Displaying items by tag: clay calcination plant

Brazil: thyssenkrupp Polysius has secured a front-end engineering design contract from Circlua for the construction of the world’s largest activated clay plant, with a capacity of 0.96Mt/yr (3000t/day). The plant will be largely powered by renewable electricity, and will be located in Pará, utilising clay sourced from the Carajás iron ore complex. The clay contains up to 80% kaolinite content, and will be upcycled as supplementary cementitious material.

thyssenkrupp Polysius CEO Christian Myland said “We are honoured to partner on this landmark project. Leveraging high-quality local clay and our advanced activated clay technology, this plant will set a new benchmark for carbon-conscious cement production.”

China: CBMI Construction has officially launched a flash calcination clay project in Tangshan, Hebei province. Karen Scrivener, head of the Laboratory of Construction Materials at the School of Engineering at the Ecole polytechnique fédérale de Lausanne (EPFL), attended the event. Scrivener is a prominent researcher and advocate for LC3 (limestone calcined clay cement).

CBMI’s other clay projects around the world as a contractor include the SPL Calcined Clay Project in France, the CIZ Calcined Clay Project (rotary calciner) in the Czech Republic, the Guayaquil Calcined Clay Project in Ecuador and the Ivory Coast Calcined Clay Project (flash calciner).

Germany: Aumund and Holcim have demonstrated an electric linear calcination conveyor (eLCC) at Aumund’s headquarters in Rheinberg, Germany. Initial tests of the eLCC have reportedly demonstrated efficient thermal activation of clay through a combination of radiant heat and material circulation. In 2020, Aumund Fördertechnik teamed up with Holcim for a project focused on the electrical calcination of clay using an Aumund pan conveyor.

The company stated that the eLCC system is fully enclosed and insulated, minimising energy requirements and heat loss, with its compact design allowing for expansion of production capacities. It can operate with electrical heating elements powered by 100% renewable energy sources like wind or solar. The first industrial plant utilising this technology will be constructed in 2025.

Burkina Faso: AVIC International Beijing, in collaboration with Humboldt Wedag GmbH (KHD), has won an engineering, procurement and construction (EPC) contract from Ciments de l'Afrique (CIMAF) to build a 900t/day clay calcination plant. This plant aims to integrate with CIMAF's existing clinker grinding line to produce calcined clay cement, potentially reducing CO₂ emissions by up to 30%, according to the company. KHD will be responsible for designing and equipping the plant with clay calcination technology, while AVIC, as the EPC contractor and KHD's parent company, manages the overall project execution.

KHD's system features a two-stage preheater and flash calciner with a pre-combustor, offering adaptability for the future installation of KHD’s Pyrorotor technology to maximise secondary fuel usage. The technology also includes a colour stabilisation process to maintain consistent supply of grey or black calcined clay. The project is scheduled for completion by mid-2026.

CIMAF Group Vice-President, Malik Sefrioui, said "This project is a major piece of our group decarbonisation roadmap, fully financed by IFC under a green loan form. Two other similar projects are being studied and will be launched very soon. The choice of AVIC/KHD is based on their long track record in cement pyro-processing projects. We are sure that this inaugural partnership will deliver significant added value for both parties."

Germany: France-based Fives has won a contract to build a 50t/day clay calcination unit at Rohrdorfer’s Rohrdorf cement plant in Bavaria. The unit will integrate into the plant’s clinker line in order to allow it to test the production of limestone calcined clay cement with up to 40% reduced CO₂ emissions. Fives’ clay calcination unit uses a flash calcination process, based on a three-stage preheater, flash calciner and decolourisation system.

Rohrdorfer’s Net Zero Emissions Labs team is responsible for the project to decarbonise the Rohrdorf cement plant by 2038. Its managing director Helmut Leibinger said “After a detailed technical review, we decided that the flash calciner with an integrated clay calcination unit from Fives FCB was the best solution in terms of reliability, efficiency and colour control. We are confident that the unit will be essential in moving forward on our pathway to net zero.”

France: NeoCem plans to build a €50m clay calcination plant at Saint-Maximin, Picardy. The company recently raised €23m in investments in its Series A funding round. The Le Journal des Enterprises newspaper has reported that the Saint-Maximin plant will enter operation in 2025, and will subsequently grow to 200,000t/yr in capacity. NeoCem aims to employ 100 people by 2030.

Head of industrial deployment Guillaume Luu said “To be used in concrete, limestone must be heated for several hours at 1400°C. Our clay-based binder generates CO₂ emissions of 120kg/t, compared to almost 1000kg/t of limestone binder, and our technology can transform all types of clays available. The idea is not to open new quarries, but to give a second life to materials already on the surface." He continued “The up-cycling of clays and their transformation into a low-carbon binder addresses several challenges for the construction sector. On the one hand, the reuse of clay waste, and on the other hand, the decarbonisation of the building materials sector.”