Displaying items by tag: Ash

Germany: Scientists at the University of Kassel in Hessen have launched a study into the use of ash from waste incinerators in precast concrete production. The Hessische Allgemeine newspaper has reported that a waste-to-energy plant in Kassel will provide the ash for concrete production in partnership with local companies Kimm Baustoffe and Gebäudeke Baustoff-Recycling. The study aims to produce pre-cast concrete elements containing at least 30% ash, beginning with paving slabs and noise barriers.

Project leader David Laner said that ash has the potential to help lower concrete’s carbon footprint. He said “So far, it has been put to lesser-value uses; we make a product out of it - upcycling instead of downcycling.”

Australia: Researchers from Murdoch University in Western Australia have developed a cement-free concrete called Colliecrete. ABC News has reported that the concrete comprises of 80 – 90% fly ash. Other ingredients are bauxite residue and recycled aggregates. Developer Ramon Skane said that customers can make Colliecrete ‘anywhere, at room temperature.’

US: Titan America, part of Greece-based Titan Group, has launched ProAsh and EcoTherm. Both products are made from ash reclaimed from landfill and can be used in both cement and concrete production. Titan America subsidiary Separation Technologies produces the materials at its Brunner Island reclaimed ash drying and electrostatic separation plant in Pennsylvania.

President and chief executive officer Bill Zarkalis said, “This breakthrough achievement represents Titan America’s commitment to the reduction of CO₂ through innovation as we plan to deploy this technology across the construction material sector.” He added “By harnessing the power of this technology, Separation Technologies is utilising a revolutionary beneficiation process that is capable of converting reclaimed ash from ash basins in an efficient manner. The result is a high-grade, low carbon construction product.”

US: Energy company Luminant has awarded Charah Solutions a fly ash management contract extension for its Miami Fort and Zimmer coal-fired power plants in North Bend and Moscow, Ohio. Charah Solutions says that it will pass on the ash for use in concrete production. It will continue to manage the onsite landfill and impoundment operations under its existing contract with Luminant, including material loading, hauling and disposal of approximately 180,000t/yr. In addition, Charah Solutions will be responsible for the beneficiation and utilisation of approximately 400,000t/yr of fly ash. The contract ends in 2027, when both power plants are expected to close.

President and chief executive officer Scott Sewell said “We have been proud to partner with Luminant on its sustainability efforts for many years and are delighted to extend our relationship at these Ohio sites through 2027. We have dramatically reduced the need to landfill fly ash at Miami Fort and Zimmer through our on-going partnership, saving Luminant both expense and valuable landfill space while lowering their risk.” He added “As a result of this expanded agreement, Charah Solutions will continue to provide a reliable supply of high-quality fly ash to ready mix concrete producers in the Midwest, Northeast and deep South through our MultiSource network.”

Belarus: Belarusian Cement Company subsidiary Krasnoselskstroimaterialy has reported total costs savings across its operations of Euro1.34m in 2020. Belarus: Daily News has reported that the company undertook several and diverse measures to achieve the reduction.

The company said, "We have replaced imported bottom ash mix with high-aluminium clay from our own deposit.” It added, “The coal content of the fuel mix rose to 85%. We have also optimised the use of raw materials in the production of cinder blocks. This has helped to reduce the cost of their production by means of decreasing the usage rates for cement, lime and thermal energy."

US: Charah Solutions has been awarded a marketing contract by Dominion Energy for the beneficiation and utilisation of up to 8.1Mt reclaimed ponded coal ash at its Chesterfield Power Station in Chester, Virginia. The contract will run from 2021 until 2032. It follows local state legislation requiring the power company to remove coal ash from sites at the Chesterfield Power Station within 15 years.

As part of the agreement, Charah Solutions will install processing and transportation infrastructure in 2021 to facilitate rail transportation of the ash from Chesterfield Power Station to cement kiln feed markets. The beneficiated ash product will replace other currently utilised virgin raw materials in the production of Portland cement at multiple cement kiln locations in the eastern US for the next decade and beyond, and help supply the growing demand for concrete in the construction industry.

US: Georgia Power will begin dewatering three ash ponds at its Mitchell power plant in Albany, Georgia. The company says that the coal ash will be used in local cement production.

Environmental and natural resources vice president Mark Berry said “As we begin the dewatering process at Plant Mitchell, we continue to focus on safety and meeting all requirements throughout the process to fulfill our longstanding commitment to protect the environment, our local communities and water quality every step of the way." He added “Throughout the process, clear communication to our customers and the community about our progress remains a priority."

With the Plant Mitchell project, approximately 2Mt of stored coal ash will be removed from the existing ash ponds for reuse in cement manufacturing. The project at Plant Mitchell marks the first time that stored ash from existing ash ponds at sites in Georgia will be excavated for beneficial reuse as part of an ash pond closure project. At present Georgia Power recycles more than 85% of all ash and gypsum, including more than 95% of fly ash, it produces from current operations for various beneficial reuses such as concrete production as well as other construction products.

Philippines: Aboitiz Group food and agriculture subsidiary Pilmico Foods says that it has developed a waste ash-based concrete mix that contains 20% less cement than its previous mix and that “can be used for all of the company’s construction needs.” The Manila Bulletin newspaper has reported that the ash is sourced from burnt rice husks, a fuel source for Pilmico’s food production and itself a by-product of its operations. Central Maintenance Department mechanical supervisor Michael Cayabyab said, “When we started using the biomass boiler almost two years ago, we saw process improvements and reduced costs. But in Pilmico, we know that the challenge does not stop there." The company has yet to commercialise the concrete, however it hopes to inspire others with its “demonstration of the circular economy demolishing the divide between industries.”

India: State-owned energy supplier NTPC Limited has announced the shipment of 3450t of fly ash from its 3.0GW Rihand power station in Uttar Pradesh to Switzerland-based LafargeHolcim subsidiary ACC Cement’s 3.0Mt/yr Tikaria grinding plant, also in Uttar Pradesh. The Orissa Diary newspaper has reported that the shipment – the first from a new purpose-built rail depot – over 458km is part of NTPC Limited’s commitment to 100% total fly ash utilisation, up from 73% in the 2020 financial year, ended 31 March 2020. ACC supply chain head Suresh Rathi said, “This will pave the way for efficient and safe transportation of all fly ash from power plants to cement production units located at a distance in larger quantity.”

NTPC Limited generates some 60.5Mt/yr of fly ash alongside 62.9GW of power.

US: Charah Solutions has secured a contract with energy supplier Entergy for provision of environmental services to three coal-fired power plants in Louisiana and Arkansas. The gives Charah Solutions the right to dispose of or market 0.9Mt/yr of coal combustion residuals (CCR), including to cement producers in the region for use as a cement additive.