The future of urban life may be quieter and cleaner, yet it faces a hidden challenge. By 2040, it’s predicted that 60% of vehicles globally will be electric, significantly reducing pollution and noise. However, this shift introduces another issue: an overwhelming increase in mining waste.
The electric vehicle revolution depends heavily on lithium, a key component in battery production. In 2023, the industry produced a staggering 1.8 million tonnes of lithium waste, most of which ended up in landfills.
Concurrent with this, the construction sector grapples with its own environmental concerns. The massive consumption of concrete annually is sufficient to encircle the globe twice. Portland cement, a primary concrete component, contributes to nearly 8% of global carbon emissions, and cleaner alternatives are dwindling.
Though these issues might seem disconnected, a common solution exists: repurposing lithium mining waste for low-carbon cement production.
The Overlooked Consequence of Lithium Mining
Since their invention in the 1970s, lithium-ion batteries have transformed energy use worldwide, with their market value projected to exceed US$400 billion as electric vehicle uptake increases.
Lithium is not found as a pure element and must be extracted from minerals or brines, primarily located in the “lithium triangle” of Chile, Argentina, and Bolivia, containing over 60% of global reserves.
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The extraction process is inefficient, generating approximately nine to ten tonnes of waste per tonne of lithium carbonate. With the push to meet climate goals, lithium demand could triple by 2030.
The UK aims to establish new extraction facilities in areas like Cornwall and the northeast, according to the UK government’s strategy.
Read more:
As mining returns to Cornwall, lithium ambitions tussle with local heritage
This waste, however, holds potential. Lithium mining byproducts are rich in compounds like silicates, alumina, and calcium oxides, essential for cement hardening. Thus, lithium waste could contribute to sustainable development.
Research is underway at Cardiff University to determine if UK lithium waste can substitute cement in concrete.
The premise is straightforward: if lithium waste can function as a supplementary binder, it could significantly reduce conventional cement usage and cut emissions by up to 50%. Yet, extensive scientific evaluation is necessary.
Ongoing studies are examining the microstructure, chemical interactions, and durability of these waste-based concretes, progressing from lab experiments to real-world trials. “Lithicrete” may soon offer the UK a method to utilize lithium industry waste in eco-friendly construction.
The concrete sector has long attempted to diminish Portland cement dependence by incorporating fly ash and slag. However, these alternatives are dwindling as traditional industries evolve, leading to a potential shortage that could impede decarbonization efforts.
As such, the search for new materials is urgent. Given its abundance and chemical compatibility with cement, lithium mining waste offers a timely solution as the industry faces resource constraints.
The Significance
The environmental implications are substantial. Concrete forms the foundation of infrastructure, from homes to bridges. As demand grows, reducing emissions from clinker and adopting alternative binders could achieve 20% of the necessary sector reductions by 2050.
Utilizing lithium waste in concrete could potentially lower emissions, decrease landfill usage, and enhance the UK’s sustainability by reducing reliance on imported materials. This approach ensures the shift to electric vehicles doesn’t simply transfer environmental challenges elsewhere.
The transition to eco-friendly technology must be circular. We propose that instead of allowing green advancements to create further issues, materials should be reutilized, maintaining their utility within the system.
Original Story at theconversation.com