Recycling Using Microwaves Could Help The U.S. Reclaim Rare Materials From E-Waste

A new method of recycling using microwaves could help recover valuable materials from e-waste more safely and affordably.

Every year, Americans toss out millions of old phones, laptops, and TVs. But while metals like steel, aluminum, and copper are easily recycled, smaller valuable materials like gallium, indium, and tantalum often end up in landfills. A new method using microwave technology could change that.

Researchers at West Virginia University are developing a process that uses microwaves to recover these hard-to-reach materials from electronic waste. The technique promises a cleaner, safer, and cheaper way to recycle components that are essential to modern technology but expensive and mostly controlled by foreign countries.

Electronic waste is one of the fastest-growing waste streams in the U.S. In 2018, Americans produced about 2.7 million tons of it, according to the Environmental Protection Agency. Yet only about 15% was properly recycled, a United Nations survey found.

Even worse, nearly half the e-waste collected in North America is sent overseas. There, workers often use dangerous techniques like burning or soaking parts in toxic chemicals to recover valuable metals. These unsafe methods harm both workers and the environment, which is why they are restricted in the U.S.

Inside most discarded electronics are small amounts of rare elements called “critical materials.” These include:

• Indium, used in touchscreen displays
  
• Gallium, found in LED lights
  
• Tantalum, important for energy storage in capacitors
  

While these materials are found in tiny amounts, they’re crucial for building new technology. And they’re hard to replace.

The U.S. Department of Energy labels certain minerals as “critical” because they’re essential for industry and national defense, yet have unstable supply chains. Gallium, indium, and tantalum all fall into this category.

Right now, the U.S. imports most of these materials. Countries like China dominate the global supply. That makes the U.S. vulnerable to supply disruptions, trade restrictions, or price hikes.

Prices for these materials reflect their scarcity. In 2024, gallium ranged from $220 to $500 per kilogram—about 50 times more expensive than copper.

Recovering these materials could reduce the need for mining and help the U.S. build a reliable domestic supply. But current recycling methods are either too toxic or too expensive to make practical.

That’s where the new method comes in. At West Virginia University, researchers are testing a new way to reclaim critical materials using microwaves.

It starts by shredding the electronics into small pieces and mixing them with special additives called fluxes. These additives trap unwanted substances. Then, the mixture is exposed to microwaves.

Unlike cooking in a kitchen microwave, this system targets carbon, not water. The carbon comes from the plastic and glue in electronic parts. When hit with microwaves, the carbon heats up quickly, hot enough to trigger chemical reactions with the surrounding critical materials.

The result is a sponge-like lump of pure metal about the size of a grain of rice. These small nuggets can then be filtered and collected.

In lab tests, the researchers have recovered up to 80% of the critical materials, at 95% to 97% purity.

This approach avoids the need for harsh chemicals and makes recycling using microwaves both safer and more energy-efficient than current methods.

The research began with funding from the U.S. Department of Defense’s DARPA program. While the Department of Defense doesn’t use large volumes of critical materials, it depends on them for technologies like radar and nuclear systems. That makes a steady domestic supply a national security issue.

The next step is scaling up. The team plans to test the technology on larger items like smartphone circuit boards, LED parts, and server components. Their goal: build a system that can process tons of e-waste per hour.

At full scale, this method could recover up to 50 pounds of critical materials per ton of e-waste. That would make recycling using microwaves a major tool in closing the supply gap.

For this technology to make a big impact, a few things need to happen:

• Policy updates: Lawmakers could require electronics companies to take responsibility for recycling their products.
  
• Closing loopholes: Banning the export of e-waste for unsafe overseas processing would keep valuable materials in the U.S.
  
• Economic incentives: As the microwave process becomes more affordable, more recyclers may adopt it.

The biggest shift may come from economics. Once it becomes profitable to recover these critical specks, the market will respond.

Recycling using microwaves could help the U.S. turn its growing piles of e-waste into a valuable resource. It’s a safer, cleaner, and smarter way to reclaim the essential materials that power modern life.