A new report by Australian government’s scientific agency CSIRO offers a roadmap for how carbon capture, utilisation and storage (CCUS) that could help cement and lime industries reach net zero by 2050
It’s tough for the cement and lime business to make its important products without generating high emissions. So, the industry is investing in research and innovative pathways to reduce its hard-to-abate emissions.
That’s the opening of a new report by CSIRO (Commonwealth Scientific and Industrial Research Organisation) which says: “To help, we’ve brought our expertise to a new roadmap.”
It sets out the opportunities and challenges for carbon capture, utilisation and storage (CCUS) technologies to reduce the industry’s emissions in Australia. It also determined that there is no one-size-fits-all solution.
The Heavy Industry Low Carbon Transition Co-operative Research Centre commissioned the Roadmap for Carbon Capture, Utilisation and Storage for Production of Low Emission Cement and Lime in Australia. CSIRO worked with Adbri, The University of Adelaide, Calix, UNO Technology, and the Cement Industry Federation (CIF) to develop the roadmap.
The report by CSIRO concluded there are two main takeaways: “The first is CCUS requires deep collaboration – both nationally and internationally – between industry and researchers.
“The second is that the best way for companies to learn is by doing. That doesn’t mean you have to spend millions of dollars on something right away that may not work. You can take a low-risk approach, like a feasibility or pilot plant study.
“Ultimately, CCUS is going to be the most important method for reducing emissions in the sector. So, it’s time to start getting ready for the future.”
Margie Thomson, CEO of the Cement Industry Federation (CIF), recognised the roadmap’s findings and contribution to the sector.
“The roadmap is a welcomed addition to the Australian cement industry’s ongoing efforts to lower emissions and reach net zero by 2050,” she said.
Dr Hai Yu is a Principal Research Scientist at CSIRO and the roadmap co-author, said: “HILT CRC has been focusing on how hard-to-abate industries like cement, lime, alumina, iron and steel can reach net zero emissions by 2050. This work requires deep collaboration between industry, universities and research organisations like CSIRO.
“CCUS is going to be absolutely critical in the cement and lime industries. Our aim with this roadmap is to move the research forward and help industry stakeholders find the best technology options for them,” he said.
Cement is a binder material used in concrete, mortar and other construction materials. Its key ingredient is clinker. Clinker is made under high temperatures from raw materials like limestone and clay.
When cement is mixed with water, sand and aggregates, it turns into concrete. Concrete is the most common construction material in the world and globally, people use 30 billion tonnes of concrete each year.
Lime is made by heating limestone. This important chemical is used in metallurgy, industrial applications and construction. In 2021, the estimated total global production of lime was 430 million metric tons.
The cement and lime industries are vital. In Australia, it takes about 14 tonnes of cement to build a typical family home. Also, a kilometre of freeway contains as much as 2,500 tonnes of cement. However, the industry is one of the hardest to decarbonise.
“Most emissions are not from energy use, but from carbon dioxide (CO2) that is released when heating limestone to form calcium oxide. This means they are from the process itself rather than from heat energy or electricity generation,” Hai said.
“When you talk about a coal-fired power station, for example, we know burning coal produces CO2 but there are alternatives. We can use solar or wind to generate renewable electricity without creating those emissions.
“When it comes to producing cement, there is not a large-scale alternative. We can’t produce it without creating CO2. That’s why carbon capture and storage is necessary and important for reducing these ‘process’ emissions.”
In 2021, world-wide emissions from making cement produced about 2.9 billion tonnes (2.6 billion metric tonnes) of CO2. For perspective, if the cement industry was a country, it would be the fourth largest national emitter in the world, behind China, the US and India.
CSIRO engaged with industry to identify Australian cement and lime plants that can adopt CCUS technologies. This included a review of potential sequestration and use sites as well as transport infrastructure requirements.
CSIRO also assessed priority options and identified which ones needed further research.
The CCUS technologies it selected for further analysis were:
- Capture technologies. This includes post-combustion capture based on liquid absorbents, calcium looping and cryogenic processes as well as Calix’s LEILAC for retrofit applications
- CO2 conversion to fuels, chemicals and carbonates
- CO2 transport by pipeline and shipping for geological storage.
