The steel sector faces one of the most difficult decarbonisation challenges in the global economy.
Steel is essential to modern infrastructure, housing, energy systems, transport and manufacturing. It is also deeply embedded in a production system that has traditionally depended on coal, coke and high-temperature blast furnaces.
There is no single route to low-carbon steel.
Electric arc furnaces using scrap, direct reduced iron, hydrogen, renewable electricity, material efficiency and circularity will all have roles to play. But many existing steel plants will continue to operate for years, especially in regions where blast furnaces remain central to industrial capacity.
That is why a new carbon-capture trial at Shougang Group’s Jingtang steelmaking operation in China deserves attention.
Rio Tinto and Shougang have commissioned an industrial-scale facility designed to capture carbon dioxide from blast-furnace gas. According to Rio Tinto, the facility can process up to 3,000 cubic metres of blast-furnace gas per hour and capture up to 10,000 tonnes of CO₂ annually. It has been integrated into the ironmaking production system and will operate over the long term for research and trial purposes.
The project is not a declaration that carbon capture has solved steel’s emissions problem.
It is a more useful signal: industrial decarbonisation requires practical evidence about which solutions work in real operating conditions, at real facilities, with real energy systems and commercial constraints.
Why blast-furnace capture matters
Blast furnaces produce iron by reducing iron ore with carbon-rich materials, primarily coke. The process generates blast-furnace gas, which contains carbon dioxide alongside carbon monoxide, nitrogen and other components.
Capturing CO₂ from this gas can be technically challenging. The gas stream has to be separated, treated and processed without undermining the reliability of the steel plant itself.
A trial integrated into an operating ironmaking system is therefore more significant than a laboratory demonstration.
It can test questions that matter for deployment:
How reliably does the capture system operate alongside production?
How much energy does it require?
How does it affect production efficiency?
What capture rate can be sustained?
What maintenance and operating challenges emerge?
Can waste heat from the site reduce energy costs?
What happens to the captured CO₂ next?
The final question is critical.
Capturing CO₂ is not the same as permanently reducing atmospheric emissions.
Capture is the start, not the end
Carbon capture has three linked stages:
Capture the carbon dioxide from an industrial source or directly from air
Transport the CO₂ by pipeline, ship, rail or other infrastructure
Store or use it in a way that delivers a credible climate outcome
A project’s climate value depends on the whole chain.
If captured CO₂ is permanently stored in a suitable geological formation, with monitoring and long-term stewardship, the emissions reduction can be durable.
If it is used in a product or process and later released, the climate value may be shorter-lived. That does not necessarily make utilisation inappropriate, but the accounting must be clear.
The Rio Tinto–Shougang partnership is also exploring whether captured carbon could be converted into synthetic gas and recycled into steelmaking, potentially reducing the need for fresh carbon inputs. That is an interesting circular-industrial possibility, but it should be evaluated separately from permanent storage.
The distinction matters for companies making low-carbon steel claims.
A project may reduce emissions intensity, support process innovation or displace fossil inputs. But it should not automatically be described as a permanent carbon removal unless the CO₂ is stored durably and the accounting supports that conclusion.
Industrial CCS needs a system, not just equipment
For carbon capture to scale in heavy industry, equipment at the stack or furnace is not enough.
A functioning system needs:
Affordable low-carbon energy for capture operations
CO₂ compression and conditioning
Transport infrastructure
Licensed geological storage
Long-term monitoring
Clear liability arrangements
Permitting and community engagement
Investment models that work over decades
Reliable measurement, reporting and verification
This is why CCS is increasingly becoming an infrastructure question.
The ability to capture CO₂ at an industrial site can be valuable, but its ultimate usefulness depends on whether a credible transport-and-storage pathway exists.
Europe’s emerging CCS clusters illustrate this system logic, with shared transport and offshore storage intended to serve multiple industrial emitters. Similar models may be needed elsewhere, adapted to local geology, regulation and industrial geography.
The challenge is especially acute in regions where heavy industry is concentrated but storage infrastructure is limited.
The role of carbon markets and standards
The carbon market is also beginning to engage more directly with carbon capture and storage.
On 28 September, Verra announced that its carbon capture and storage methodology, VM0049, and accompanying modules had received approval from the Integrity Council for the Voluntary Carbon Market as meeting the Core Carbon Principles. The methodology establishes procedures for quantifying emission reductions and removals from projects that capture CO₂ and store it permanently.
This is a significant development, but it should not be misunderstood.
Methodology approval is not a blanket endorsement of every CCS project. It is a framework that sets out how eligible projects should quantify outcomes.
Project-level integrity still depends on details such as:
The source of captured CO₂
The energy used by the capture process
Whether capture reduces or extends fossil-fuel dependence
Transport emissions
Storage permanence
Monitoring and verification
Additionality
The quality of legal and financial arrangements for long-term stewardship
A methodology can make evaluation more consistent. It cannot eliminate the need for careful due diligence.
Low-carbon steel will use several routes
The urgency to cut steel emissions should not lead to an oversimplified technology debate.
Different regions have different starting points:
Some have plentiful renewable electricity and scrap
Some have iron-ore resources suited to direct reduction
Some have emerging hydrogen production
Some have existing blast-furnace fleets with long asset lives
Some have access to suitable CO₂ storage
Some do not
A credible transition therefore needs a portfolio of solutions.
For new capacity, it may be possible to prioritise electrified processes, recycled material, direct reduced iron and cleaner energy sources.
For existing blast furnaces, operational efficiency, material circularity, lower-carbon fuels, process redesign and carbon capture may all play roles in reducing emissions while longer-term infrastructure develops.
The key is to judge each pathway against full lifecycle outcomes rather than its headline label.
The questions customers should ask
Companies purchasing steel, iron ore or industrial materials increasingly need better visibility into the emissions associated with their supply chains.
When a producer announces a carbon-capture project, customers and investors should ask:
What share of total site emissions can the project address?
What is the capture rate under normal operating conditions?
What additional energy does the process require?
What is the source of that energy?
Where will the CO₂ go?
Will it be permanently stored, used temporarily or recycled into the process?
How will emissions reductions be verified?
Can the model scale commercially?
How does it compare with alternatives such as scrap-based production, electrification or direct reduction?
These questions are not intended to dismiss early trials.
They are the questions that convert a promising trial into a credible transition pathway.
Demonstration matters
The Shougang trial is important because decarbonising heavy industry will not happen through abstract commitments alone.
It requires operational learning.
It requires equipment to run in difficult environments. It requires engineering teams to solve reliability problems. It requires better data about energy use, capture performance, costs and lifecycle impacts. And it requires industrial companies to make choices about where to focus investment.
A 10,000-tonne annual capture capacity is small compared with the scale of global steel emissions. But trial facilities are not valuable only for the tonnes they capture today.
Their value lies in the evidence they generate for decisions at much larger scale.
The most useful way to view carbon capture in steel is neither as a silver bullet nor as a distraction.
It is one tool in a wider industrial transformation—and its real climate value will depend on what happens after the CO₂ is captured.