Rare Earth elements (REE)Demand for Rare-Earth Metals Is Skyrocketing, So We’re Creating a Safer, Cleaner Way to Recover Them from Old Phones and Laptops
Rare-earth metals are critical to the high-tech society we live in as an essential component of mobile phones, computers and many other everyday devices. But increasing demand and limited global supply means we must urgently find a way to recover these metals efficiently from discarded products.
Rare-earth metals are critical to the high-tech society we live in as an essential component of mobile phones, computers and many other everyday devices. But increasing demand and limited global supply means we must urgently find a way to recover these metals efficiently from discarded products.
Rare-earth metals are currently mined or recovered via traditional e-waste recycling. But there are drawbacks, including high cost, environmental damage, pollution and risks to human safety. This is where our ongoing research comes in.
Our team in collaboration with the research centre Tecnalia in Spain has developed a way to use environmentally friendly chemicals to recover rare-earth metals. It involves a process called “electrodeposition”, in which a low electric current causes the metals to deposit on a desired surface.
This is important because if we roll out our process to scale, we can alleviate the pressure on global supply, and reduce our reliance on mining.
The Increasing Demand for Rare-Earth Metals
Rare-earth metals is the collective name for a group of 17 elements: 15 from the “lanthanides series” in the periodic table, along with the elements scandium and yttrium. These elements have unique catalytic, metallurgical, nuclear, electrical, magnetic and luminescent properties.
The term “rare” refers to their even, but scarce, distribution around the world, noted after they were first discovered in the late 18th century.
These minerals are critical components of electronic devices, and vital for many green technologies; they’re in magnets for wind power turbines and in batteries for hybrid-electric vehicles. In fact, up to 600 kilograms of rare-earth metals are required to operate just one wind turbine.
The annual demand for rare-earth metals doubled to 125,000 tonnes in 15 years, and the demand is projected to reach 315,000 tonnes in 2030, driven by increasing uptake in green technologies and advancing electronics. This is creating enormous pressure on global production.
Can’t We Just Mine for More Rare Metals?
Rare-earth metals are currently extracted through mining, which comes with a number of downsides.
First, it’s costly and inefficient because extracting even a very small amount of rare earth metals requires large areas to be mined.
Second, the process can have enormous environmental impacts. Mining for rare earth minerals generates large volumes of toxic and radioactive material, due to the co-extraction of thorium and uranium — radioactive metals which can cause problems for the environment and human health.
Third, most mining for rare-earth metals occurs in China, which produces more than 70% of global supply. This raises concerns about long-term availability, particularly after China threatened to restrict its supply in 2019 during its trade war with the US.
E-Waste Recycling Is Not the Complete Answer
Through e-waste recycling, rare-earth metals can be recovered from electronic products such as mobile phones, laptops and electric vehicles batteries, once they reach the end of their life.
For example, recovering them from electric vehicle batteries involves traditional hydrometallurgical (corrosive media treatment) and pyrometallurgical (heat treatment) processes. But these have several drawbacks.
Cristina Pozo-Gonzalo is Senior Research Fellow, Deakin University.This article is published courtesy of The Conversation.
