CRITICAL MINERALSCritical Minerals Don’t Belong in Landfills – Microwave Tech Offers a Cleaner Way to Reclaim Them from E-waste
E-waste recycling focuses on retrieving steel, copper, aluminum, but ignores tiny specks of critical materials. Once technology becomes available to recover these tiny but valuable specks of critical materials quickly and affordably, the U.S. can transform domestic recycling and take a big step toward solving its shortage of critical materials.
When the computer or phone you’re using right now blinks its last blink and you drop it off for recycling, do you know what happens?
At the recycling center, powerful magnets will pull out steel. Spinning drums will toss aluminum into bins. Copper wires will get neatly bundled up for resale. But as the conveyor belt keeps rolling, tiny specks of valuable, lesser-known materials such as gallium, indium and tantalum will be left behind.
Those tiny specks are critical materials. They’re essential for building new technology, and they’re in short supply in the U.S. They could be reused, but there’s a problem: Current recycling methods make recovering critical minerals from e-waste too costly or hazardous, so many recyclers simply skip them.
Sadly, most of these hard-to-recycle materials end up buried in landfills or get mixed into products like cement. But it doesn’t have to be this way. New technology is starting to make a difference.
As demand for these critical materials keeps growing, discarded electronics can become valuable resources. My colleagues and I at West Virginia University are developing a new technology to change how we recycle. Instead of using toxic chemicals, our approach uses electricity, making it safer, cleaner and more affordable to recover critical materials from electronics.
How Much E-waste Are We Talking About?
Americans generated about 2.7 million tons of electronic waste in 2018, according to the latest federal data. Including uncounted electronics, a survey by the United Nations suggests that the U.S. recycles only about 15% of its total e-waste.
Even worse, nearly half the electronics that people in Northern America sent to recycling centers end up shipped overseas. They often land in scrapyards, where workers may use dangerous methods like burning or leaching using harsh chemicals to pull out valuable metals. These practices can harm both the environment and workers’ health. That’s why the Environmental Protection Agency restricts these methods in the U.S.
The Tiny Specks Matter
Critical minerals are in most of the technology around you. Every phone screen has a super-thin layer of a material called indium tin oxide. LEDs glow because of a metal called gallium. Tantalum stores energy in tiny electronic parts called capacitors.
All of these materials are flagged as “high risk” on the U.S. Department of Energy’s critical materials list. That means the U.S. relies heavily on these materials for important technologies, but their supply could be easily disrupted by conflicts, trade disputes or shortages.
