circulation and stirring equipment under pressure to move metal and heat effectively while limiting process interruptions and excessive metal loss.
Mechanical pumps, the long-standing default, depend on immersed rotating components. Those components are exposed to molten aluminum, to dross accumulation and to refractory debris, and they deteriorate. That maintenance burden is the gap the permanent-magnet route is aimed at.
Where the permanent-magnet circuit fits
Zmag's technical foundation is the industrial application of magnets and magnetic circuits. Its history runs through magnetic engineering and the commercialization of eddy-current separation for recovering non-ferrous metals from mixed material streams, before the company moved into molten-metal applications. Its patented zPMC circuit generates the field that moves the molten metal, producing circulation that the company describes as a virtual impeller, meaning movement without a conventional immersed mechanical impeller. That is the substantive difference from established electromagnetic stirring arrangements, which generate their field electromagnetically rather than from a permanent magnetic circuit.
Three product lines, three sets of documented installations
MagStir is the non-contact stirring system for melting and holding furnaces, offered in configurations for furnaces with capacities from 15 to 200 metric tons. Because it has no immersed stirring component, it adds no moving parts to the molten-metal environment. New Zealand Aluminium Smelters installed it in a casting furnace and later extended it to additional furnaces; a 2017 technical case study of those installations 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 extends the same engineering approach to pumping and circulation. It is designed to fit into a standard pump well without furnace modification, uses no physical impeller, and is marketed as a nearly hands-free option with no consumable parts and minimal downtime. At the TANDEM Division of TST Inc. in Fontana, California, it replaced an existing mechanical pump in a production furnace for a seven-week trial. The reported findings were smooth operation and reduced disturbance to the molten-metal surface; plant management also said the system avoided the splashing experienced with conventional pumping as the metal level fell during draining. The technology was presented at the TMS 2023 Annual Meeting and Exhibition, where its use in side-well, multi-chamber furnaces was discussed alongside potential roles in gas injection and scrap submergence.
Typhoon targets the hardest material: lightweight scrap and machining chips. Its magnetic circuit produces a vortex-like movement that draws material beneath the surface, supporting heat exchange and recovery during remelting. At Neuman Aluminium's Marktl facility in Austria, a Typhoon chip-submergence system was incorporated into a furnace modernization project aimed at low-density post-consumer scrap, including fractions with a bulk density of roughly 375 kg/m³ that had been difficult to charge and melt conventionally. Neuman had set a target of one metric ton per hour while continuing to melt solid charge materials in the same furnace; in operation the system processed almost twice the planned scrap quantity within the expected time without disrupting normal furnace operations, with low operator involvement and, the company reported, no negative impact on melt or finished-product quality. Published figures put the system at 5-15 kW including its air-cooling blower, with capacity to submerge up to five metric tons per hour of machining chips and adjustable vortex intensity.
Adoption, not concept, is the constraint
In an August 2025 interview with AL Circle, Zmag America president Eishin Takahashi identified limited familiarity with the technology as a barrier to wider adoption in the United States, observing that aluminum producers globally tend to be conservative and more comfortable with equipment and processes they already know. That is a commercial obstacle rather than a technical one, and it shapes how the reference installations should be read: each one is a step in building familiarity rather than proof of a settled market position.
A crowded field, but not a like-for-like one
Furnace stirring, molten-metal circulation and scrap submergence already have established suppliers. ABB's AL-EMS electromagnetic stirring system for melting, holding and alloying furnaces reports more than 430 installations and, in April 2026, a further order from Arconic for a fifth stirrer at its Hungarian casthouse. Presezzi Extrusion Group's Melting Technology division offers the L.E.C. low-energy-consumption stirrer for melting and holding furnaces alongside remelting and complete casthouse equipment. Pyrotek covers electromagnetic pump systems for circulation and metal transfer as well as its LOTUSS low-turbulence scrap submergence technology, which uses a circulation pump and refractory well; its UK operation EMP Technologies Ltd. designs, sells and installs electromagnetic pump melting and circulation systems. Rockwell Automation sits in the adjacent industrial automation segment, supplying furnace and ladle-shop control systems, as in its modernization work for Mozal Aluminium, rather than a permanent-magnet stirring product. The offerings overlap in function, but they are not all direct equivalents.
What the record does and does not show
The reported results are customer and company accounts from individual installations, including a seven-week trial; they are not independent benchmarks, and no comparative economics, energy consumption or maintenance costs are disclosed here. The scale of the claims is also bounded: furnaces up to 200 metric tons for MagStir, and up to five metric tons per hour of chips for Typhoon. Permanent-magnet systems still require careful magnetic circuit design and integration with a given furnace. Whether the non-contact argument pays off depends on the scrap mix, the furnace type and the cost of the downtime it removes.
The direction of travel, though, is clear enough. As producers push more difficult recycled feedstock through their furnaces, managing molten-metal movement without relying on immersed mechanical components is likely to become an increasingly relevant consideration.