It’s not necessary to trash the environment to extract metals needed for renewable energy
January 20, 2022
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The use of renewable energy systems, such as solar panels, wind turbines, electric cars and hydrogen fuel cells, will minimize greenhouse gas emissions and reduce global warming. But use of these systems has to increase — and they require a lot of metal.
The World Bank estimates that about three billion tonnes of metals like graphite, lithium and cobalt will be needed by 2050 to supply enough systems to keep the global temperature rise below 2 C, a goal of the 2016 Paris Climate agreement. In comparison, only about one billion tonnes of metals would be needed by 2050 to satisfy current usage of renewable energy systems.
Since Canada has abundant resources of most of the metals needed, can it become a global leader in the supply of materials needed for renewable energy systems?
It could, but the increase in the physical, energy and water footprints associated with extraction of these metals to meet the metal demand could negate any gains made by the use of renewable energy systems.
Sustainability vs. fossil fuel alternatives
Some say it’s not possible to reconcile these two goals and we must make difficult choices and unfair decisions. The alternative is to find ways to adapt to global warming.
But this ignores a few things, such as the technology developments that could reduce the carbon footprint of extraction, the potential of a reorganization of the metal supply chain and the possibility of a closer relationship between society and the metals it uses.
Can we change mining technology to reduce its footprint? There is an active community of researchers that says yes. Here are some current avenues of investigation:
- Bacteria have been interacting with minerals for more than two billion years, decomposing the minerals and allowing the metals to dissolve into water. As a result, a mineral microbiome has evolved that could be used to develop natural ways of extracting metals and to clean up mine waste.
Greenhouse gas emissions at mining operations currently account for about 10 per cent of global emissions. That percentage will increase if we try to meet metals demands using current methods. Some operations are implementing renewable energy systems in efforts to further reduce this emission level.
Autonomous systems, some electrified, are in use at some mines, but there is more potential. One possibility is a large number of small machines — a swarm that behaves like an ant colony. This could enable targeted metal extraction with a far smaller footprint.
- Metal extraction generates enormous amounts of information on the actual behaviour of a mining operation. Machine learning algorithms could find patterns in these data and use them to guide improvements to the operations and increase the recovery of mineral resources.
These are big ideas that will take time to fully develop. But we believe that a reorganization of the metal supply chain and better connections between society and the metals it uses can more quickly lead to sustainable metal supply. The first step is to unwrap the mineral resources industry to make it more transparent, visible and available to anyone.
Metal supply chains
The links in the metal value chain are suppliers who perform different services.
A mining company is one collection of suppliers. But an interesting alternative is a network consisting of several sources of metals such as mines, scrap metal, electronic waste, mine tailings and wastewater — all connected to processing plants, refineries, manufacturers and the related suppliers of materials and services.
Networks within networks are possible, and flexibility is required. One network might specialize in processing tailings to extract metals, another on processing mineral concentrates and another may be solely focused on recycling metals from scrap. Ownership and operation of any part of a network would be open to a company, group or community that has the knowledge and expertise.
Many opportunities exist for the public to contribute to a flexible open metal supply network. Barriers to entry do exist, but they aren’t insurmountable, and there are advantages to removing them.
For example, in Canada, many mineral deposits are located on Indigenous lands. Parts of a network related to these mineral deposits could be operated/financed by a mining company or group of companies owned by an Indigenous community.
Some of the metals needed for renewable energy systems reside in small deposits that are geographically dispersed. Rare earth metals used in the magnets of motors in electric cars are one example. It’s too expensive to develop a mine for these deposits, but a flexible open network that uses services only as needed might be able to do economically.
Tough to separate metals
Recycling is another source of metals, but the combinations of materials in some products makes it difficult to separate the metals in them.
This calls for some innovation in processing. But the logistics of recycling are cumbersome, especially for clunky items containing metals such as an aircraft engine, an electric car or a few thousand disk drives. An open network that includes communities and logistics specialists in partnership with advanced recycling operations could be a sustainable source of metals.
Reuse or refurbishment of devices that contain metals is also possible as part of the circular economy. Co-ordination between device users and manufacturers would be required. But an open network of partnerships can accomplish this.
If we want to use renewable energy to keep the atmosphere cool, then mining processes and our current relationship with metals must change. Governments should implement policies that encourage those changes. Industry can also contribute by encouraging business partnerships and engagement with communities and other interested parties.
This article was written by W. Scott Dunbar, Professor and Head of Department of Mining Engineering, University of British Columbia; Davide Elmo, Associate Professor, Rock Mechanics, University of British Columbia; and John Steen, EY Distinguished Scholar in Global Mining Futures, University of British Columbia.
This article is republished from The Conversation under a Creative Commons license. Read the original article.