Displaying items by tag: Study

Canada: Ash Grove Cement, part of CRH, says it will release the findings of technical studies supporting its plan to burn alternative fuels at its Mississauga cement plant. Ash Grove plans to burn materials such as construction and demolition waste, wood, plastics and rubber.

The company says the initiative will reduce fossil fuel emissions by limiting its current reliance on coal, while also diverting materials from landfill.

Germany: KHD will carry out a front-end engineering design (FEED) study for the new oxyfuel kiln at Heidelberg Materials' Geseke cement plant, part of the GeZero carbon capture and storage (CCS) project. The project will capture and store around 0.7Mt/yr of CO₂.

Matthias Mersmann, chief technology officer at KHD, said "At KHD, we have long recognised oxyfuel technology’s potential for cement decarbonisation and are well-positioned to contribute to this important flagship project.”

Germany: Heidelberg Materials has started the Front-End Engineering Design (FEED) Study phase on the GeZero project at its Milke plant in Geseke. The technical planning phase is being conducted by Fluor Corporation. It will focus on the design and integration of the various systems into the overall technical concept, which also includes a CO₂ transport solution. The technical planning is expected to be completed in mid-2025 with construction scheduled to start in 2026.

Christian Knell, CEO of Heidelberg Materials Germany, said “With GeZero, Heidelberg Materials will rely on CO₂ capture using state-of-the-art oxyfuel technology in combination with a CO₂ cleaning and liquefaction plant. To pave the way for domestic CCS plants, a CO₂ transport solution by rail is part of the planning until the necessary pipeline infrastructure is available. In addition, a local CO2 storage hub is to be created as interim storage. The electrical energy requirement for the operation of the plant is to be covered exclusively by renewable energies. A new photovoltaic system in the vicinity of the factory premises will help to meet the needs.”

The GeZero project is preparing to build a carbon capture and sequestration (CCS) value chain for the Geseke cement plant, North Rhine-Westphalia, in inland Germany. It aims to capture 0.7Mt/yr of CO₂ starting from 2029. The project is supported by the European Union Innovation Fund.

UK: A new study by the Mineral Products Association (MPA), supported by Innovate UK, has found that incorporating reclaimed clays and finely ground brick powder into cement production can reportedly lower the embodied CO₂ by up to 3%. The materials are used as calcined clay in the cement production process. The project aims to offer a viable alternative to fly ash and ground granulated blast-furnace slag, as resources diminish due to the steel industry's decarbonisation efforts.

MPA director Diana Casey said "Using discarded bricks and reclaimed clays will not only lower carbon and reduce the amount of materials sent to landfill but has the potential to create a whole new market if these clays become widely used in the construction industry, helping to retain economic value in the UK, secure jobs and attract investment."

Germany: Canada-based company Rock Tech has promoted a peer-reviewed study by the German Lithium Institute that confirms the potential of byproducts from lithium production to be used in cement manufacture. The study found that leached spodumene concentrate (LSC), primarily composed of aluminosilicates, can replace fly ash as an additive in the cement industry. The study also revealed that adding 20% LSC to Portland cement increases its compressive strength by 10%. The process for producing and utilising LSC has been submitted for a patent.

"The phase-out of coal and the transformation of the steel industry will sooner or later lead to changed or disappearing material streams that have been significant for the cement industry in terms of CO₂ savings and product portfolio. The LSC from lithium production has the potential to compensate for these depleting material streams in the future."

Thailand: Siam Cement Group has awarded JGC Corporation the pre-feasibility study for a carbon capture and utilisation (CCU) facility at a cement plant in Thailand. The study will determine the technology license, assess the required production capacity for CO₂ capture facilities and evaluate the economic feasibility of constructing a CCU facility, which will capture and convert CO₂ from SCG's cement plant emissions into new chemical products.

Australia: The Australian federal government has granted Adbri US$32.5m for a new front-end engineering and design study at its Birkenhead cement plant. The study will assess the possible installation of a new vertical roller mill and post-production blending system at the plant. InDaily News has reported that the proposed upgrade will increase the plant’s production capacity and help to expand its range of reduced-CO₂ cements. The funding falls under the government’s US$260m Critical Inputs to Clean Energy programme, which aims to help decarbonise the Australian economy by 2050.

CEO Mark Irwin said “With the Commonwealth’s support we have the potential to further accelerate the decarbonisation of our operations and products.”

Pakistan: On 18 April 2024, the Sustainable Development Policy Institute (SDPI) and the Policy Research Institute for Equitable Development (PRIED) launched two studies focusing on the decarbonisation of Pakistan's cement sector. The initiative focuses on collaboration and technology sharing to reduce the industry's carbon footprint.

Professor Muhammad Fahim Khokhar from the National University of Science and Technology (NUST) said "The global CO₂ emissions released from the cement sector are 37.4Gt, which is rising at 1.1% per year."

The study by PRIED and NUST showed a 30% increase in cement sector CO₂ emissions in 2020 relative to 1990-2000, reaching 49.6Mt/yr. The study proposed strategies for cement sector decarbonisation, such as alternative fuels, clinker substitution, renewable energy, process electrification, energy efficiency and carbon capture technologies.

According to researcher Saleha Qureshi, the major challenge for decarbonisation is that cement industries in Pakistan rely on over 65% coal in the calcination process. Other challenges identified were lack of regulatory and policy support, absence of performance-based standards, high transition cost and limited incentive available for the transition.

China: A new study from Hong Kong Polytechnic University showcases sustainable cement production methods, focusing on low-clinker cements and alternative solutions for incinerator fly ash (IFA). The research demonstrates that using carbonated-washed IFA mixed with slag, coal fly ash, or metakaolin can replace 60% of Portland cement, forming ternary blended cement. This approach reportedly reduces the carbon footprint of cement production.

The study found that slag was the most effective, improving pore structure and increasing ettringite and hemicarboaluminate formation with a blend of 40% slag and 20% IFA. It achieved 90% of the compressive strength of pure Portland cement after 90 days.

The researchers said "This study demonstrated the promising potential of the blended cements to simultaneously divert IFA from landfills and reduce the clinker content of cement."

Philippines: A recent study from Cebu, Philippines presents a method for reducing greenhouse emissions in the cement industry. The research, supported by the Department of Science & Technology (DOST) of the Philippines, focuses on partially substituting cement with coal fly ash (CFA). According to the University of San Carlos researchers, CFA's efficacy as a cement substitute depends on its source, with variations in quality, performance, and water requirements when used in paste and mortar formulations.

The study evaluated CFA from a Philippine power plant, examining its use as a partial cement substitute. Researchers designed paste and mortar mixtures with different CFA-to-binder ratios and water-to-binder ratios. The study revealed that increasing the amount of CFA in cement up to 20% by weight could enhance compressive strength, ‘outperforming’ pure cement mixtures.

The study concluded that substituting a portion of cement with CFA not only reduces greenhouse gas emissions but also improves the compressive strength of the resultant material.