Apple is gradually accumulating a legendary portfolio of patents related to material sciences, with a recent patent filing describing a cheaper, more efficient process to recover pure aluminum from its scrapped alloy state.
Apple's patent application describes a process that recovers pure aluminum from a scrapped heap at temperatures as low as 125 degree Celsius
Traditional methods of recovering pure aluminum from its alloys, such as the Hoopes process, are generally energy- and capital-intensive, diminishing the underlying economic rationale.
Apple, however, has now applied to patent a new aluminum recovery method, one that involves electrorefining in conjunction with a low-melting-temperature molten salt.
Unlike traditional fractional solidification methods that struggle to remove some common elements found within aluminum alloys, Apple's electrorefining process, which involves an aluminum chloride-based molten electrolyte salt, "may operate below 200° C, below 150° C, below 125° C and, in some variations, even lower."
The basics of this process are quite familiar: a scrap aluminum alloy anode and a purified aluminum cathode are placed within an electrochemical cell containing an aluminum chloride-based molten electrolyte salt. When an electric current is applied, aluminum from the scrap alloy is oxidized into aluminum ions in the molten salt, then reduced back into aluminum metal at the purified aluminum cathode.
Apple's approach, however, includes a number of innovations. Firstly, this "method does not require engineering the process around the density of a molten scrap aluminum layer," which means the scrap aluminum anode can take various forms, including foil, sheet, ingots, compressed CNC machining chips, or combinations of these forms.
You can also aggregate multiple scrap sources, either melted into a homogeneous average composition or combined through solid-state bonding, compressing or joining without melting, resulting in unprecedented flexibility.
Secondly, this process need not continue uninterrupted till its conclusion, and may be paused or throttled, based on the available energy levels and pricing variability between peak and off-peak hours.
Of course, the core innovation involves the aluminum chloride-based molten salt, which may be combined with chloride additives or dopants, such as sodium chloride, potassium chloride, or magnesium chloride, to lower the melting point of the molten salt mixture and disrupt the formation of structure-altering dendrites at the electrodes.
The system can be scaled by using multiple scrap aluminum anodes and their respective pure aluminum cathodes. Even so, the system has to be sealed to prevent molten salt components from evaporating away.
So, the aluminum chloride-based electrolyte unlocks operational temperatures that are far below traditional aluminum-melting temperatures. "The ability to use scrap in forms such as compressed CNC chips is also important. Apple’s own manufacturing ecosystem likely generates high-quality machining scrap, and a purification process that can handle those scrap forms could improve closed-loop material recovery."
Given the fact that Apple's MacBook Neo is already made from recycled aluminum, it might not be too far-fetched to assume future iterations leveraging this process to eke out additional cost savings, especially for a device where every dollar matters.
About the author: Writing is my one incontrovertible passion. Over the past six years, he has authored over 2,200 distinct articles on financial and tech-related topics, spanning nearly 1 million words. And he has been a member of Wcctech mobile team since 2025. As an alumnus of the University of Toronto, Rotman Commerce Program, I bring nuance, in-depth knowledge, and a unique perspective to every topic that I cover. When I'm not writing, I'm traveling the world, exploring hidden confectionaries and restaurants as an aspiring food connoisseur.
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