Displaying items by tag: Limestone

Cementir Group launched two of its lower carbon cement products in the Middle East and Africa markets this week. We’ll take a look at this in more detail and cover other recent products news from cement producers.

Egypt-based Sinai White Cement will manufacture the products under Cementir’s D-Carb umbrella. One will be a Limestone Portland cement, to the CEM II/A-LL 52.5N specification EN197-1, with around a 10% clinker reduction. The other will be CEM II/B-LL 42.5N with around a 20% clinker reduction. Both of these reductions are in comparison to Aalborg White CEM I 52.5R. D-Carb is the name of Cementir’s product range for white low-carbon cements. It was launched in European markets in 2024, with II/ALL 52.5R cement, and then expanded to Asia Pacific regions, including Australia, in early 2025. Cementir says that its customers can switch to D-Carb from CEM I as it “integrates well with their production processes without requiring major formulation changes.”

In late October 2025 Dyckerhoff revealed that it was the first cement manufacturer in Germany to receive general building authority approval (abZ) for the use of CEM VI (SLL) cement in accordance with DIN EN 197-5. The German Institute for Building Technology (DIBt) granted approval for Dyckerhoff’s Lengerich cement plant. CEM VI is a newer type of composite cement similar to CEM II but with a lower clinker content. The SLL type that Dyckerhoff wants to make has a clinker content of 35 – 49 %, granulated blast furnace slag of 31 – 59% and limestone of 6 – 20%. The company says that this cement can be used in more than 60% of all concrete types produced in ready-mixed concrete plants. Its composition is also useful for low-carbon concretes when no fillers, such as fly ash, are available. Dyckerhoff added that the low hydration heat of the cement has a particularly positive effect in massive cast components.

Earlier in October 2025 Rohrdorfer held an inauguration ceremony for a new pilot unit for calcined (they say tempered) clays at its Rohrdorf cement plant. The pilot project started in July 2025 and has been processing up to 50t/day of raw clay. When Rohrdorfer launched the project in early 2024 it said that it was going to use waste heat from the main production line and was also considering the use of hydrogen to provide the remaining amount of heat required. Waste gases produced during calcination were also going to be fed back into the existing waste gas cleaning system of the clinker production line after leaving the pilot plant to further reduce emissions. Rohrdorfer said that its approach was going to be the first time waste heat recovery was going to be used in conjunction with calcining clay.

Meanwhile, in West Africa, Dangote Cement inaugurated its new 3Mt/yr cement plant near Abidjan in the Ivory Coast in mid-October 2024. Around the same time the company launched various products in the country, including its CEM I and CEM II brands 32.5R, 3X42.5N, 3X42.5R and 52.5N. This is a more traditional range of cement products compared to the ones above but note the highlighting of strength. This has been a key selling point for products in this part of the world previously, hence its focus. CEM II is a blended cement that uses lower levels of clinker. One clinker substitute in CEM II products is calcined clay. Gebr. Pfeiffer, for example, said in August 2025 that it was to supply a vertical roller mill to Ciments de Côte d'Ivoire (CIMCI) for clay grinding at its cement plant. There are also a number of other calcined clay projects in the Ivory Coast and other countries in West Africa. Further afield, JK Cement in India also started to market its LC3 clay calcined cement product line in October 2025.

Finally, US-based Amrize launched its ‘Made in America’ label for its cement range this week, “offering builders the guarantee of American manufacturing and quality, supporting American jobs and local communities.” Readers may recall that Amrize was recently owned by Switzerland-based Holcim. However, the company is currently keen to point out that its cement products are “made in the US from its raw materials and processing to manufacturing, meeting rigorous US performance standards.” Amrize does sell blended cements including FortiCem Portland-Pozzolan Blended Cement, ECOPlanet Cements and OneCem Portland Limestone Cement.

Most of the news stories highlighted above demonstrate a trend for blended cements with lower clinker factors. There’s no real change here. This has been happening for a long time and it is being driven by both profit and sustainability motives, although the current bunch of stories may also be turning up to coincide with the COP30 conference in Brazil. Note the inclusion of places outside of Europe and the drive for new blends. Another factor to consider here is protectionism in certain markets, as Amrize’s marketing drive suggests. New blends will also require new certifications, standards and approvals as is the case with Dyckerhoff’s work on CEM VI (SLL). The next trend to watch for will be the market reaction to carbon captured cements, such as Heidelberg Materials’ evoZero product. Will end users pay a premium for zero-carbon cements?

Germany: AUMUND Fördertechnik has launched its electrified Linear Calcination Conveyor (eLCC), which enables efficient clay calcination for limestone calcined clay cement (LC3).

LC3, composed of roughly 50% clinker, 30% calcined clay, 15% limestone and 5% gypsum, can reduce CO₂ emissions by up to 40% compared to ordinary Portland cement, according to the company. The technology enhances pozzolanic reactions between limestone and calcined clay, which provides additional alumina to form carboaluminate phases, improving strength and durability while lowering clinker use. Developed in collaboration with Holcim over four years, the eLCC was tested successfully at AUMUND’s pilot demonstration unit in Rheinberg, confirming its potential to support low-carbon cement production at industrial scale.

Rwanda: Cement producer Cimerwa will invest about US$190m in a new clinker plant, aiming to reduce its dependence on imports and save an estimated US$2.88bn in foreign exchange over the next 25 years. CEO Mangesh Kumar Verma said the plant, which will be built in Musanze, is expected to begin operations within two years with a capacity of 0.72Mt/yr of clinker. The plant will meet the company’s local demand of 0.54Mt/yr, with the surplus exported. Verma said that if limestone reserves prove larger than expected, there is provision to add another line. The investment follows rising costs from importing clinker, which currently amount to around 0.36Mt/yr at a cost of US$3.7m–4.0m. Verma added that clinker makes up about 70% of cement production costs, rising to 95% when imported.

Cimerwa’s unaudited financial results for the nine months ending 30 June 2025 showed that revenues were up by 50% year-on-year to US$75m, driven largely by its July 2024 acquisition of Prime Cement. However, profit before tax dropped by 23% to US$7.7m, reportedly due to input cost increases and continued depreciation of the Rwandan Franc. The company said that the Musanze clinker plant will stabilise production costs and position Rwanda as a net exporter, supporting large-scale infrastructure projects such as the New International Airport in Bugesera.

India: JK Cement has commenced construction of a US$340m greenfield cement plant in Jaisalmer, Rajasthan. The new facility, spread across 212 hectares, is scheduled for completion by early 2027. The plant will reportedly ensure long-term raw material security through access to local limestone reserves, while also being close to high-demand markets in Rajasthan, Gujarat and Haryana.

India: Star Cement subsidiary Star Cement North East has been named preferred bidder for the Parewar (SN-IV) limestone block in Jaisalmer, Rajasthan. The 960-hectare block holds an estimated 271Mt of limestone. The company said the mining lease will strengthen its long-term raw material security once clearances and agreements are completed.

Star Cement operates 7.7Mt/yr of cement grinding capacity and 6.1Mt/yr of clinker capacity.

Ecocem announced this week that it has achieved certification in the US for its ACT low-carbon cement technology. This follows CRH’s agreement to buy US-based Eco Material Technologies, a supplier of supplementary cementitious materials (SCM), which was revealed in late July 2025. These moves and others mark a flurry of activity by various companies in the US SCM sector in recent months.

Donal O’Riain, the founder and managing director of Ireland-based Ecocem, underlined the importance of certification in North America when he said that “The US is one of the largest cement markets in the world, and this certification will support integration into existing supply chains and offers a pathway for the sector to rapidly decarbonise.” The country imported just under a fifth, 19Mt, of its Portland and blended cement in 2024 according to the United States Geological Survey (USGS).

Ecocem started out as a manufacturer of cements made using ground granulated blast furnace slag (GGBS), a SCM, in the early 2000s. Its ACT technology was formally announced in 2022. It is described as a process that can make cements using “available fillers like limestone and local SCMs.” It is currently scheduled for a commercial launch in 2026, starting in France. In the US it is planning to build a terminal and mill at the Port of Los Angeles in California. This follows a previous attempt to build a slag grinding plant, also in California, in the 2010s.

CRH, another cement company with strong links to Ireland incidentally, said on 29 July 2025 that it had agreed to acquire Eco Material for US$2.1bn. The latter operates a network of fly ash, pozzolan, synthetic gypsum and green cement operations. It partners with electricity generators to process about 7Mt/yr of fly ash and 3Mt/yr of synthetic gypsum and other materials. As CRH’s CEO Jim Mintern put it, “this transaction secures the long-term supply of critical materials for future growth and puts CRH at the forefront of the transition to next generation cement and concrete.” The deal is expected to close by the end of 2025. In separate comments to analysts Mintern added that he expects the market for SCMs to double in the US by 2050.

Other players have also been busy in recent months. Amrize, for example, noted in its financial results for the second quarter of 2025 that it had broken ground on a new fly ash beneficiation facility in Virginia in the reporting period. Last week, Graymont and Fortera signed an agreement to produce Fortera’s ReAct low-carbon cement product by using Graymont’s existing lime production operations. Fortera runs a plant in Redding, California that takes captured CO₂ from the adjacent CalPortland cement plant and uses it to manufacture its own proprietary SCM. Back in April 2025 Buzzi Unicem said that it had partnered with Queens Carbon to produce a novel cement and SCM. The start-up was intending to build a 2000t/yr demonstration plant at Buzzi Unicem’s cement plant in Stockertown, Pennsylvania.

The backdrop to all of this attention on SCMs in the US are the cost of cement and sustainability. Using more SCMs reduces clinker usage in cement and it can reduce the cost. At the same time reducing the amount of clinker used decreases the amount of CO₂ emissions. So, for example, Ecocem says that its ACT technology can reduce CO₂ emissions by up to 70% compared to conventional cement.

A report by Mckinsey on SCMs in the autumn of 2024 reckoned that growth in the cement market in North America was expected to be ‘robust’ in the next 15 years to 2050. However, the sector faces material, particularly clinker, and labour shortages. Enter SCMs! It went on to assert that much of the available stocks of GGBS and fly ash in the country are effectively used. Yet, traditional industrial SCMs such as GGBS, fly ash and limestone are anticipated to be available for longer than in Europe as industries such as steel manufacture and electricity generation will take longer to decarbonise. Hence companies such as Ecocem are preparing to import them, ones like CRH are cornering existing stocks and others such as Fortera and Queens Carbon are working on creating their own ‘virgin’ sources. At the same time the American Cement Association has been promoting the use of Portland Limestone Cement in the country.

All this helps to explain the interest in SCMs in the US right now. It’s a busy moment.

Chile: cbb (formerly Cementos Bío Bío), has announced a binding agreement to sell all of its shares to Belgium-based producer Carmeuse, which will launch a tender offer for 100% of the shares of the company ‘no later than 13 August 2025’, according to Noticias Financieras. Shareholders representing 64.57% of the shares signed the Agreement to Tender, obliging them to transfer their holdings to Carmeuse subsidiary Carmel Holdings. The offer will value the company at US$505m, equivalent to US$1.91/share.

Carmeuse specialises in lime and limestone derivatives and operates 90 production sites worldwide. The acquisition aligns with its interest in cbb’s lime production through subsidiary Bío Bío Cales, which operates plants in Antofagasta and Copiapó.

The announcement of the sale comes after a race for control of the company at the end of 2024. In December 2024, Peru-based Yura acquired 0.81% of shares through a public offer, increasing its stake to 20.75%. Mississippi Lime Company also submitted a non-binding offer for the company for US$1.89/share in May 2024, but later withdrew.

Kenya: Ndovu Cement, owned by Karsan Ramji & Sons, will build a 600t/day greenfield clinker plant and a limestone quarry in Mukawa, Kajiado County, according to regulatory filings. The project has already secured approval from the National Environment Management Authority. The company said the limestone quarry will ensure a reliable supply of 900t/day of limestone.

The facility is expected to reduce reliance on imports following a 17.5% levy on clinker imports introduced in July 2023, according to the Business Daily Africa newspaper. The measure was aimed at boosting local production and creating jobs, but has since led to a drop in cement consumption due to price increases and a fall in imports. Kenya-based cement producers had reportedly opposed an attempt to increase import duty on clinker, instead requesting a grace period of four years, until 2026, to allow them to build their own clinker production facilities.

Karsan began as a quarry operator in Kitengela, Kilifi and Nakuru, before beginning cement production in 2015 and launching Ndovu Cement in June 2015.

UK/Norway: UK-based marine carbon capture firm Seabound has launched an onboard carbon capture project in partnership with Hartmann Group, InterMaritime Group and Heidelberg Materials Northern Europe. The solution equips the UBC Cork, a 5700 gross tonne cement carrier, with Seabound’s calcium looping carbon capture system. This system captures up to 95% of CO₂ and 98% of sulphur emissions from the ship’s exhaust using calcium hydroxide to absorb the CO₂ and convert it into limestone that is stored onboard until returning to port. The captured carbon will be offloaded at the Port of Brevik for use at Heidelberg Materials’ Brevik cement plant, host of the first industrial-scale carbon capture facility in the cement sector.

The project is co-funded by the Eurostars partnership on Innovative SMEs, part of Horizon Europe through the Cyprus Research and Innovation Foundation. This funding supports collaborative research and development projects in a range of industries, including maritime transport.

CEO of Seabound Alisha Fredriksson said “We’re proud to partner with industry leaders like Heidelberg Materials and Hartmann to deliver scalable carbon capture solutions. We’re especially excited to be advancing this work in Brevik, a strategic location that’s rapidly establishing itself as a global hub for CCS with Heidelberg’s world-first facility and the Northern Lights pick up point. Together, we’re demonstrating how onboard carbon capture can accelerate emissions reductions in carbon-intensive sectors.”

Lars Erik Marcussen, Logistics project manager at Heidelberg Materials Northern Europe, said “Shipping cement is emissions-intensive, and Seabound’s system gives us a clear path to reduce those Scope 3 emissions while enhancing our circular use of captured CO₂. This project also brings us one step closer to decarbonising the logistics/transport part of our operations.”

Pakistan: The Supreme Court has granted a two-week stay to cement producers, suspending a recent ruling that required higher royalty payments on limestone. Earlier, the Lahore High Court had ordered producers to pay royalties based on 6% of the ex-factory price of cement or clinker. Producers argue that the levy is ‘disproportionate’ and intend to contest the case fully in the next hearing.