Displaying items by tag: Research

Switzerland: Holcim has commissioned the world's first cement plant digital twin at one of its cement plants in Switzerland. The software models the plant and is integrated with sensors, analytics and machine learning technology. UK-based HyBird also participated in the development of the technology. Holcim expects it to help to optimise its operations. Under its Plants of Tomorrow automation strategy, it will now aim to roll out the system across all of its cement plants, beginning with those in Europe.

Holcim's global head of Plants of Tomorrow, Rozemarijn Wesby, said "Our digital twin in Switzerland is a breakthrough for the entire industry. By leveraging digital technologies like this, we are generating massive amounts of data, allowing smarter decision-making to take our operational efficiency to the next level."

Vietnam: Analysis by SSI Research forecasts that the reopening of the Chinese economy, following its change in public health policy towards Covid-19, should increase cement exports in the second half of 2023. If this happens it is expected to reduce competition between producers in central and northern regions, according to the Việt Nam News newspaper. Signs of a recovery in cement exports to China were already noted in the fourth quarter of 2022. However, an increase in clinker export tariffs from the start of 2023 may presents a fresh issue for the producers. Cement and clinker exports from Vietnam fell by 29% year-on-year to 31.7Mt in 2022.

Cement 2 Zero (C2Z) has officially launched in the UK this week. The project is an industrial scale pilot of the Cambridge Electric Cement (CEC) process. The Materials Processing Institute will lead on this stage with two-year funding of around Euro7m provided by UK Research and Innovation (UKRI). Partners include the University of Cambridge, Atkins, Balfour Beatty, Brewster Brothers, Celsa Group, Day Aggregates and Tarmac.

CEC’s method uses recycled concrete paste in place of lime-flux in steel recycling. Slag is formed as the steel melts and this is then used in place of clinker to make more cement. This way of making cement cuts out the decarbonisation of limestone step from conventional clinker production. If renewably-sourced electricity is used to power the heating and grinding parts of manufacture, then cement production in this way could potentially cut out most of its CO₂ emissions. The first phase of trial melts by C2Z will be conducted by the Materials Processing Institute using a 250kg induction furnace and this will be scaled up to 6t in an electric arc furnace (EAF). Later, industrial scale melts will be tested in Celsa Steel's EAF in Cardiff, Wales.

CEC is taking a similar approach to HeidelbergCement with its research into using recycled concrete paste. However, HeidelbergCement says it is using the paste to help capture CO₂ in an enforced carbonation step it is testing at cement plants. It too though wants to create a secondary cementitious material (SCM) afterwards. There are also links here to construction and demolition waste and electric cement kilns as covered by Global Cement Weekly previously. The latter is different with regards to what CEC is doing because it is recycling concrete waste to produce an SCM (slag) rather than using an electrically powered kiln to make clinker from limestone. Coolbrook, VTT and the like have had to build electric kilns effectively from scratch or adapt technology from elsewhere for their approaches whilst CEC appears to be about to use existing EAFs in its industrial scale pilot.

Figure 1: Projection of how the Cambridge Electric Cement production process could be used at scale in the UK. Source: UK FIRES. Click to view larger version.

CEC’s forecast of how its process could be used at scale in the UK can be seen above in Figure 1. If the majority of the country’s steel scrap was recycled in this fashion each year then 2.4Mt/yr of CEC cement could be produced. This would represent a quarter of the c10Mt of cement sales reported by the MPA in 2021. Assuming the EAFs were powered by renewables then this could reduce the cement sector’s CO₂ emissions significantly. Although it would still leave the industry looking for other decarbonisation routes for the other three-quarters of cement demand.

C2Z and CEC offer a novel spin on cement production by recycling concrete waste, using an electrical heating step and dodging the process emissions associated with normal ordinary Portland cement (OPC) clinker production. If it did progress to a commercial stage then it would see a continued relationship between steel and cement producers. Currently this is mainly centered around iron and steel slag usage as a SCM. One point of interest here would be how much higher levels of steel recycling and a process like CEC being used regularly would affect existing slag usage as an SCM. It doesn’t look like CEC could solve the cement sector’s CO₂ emission problem all on its own but it could certainly make a difference if it progressed to a commercial stage. As ever with cement sector decarbonisation there appear to be a range of options available to producers.

US: The Department of Energy’s (DOE) Carbon Storage Assurance Facility Enterprise (CarbonSAFE) initiative has awarded funding of US$8.9m to Heidelberg Materials North America to study the subsurface geology for suitability for the storage of carbon dioxide at the Mitchell integrated cement plant in Indiana. The proposed project will geologically characterise several prospective reservoirs under the Mitchell plant for storage of more than 50Mt of CO₂ over a 30-year timeframe.

The award, which is managed by the National Energy Technology Laboratory, will be issued to the Illinois State Geological Survey at the University of Illinois (ISGS) as the prime contractor, with the company acting as a technical and industrial partner. Heidelberg Materials is contributing about US$1.5m in funding while ISGS will be contributing approximately US$0.6m for a project total of US$11.1m. The funding was part of a DOE initiative that generated nearly US$125m in funding for 10 projects to characterise suitability for carbon storage across the US.

Heidelberg Materials’ Mitchell cement plant is being upgraded with a new production line. Full production on the new line is anticipated to start in early 2023.

China: China Resources Cement (CRC) has inaugurated its Cement International Innovation Centre. The producer says that the centre will contribute to the sustainable growth of its operations across three platforms, namely: cutting-edge research and development, international technologies exchange and international talent introductions.

CRC chair Ji Youhong said that the start of operations at the Cement International Innovation Centre constituted a 'major achievement' under the government's 14th Five Year Plan.

Philippines: Holcim Philippines carried out 70 upgrades aimed at increasing automation in its operations during 2022. The projects aim to optimise cement production, generate cost savings and ensure best safety practices. The Manila Times has reported that new Industry 4.0 initiatives include equipment monitoring systems offering 90-day performance projections, software capable of predicting cement's strength development and drones to replace visual inspections in remote spaces.

Holcim Philippines said that it is currently exploring the use of new predictive technologies in its operations.

China: Gansu Shangfeng Cement has announced plans for the establishment of a new building materials digital intelligence research company. Local press has reported that the company will function as a joint venture of a Gansu Shangfeng Cement subsidiary and another company. Gansu Shangfeng Cement says that the new venture will have registered capital of US$70.3m.

UK: Denmark-based architecture fund Henrik Frode Obel Foundation has named Seratech as winner of its Obel Award 2022. The award recognises architectural contributions to global development. Seratech has developed an olivine-based composite cement produced using CO₂ from flue emissions, which can sequester double the CO₂ of ordinary Portland cement (OPC). When used as 40% of a blend with OPC, it is able to completely offset the emissions of concrete production.

Team member Barnaby Shanks said "The beauty of the idea is that you can just use it as normal concrete. There are other carbon-neutral materials, but they can be limiting because they can only be precast, cured in a lab in special conditions and shipped elsewhere. We want people to retain the freedom to use concrete the way that they are used to. We don’t want to limit people in any way because we’ll just lessen the amount of impact we can have."

Denmark: Switzerland-based Holcim has made an investment in 3D concrete printer supplier COBOD International. Holcim hopes that the investment will help it to further expand its TectorPrint 3D printing ink range. Holcim and COBOD International's collaboration dates to 2019, since which time the partners have 3D printed windmill tower bases in Denmark, a school in Malawi and a housing development in Kenya.

Holcim's head of global research and development Edelio Bermejo said “At Holcim, we are continuously expanding our range of building solutions to build better with less, working to improve living standards for all in a sustainable way. 3D concrete printing will help us meet these goals."

US: Heliogen is among recipients of a total US$24m in US Department of Energy funding for solar thermal power projects. The department granted it US$4.1m-worth of funding for a project in which it will calcine limestone at 950°C using the heat of the Sun. Heliogen hopes to apply the methods it is developing to prevent the direct emissions of cement production.