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International Research Presents An Innovative Method That Transforms Submarine Mining Using Green Hydrogen In The Processing Of Minerals To Reduce Environmental Impacts And Enhance Sustainability
A new ecological technique using green hydrogen for processing metal nodules in deep waters was presented by international researchers, as announced by the Technological Innovation portal this Monday (01).
The method, presented in the new study, uses cleaner chemical principles to handle materials collected from the ocean floor, proposing an alternative to traditional submarine mining, often associated with significant environmental impacts.
The technique aims to improve efficiency and sustainability in the production of metals, reducing ecological risks and paving the way for a more aligned approach to sustainability, especially in a scenario of increasing global demand for metals essential to the energy transition.
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The Technological Advancement In Submarine Mining
Mineral exploration in deep waters has intensified due to the global need for metals such as nickel, copper, manganese, and cobalt — essential elements for batteries, wind turbines, electric cars, and energy storage systems. While economic interest grows, the risks associated with marine ecosystems also become more evident.
In deep waters, organisms such as sponges, sea cucumbers, cold corals, and endemic species inhabit extremely sensitive regions. According to research cited by international institutions, these ecosystems can take centuries to form and, therefore, physical disturbance can have irreversible consequences.
That is precisely why any advancement that reduces physical or chemical damage during submarine mining is considered strategic, both environmentally and economically.
How The New Ecological Technique With Green Hydrogen Works
A Canadian company specializing in deep-sea mining, Metals Company, is in the process of negotiating a license that would allow it to explore metals on the seabed. The method currently considered by the company uses fossil fuels — specifically coke and methane — to perform thermal processing of the polymetallic nodules collected from the ocean.
According to Metals Company itself, the technique would result in the release of approximately 4.9 kilograms of carbon dioxide for each kilogram of valuable metals obtained. However, Brazilian researcher Isnaldi Souza Filho and his team from the Max Planck Institute identified a way to reduce these emissions by eliminating one of the heating stages.
The innovation consists of crushing the nodules and turning them into pellets, which can be placed directly in a modified arc furnace. Within this equipment, an atmosphere composed of hydrogen and argon is formed. High-energy electrons released by an electrode pass through the furnace and interact with the hydrogen gas, stripping electrons from its molecules and forming a plasma capable of reaching temperatures exceeding 1,700 °C.
In this environment, the hydrogen ions present in the plasma react with the oxygen contained in the pellets, breaking down metal oxides and leaving only pure metal. The process generates few byproducts: in addition to the water resulting from the chemical reactions, only manganese oxide and manganese binders are produced, materials that can be used in battery manufacturing and also in the steel industry.
Integration With Green Hydrogen And Energy Transition
One of the highlights in the global context is the potential use of green hydrogen as an energy source for pumping, processing, and electrolysis systems associated with deep-sea mining.
Since green hydrogen is produced by the electrolysis of water using renewable energies, its application reduces emissions and strengthens the proposal for a sustainable production chain. Several countries, including Brazil, are already studying ways to integrate green hydrogen into energy-intensive industrial processes.
Therefore, combining an ecological mineral processing technique with a clean energy matrix could represent a significant advance towards sustainability in the sector.
The Global Context And Associated Environmental Impacts
Submarine mining raises concerns due to various factors:
- formation of sediment plumes that can spread for kilometers;
- suffocation of benthic organisms;
- alteration of habitats that took centuries to develop;
- release of heavy metals and microscopic particles into the water column;
- underwater noise that affects cetaceans and other sensitive species.
Researchers warn that many of these impacts are still poorly understood. Thus, scaling up operations without scientific understanding could result in long-term damage.
The International Seabed Authority (ISA) has been discussing rules for mining in international waters since 2021. However, even in 2025, many countries still advocate for a global moratorium until more comprehensive and reliable studies are available.
The new ecological technique emerges precisely at this moment of uncertainty, offering a less destructive exploration alternative, although it still depends on clear regulations and rigorous scientific monitoring.
Sustainable Mining: Opportunities And Limitations
The metals found in polymetallic nodules are essential for expanding sectors such as:
- electric mobility;
- energy storage;
- solar panels;
- wind turbines;
- high-performance electronics.
Thus, a technique that allows the extraction of these resources with less environmental impact could strengthen the global clean energy chain.
Despite the promises, some challenges remain:
- high operational costs in deep waters;
- difficult monitoring in remote ocean locations;
- scientific gaps regarding cumulative impacts;
- need for real-scale testing.
Moreover, the very collection of nodules continues to face criticism, even when processing is cleaner. Various experts claim that any physical disturbance on the seabed poses a risk to delicate organisms and sediments.
Submarine Mining And Sustainability: A Complex Balance
The global debate revolves around a key question: is it possible to extract mineral resources vital to the energy transition without compromising unique marine ecosystems?
The answer is not yet definitive. However, advances such as this ecological technique indicate that science is seeking intermediate solutions — capable of allowing resource extraction, but with less interference in the natural processes of deep waters.
Furthermore, alignment with clean technologies, such as green hydrogen, reinforces the idea that it is possible to build a more efficient and environmentally responsible sector.
As a result, this innovation can:
- reduce direct environmental impacts;
- drive stricter and more modern regulations;
- attract international investments;
- accelerate the development of sustainable mining.
Future Perspectives And The Importance Of The Topic For The Sector
The discussion on submarine mining and sustainability is expected to intensify in the coming years. After all, the global demand for critical metals is rapidly increasing, while pressure to protect the oceans and reduce carbon emissions is also growing.
The new ecological technique represents a viable, promising, and less aggressive alternative that could directly influence future environmental and energy policies.
Although it still depends on regulatory advances, further studies, and integration with low-carbon energies, it shows that scientific innovation and environmental responsibility can go hand in hand.
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