Displaying items by tag: Cimpor

African cement producers have confirmed their interest in calcined clay over the last month with two new projects. The big one was announced last week when FLSmidth revealed that it had received an order from CBI Ghana. This follows the launch of a Limestone Calcined Clay (LC3) project in Malawi in mid-March 2022 in conjunction with Lafarge Cement Malawi.

FLSmidth says that its order includes the world’s largest gas suspension calciner system and a complete grinding station. The kit will be installed at CBI Ghana’s plant near Accra in the south of the country. The new clay calciner system is expected to substitute 30 - 40% of the clinker in the final product, resulting in a reduction of up to 40% CO₂/t of blended cement compared to Ordinary Portland Cement (OPC). Overall the equipment manufacturers reckon that the grinding plant will reduce its CO₂ emissions by 20% compared to its current output. There has been no indication of how much the order costs but CBI Ghana expects energy and fuel savings, as well as lower overheads from clinker imports.

The public announcement of the Ghana project was also foreshadowed by the visit of Professor Karen Scrivener to the Ghana Standards Authority in February 2022. This was significant because Scrivener is the head of the Laboratory of Construction Materials at the Ecole Polytechnique Fédérale de Lausanne (EPFL) and has been one of the key instigators of the LC3 initiative since the early 2000s. Other calcined clay cements are available such as Futurecem or polysius activated clay (see below) but LC3 is arguably the most famous given its promotion in developing countries.

The Malawi project is at a much earlier stage. The government launched the public private partnership LC3 project in mid-March 2022 in conjunction with Lafarge Cement Malawi and Terrastone, a brick manufacturer. The Ministry of Mining is currently developing a memorandum of understanding with the Gesellschaft für Internationale Zusammenarbeit (GIZ), a Germany-based development agency. India-based Tara Engineering has also been linked to the scheme.

One thing to note about the Malawi project is that it is the first calcined clay project in the cement industry based in East Africa. All the other African ones are based in West Africa. The other two projects in this region are run by Turkey-based Oyak Çimento and its subsidiary Cimpor. The first of these is a 0.3Mt/yr calcined clay and a 2400t/day cement grinding production line that was commissioned in mid-2020. This plant is based at Abidjan in Ivory Coast. The second is a new plant that Germany-based ThyssenKrupp Industrial Solutions is building for Oyak Çimento at Kribi in Cameroon. This unit has a 720t/day calcined clay and a 2400t/day cement production capacity and it will use the supplier’s ‘polysius activated clay’ technology. ThyssenKrupp’s involvement came to light in early 2020 and commissioning was scheduled for late 2021. However, no update on the state of the project has been issued so far in 2022.

As the above examples show, Sub-Saharan Africa has at least one live calcined clay plant, two plants are being built and there’s one more at the development stage. This puts the region neck-and-neck with Europe, which has a similar mixture of current and developing projects. This column has been covering the wider trend of the growing usage of various types of blended cements recently, particularly in Europe and the US, with slag cements, Portland Limestone Cement (PLC) and more. With PLC, for example, note the transition of another two North American cement plants to PLC this week alone. As for calcined clay cement, it is fascinating to see the focus move to a different part of the world. Several commentators have predicted that the future looks set to be dominated by blended cements using whichever supplementary cementitious material (SCM) is most available for each plant. The growth in calcined clay confirms this view.

Global Cement is researching clay calcination use in the cement industry for the next edition of the Global Cement Directory. Email This email address is being protected from spambots. You need JavaScript enabled to view it. with any information on new industrial and research installations.

Portugal: Cimpor is participating in a consortium, led by power company Rega Energy, which plans to invest Euro100m in developing scalable green hydrogen production plant technologies. The consortium will deploy infrastructure for its upcoming Vale Hidrogénio Verde Nazaré (NGHV) green hydrogen plant by 2023, including a dedicated 40MW solar-powered electricity grid. It will commission its first green hydrogen plant by 2026, creating 140 new jobs. The consortium aims subsequently to scale up the plant to a renewable power consumption of 600MW. It hopes that, when fully commissioned, the NGHV plant will be a reference project for green hydrogen production.

Portugal: Cimpor has announced plans for the establishment of 1MW solar power plants at each of its three cement plants in Portugal. The Dinheiro Vivo newspaper has reported that the measure comes under a planned Euro130m investment package in upgrades to its cement operations before 2030. The plans include the expansion of the solar power plants to a total capacity of 10MW by 2025. Additionally, the producer will install two waste heat recovery (WHR) plants with a combined capacity of 8MW at its Alhandra and Souselas cement plants. The company is aiming to reduce its indirect CO₂ emissions by 30%. It also has an alternative fuel (AF) substitution rate target of 70% by 2030 - compared to 3% in 2020, when it used 150,000t of AF.

Cimpor has previously invested a total of Euro7.2m in dedicated sustainability-related measures.

The latest piece of China-based Huaxin Cement’s global ambitions slotted into place this week with the news that it is preparing to buy plants in Zambia and Malawi. Its board of directors has approved plans to spend US$150m towards acquiring a 75% stake in Lafarge Zambia and US$10m on a 100% stake in Lafarge Cement Malawi. The move will gain it two integrated plants with a combined production capacity of 1.5Mt/yr in Zambia, and a 0.25Mt/yr grinding plant in Malawi.

This latest proposed acquisition represents the next step for Huaxin Cement in Africa following its purchase of African Tanzanian Maweni Limestone from ARM Cement in mid-2020. The company has also been busy along the more traditional Belt and Road Initiative land routes in Asia. It started up the kiln at its new 2Mt/yr Jizzakh cement plant in mid-2020. Elsewhere in Central Asia it runs two plants in Tajikistan and one plant in Kyrgyzstan via various indirectly-owned subsidiaries. While in South Asia it runs a plant in Nepal and in South-East Asia it runs one in Cambodia. If the plans in Zambia and Malawi pay off then it will give the Chinese producer a growing presence in East Africa, with plants in three countries.

The China Cement Association ranked Huaxin Cement as the country’s fifth largest clinker producer in 2021 with an integrated capacity base of just under 63Mt/yr. Domestically, the company operates 57 cement plants and most of these are based in the Yangtze River Economic Belt region. In 2020 it reported cement and clinker sales of 76Mt, a small decrease from 2019. Its operating income fell by 6.6% year-on-year to US$4.58bn and profit dropped by 12% to US$1.2bn. This performance was blamed on the emergence of Covid-19 at the start of 2020 and then floods later in the year.

Compared to the other larger Chinese cement producers, Huaxin Cement roughly appears to be holding rank with its overseas expansions. The leaders, CNBM and Anhui Conch, hold subsidiaries with plants in South-East and Central Asia and CNBM’s engineering wing, Sinoma, has a far bigger reach, building plants all over the place. Information has been scarce since mid-2020 on the long heralded 7Mt/yr plant in Tanzania due to be built by Sinoma and local subsidiary Hengya Cement. At that time local residents in Mtimbwani, Mkinga District were reportedly being compensated for their land. Other than this, one of the other big players internationally is Taiwan Cement. In 2018 it invested around US$1.1bn for a 40% stake in Turkey-based Oyak Cement. As well as a presence in Turkey this also gave it a share of plants in Portugal in 2019 when Oyak completed its acquisition of Cimpor.

Elsewhere this week, carrying some of the themes above with expansion in Central Asia, two new integrated cement plant projects were announced in Kyrgyzstan and Turkmenistan respectively. Meanwhile, Italcementi said it will invest Euro5.0m to restart clinker production at its Trentino cement plant in Sarche di Madruzzo, Italy. The unit has been operating as a grinding plant since 2015. This might be viewed as an unexpected decision considering the high local CO2 price but it shows some level of confidence in the local market by Italcementi and its parent company, HeidelbergCement. The next step will be when or if a European producer decides to build a brand new integrated plant in Italy or elsewhere.

Portugal: Denmark-based FLSmidth has won a contract to supply a chlorine bypass system to Cimpor’s Souselas cement plant. The aim is to eliminate chlorine build-up in the plant’s flue gas after the company increases its refuse-derived fuel (RDF) usage rate to 60%. Work is scheduled to begin in mid-2021, and production will stop until its completion and the commissioning of the installation in early 2022. No value for the order has been disclosed.

Cimpor Cement project manager Paulo Evangelista said, “Investing in the chlorine bypass is a key step on our journey towards reducing our environmental footprint. On top of the obvious incentives to increase our fuel substitution, like lower CO₂ emissions and financial savings, we are experiencing better waste handling infrastructure in the local area. All this has made it an easy choice to make. FLSmidth knows our Souselas site and has been key in delivering a solution that will enable this next phase on our sustainability journey.”

Australia: Calix has reported the completion of a pre-front-end engineering and design (FEED) study of its Leilac-2 carbon capture and storage (CCS) study. Germany-based HeidelbergCement, Mexico-based Cemex and Portugal-based Cimpor assessed the study. The milestone clears the technology for industrial scale implementation at HeidelbergCement’s Hannover integrated cement plant in Germany. The installation aims to capture 100,000t/yr of CO₂ at an installation cost of Euro23m (+/-30%). The final investment decision will follow after the completion of FEED in early 2022.

Portugal: Cimpor has won a contract to supply cement for a new 80km railway line linking Elvas to Évora. It expects to delivery up to 0.14Mt of cement for the project, according to the Dinheiro Vivo newspaper. Cement will be supplied from its Alhandra integrated plant and ready-mixed concrete from other sites. The project is expected to be completed in early 2023.

Cement and concrete products with sustainability credentials have increased in recent years as societies start to demand decarbonisation. In spite of the recent drop in the European Union (EU) Emissions Trading Scheme (ETS) price, there has been a trend in recent years in the construction industry towards offerings with better environmental credentials. Indeed, this week’s position paper from Cembureau on a carbon border mechanism concerns directly the growth of these kinds of products within Europe. Typically, the higher profile projects have been slag cement or concrete implementations such as Hanson’s use of its Regen cement substitute in a London sewer project or David Ball Group’s Cemfree concrete in a road project also in the UK. In this short review we’ll take a selective look at a few of the so-called low carbon cement and concrete products currently available.

Table 1: Some examples of methods to reduce embodied CO₂ in cement and concrete. Note - the product examples are selective. In some cases many other products are available.

Looking at cement first, the easiest way for many producers to bring a lower carbon product to market has been to promote cements made using secondary cementitious materials (SCM) such as granulated blast furnace slag or fly ash. These types of cements have a long history, typically in specialist applications and/or in relation to ease of supply. For example, cement producers in eastern India often manufacture slag cements owing to the number of local steel plants. However, cement producers have more recently started to publicise their environmental credentials as they reduce the clinker factor of the final product. Alongside this though, in Europe especially, a number of so-called low carbon cement producers have appeared on the scene such as EcoCem and Hoffman Green Technologies. These newer producers tend to offer SCM cement products or other low carbon ones built around a grinding model. It is likely that their businesses have benefitted from tightening EU environmental legislation. How far cement producers can pivot to SCM cement products is contentious given that slag and fly ash are finite byproducts of other industries that are also under pressure to decarbonise. Although it should be noted that other SCMs such as pozzolans exist.

As will be seen below a few of the methods to reduce embodied CO₂ in cement and concrete can be used in both materials. SCMs are no exception and hold a long history in concrete usage. As mentioned above David Ball Group sells Cemfree a concrete product that contains no cement. Harsco Environmental, a minerals management company, invested US$3m into Carbicrete, a technology start-up working on a cement-free concrete, in late 2019.

Limestone calcined clay cements are the next set of products that are starting to make an appearance through the work of the Swiss-government backed LC3 project, more commercial offerings like FutureCem from Cementir and H-EVA from Hoffman Green Technologies and today’s announcement about ThyssenKrupp’s plans to fit the Kribi cement plant in Cameroon with its Polysius activated clay system. They too, like SCM cements, reduce the clinker factor of the cement. The downside is that, as in the name, the clay element needs to be calcined requiring capital investment, although LC3 make a strong case in their literature about how fast these costs can be recouped in a variety of scenarios.

Calcium silicate cements offer reduced process emissions by decreasing the lime content of the clinker lowering the amount of CO₂ released and bringing down the temperature required in the kiln to make the clinker. Solidia offers its calcium silicate cement as part of a two-part system with a CO₂ cured concrete. In the US LafargeHolcim used Solidia’s product in a commercial project in mid-2019 at a New Jersey paver and block plant. Solidia’s second core technology is using CO₂ to cure concrete and reducing water usage. They are not alone here as Canada’s CarbonCure Technologies uses CO₂ in a similar way with their technology. In their case they focus more on CO₂ mineralisation. In Germany, Schwenk Zement backed the Celitement project, which developed a hydraulic calcium hydro silicate based product that does not use CO₂ curing. Celitement has since become part of Schwenk Zement.

Solidia isn’t the only company looking at two complementary technologies along the cement-concrete production chain. A number of companies are looking at recycling concrete and demolition waste. Generally this splits into coarse waste that is used as an aggregate substitute in concrete and fine waste that is used to make cement. LafargeHolcim has Evopact for the coarse waste and Susteno for the fine. HeidelbergCement has EcoCrete for the coarse and is researching the use of fines. Closing the loop for heavy building material producers definitely seems like the way to go at the moment and this view is reinforced by the involvement of the two largest multinational producers.

Of the rest of the other low carbon cement methods detailed in table 1 these cover other non-Ordinary Portland Cement (OPC) such as geopolymer and calcium sulphoaluminate cements. The former are a type of alkali activated binder and generally lack common standards. The latter are similar to slag cements in that they are established specialist products with lower CO₂ emissions than OPC.

With concrete when trying to make a low carbon product the first choice is whether to choose a low-carbon cement as the binder or even not to use cement at all in the case of Regen or Cemfree. From here the next step is to simply use less cement in a concrete mixture. There are a number of ways to do this from optimising aggregate gradation, following performance specifications more closely, using strength tests like maturity methods and generally adhering to quality control protocols better to deliver more consistency. Read the Mineral Production Association (MPA) publication Specifying Sustainable Concrete for more detail on this. Using concrete admixtures can also help make concrete more sustainable by improving quality and performance at construction sites through the use of plasticisers and accelerators, by decreasing embodied carbon through the use of water reducers and by improving the whole life performance of concretes. The use of locally-sourced aggregates is also worth noting here since it can reduce associated transport CO₂ emissions.

More novel methods of reducing embodied CO₂ emissions in concrete include the use of geopolymer concrete in the case of Zeobond Group’s E-Crete or adding graphene as Concrene does. Like geopolymer cements, geopolymer concretes are relatively new and lack common standards. Products like Concrene, meanwhile, remain currently at the startup level. Finally, if all else fails, offsetting the CO₂ released by a cement or concrete product is always an option. This is what Cemex has done with its Vertua Ultra Zero product. The first 70% reduction in embodied CO₂ is gained through the use of geopolymer cement. Then the remaining 30% reduction is achieved through a carbon offsetting scheme via a carbon neutral certification verified by the Carbon Trust.

As can be seen, a variety of methods exist for cement and concrete producers to reduce the embodied CO₂ of their products and call them ‘low-carbon.’ For the moment most remain in the ‘novelty section’ but as legislators promote and specifiers look for sustainable construction they continue to become more mainstream. What has been interesting to note from this short study is that some companies are looking at multiple solutions along the production and supply chain whilst others are concentrating on single ones. The companies looking at multiple methods range from the biggest building material producers like LafargeHolcim and HeidelbergCement to smaller newer ones like Solidia and Hoffman Green Technologies. Also of note is that many of these products have existed already in various forms for a long time like SCM cements and concretes or the many ways concretes can be made more sustainable through much simpler ways such as changing aggregate sourcing or working more efficiently. In many cases once markets receive sufficient stimulus it seems likely that low carbon cement and concrete products will proliferate.

Global Cement is researching a market report on low carbon cement and concrete. If readers have any comments to make please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.

Cameroon: Germany-based Thyssenkrupp Industrial Solutions has won an engineering, procurement, construction and commissioning (EPCC) contract with Netherlands-based Cimpor Global Holdings for the installation of a clay calcination plant at its new integrated Kribi cement plant in the Port of Kribi in South Cameroon. The system calcines clay at just 800°C, which can then replace clinker at a ratio of one to two, lowering the finished cement’s clinker factor by up to 33%.

ThyssenKrupp says that use of the system, the first of its kind in Cameroon and second at a Cimpor Global Holdings cement plant, will help cut CO₂ emissions by 120,000t/yr, corresponding to a reduction of 40%.

Cape Verde: Turkey’s OYAK is planning to invest in pozzolan extraction following a meeting between OYAK's Cement Concrete Paper Group chairman Suat Çalbiyik and prime minister Ulisses Correia e Silva. Mining activity has remained muted since Cabocem, an Italian company, closed in 2013, according to Sapo. OYAK has operations in the country via Portugal’s Cimpor, which it acquired in 2019.