Displaying items by tag: Ash

Italy: Cemitaly has been allowed to use slag and ash in cement production at its Taranto plant following an investigation, according to the Il Fatto Quotidiano newspaper. The former Cementir unit was investigated in 2017 as part of an illegal waste probe that examined whether the Taranto plant purchased ‘illegal’ by-products from Enel and the ILVA steel plant to produce cement.

UK: The UK Quality Ash Association (UKQAA) has appointed Tarmac’s Allan Everett as the association’s new chair, taking over from Power Minerals’ Ivan Skidmore. Everett will be joined by Richard Boult, who has also been announced as the UKQAA’s new Technical Committee Chair. Boult is Commercial Technical Manager at Cemex UK. He will work with UKQAA’s Technical Committee members to develop and assess technical projects exploring new sources and uses for quality ash.

The UKQAA is an industry association for the use of quality ash in construction and engineering applications and represents a range of members from across the construction supply chain.

Chile: AES Gener is exploring options to sell by-products from its Guacolda coal-fired power station to cement producers. The power-generation company has asked for permission to do so and has approached Polpaico, owned by Holcim, and BSA, owned by Hurtado Vicuna group, according to the Diario Financiero newspaper. Guacolda produces around 40,000t/yr of synthetic gypsum and 60,000t/yr of Ash. AES Gener is already selling 30,000t/yr or half of the ash generated at its Ventanas power plant, to Melón. The company also has agreements in place with a number of universities to explore the use of these materials in concrete, cement, agriculture and mining activities.

US: Georgia Power has started preparation activity to permanently close all of the company's 29 ash ponds located at 11 coal-fired generation facilities across Georgia. Twelve ponds are scheduled for closure by mid-2018, 16 are expected to close by 2026 and one pond is expected to close by 2030. At present, around 50% of the coal combustion by-products Georgia Power produces are used to make Portland cement, concrete, cinder blocks and gypsum wallboard.

"Our primary focus throughout the closure process is maintaining a reliable generation fleet, while conducting the closure process in the most efficient way possible," said Mark Berry, vice president of environmental affairs for Georgia Power. The company will upgrade each plant to accommodate the dry handling of Coal Combustion Residuals (CCR) required by new federal regulations. The closure of all 29 ash ponds is expected to cost over US$1bn over the next 10 years. In addition, the company has invested approximately US$5bn in new environmental compliance technologies for its coal-fired generation fleet.

US: According to Charlotte Business Journal, Duke Energy has proposed excavating 12 more of its 36 coal ash ponds in North and South Carolina and burying the waste in a fully-lined landfills or structural fill projects.

To date, Duke has proposed closure plans for 24 of the 36 ash ponds. In every case, it has proposed excavation and reburial. However, Garry Miller, head of closure engineering for Duke, said that might not be the case for the remaining 12 ponds. He said that the engineering work that remains to be done at those plants could yet show that a 'cap in place' process, which critics have said would be insufficient to protect against further contamination of groundwater, can effectively close them.

Miller said that none of the waste ash from Duke's 36 ash ponds would undergo beneficial reuse, the process of using the ash for commercial products such as a replacement for Portland cement in concrete and gypsum board. However, he added that Duke does send a portion of the dry ash it is currently producing at its largest plants for reuse. However, the time constraints imposed by North Carolina's Coal Ash Management Act of 2014 make it impossible for the existing ash ponds. "As we close these basins, the quantity in them is such that the market cannot handle it in a timely manner," said Miller.

Duke's current cost estimate for closing the ponds is US$3.4bn, although this is subject to revision.

Canada: A British Colombia programme that recycles Keurig coffee K-Cups into cement has been so successful that it may expand into Alberta. The Lafarge cement plant in Kamloops, British Colombia, Canada used about 1.4m K-Cups as ash in its cement in 2014 after teaming up with Van Houtte Coffee Services, which collects the used pods for recycling.

"I think we've been fairly successful here," said Eric Isenor, the Lafarge Kamlooops plant manager. "Van Houtte is happy with the programme so far and is looking to expand." He added that the company might start collecting the used pods in Alberta, Canada for recycling in British Colombia.

The single-serving coffee pods are not recyclable because they are a mixture of materials coffee grounds, a paper filter, plastic cup and foil top that cannot be efficiently separated. After collecting the used coffee pods, Van Houtte, a coffee service that delivers supplies to offices and retailers around Kamloops, brings them in large bins to the Lafarge cement plant for processing. The pods are dried out, shredded and heated to 2000°C to form ash, which is then used for cement production.

Philippines: Lafarge Republic and the Global Business Power Corporation (GBPC) has launched an initiative aimed to lower the costs of rehabilitation projects, such as the rebuilding efforts for Yolanda and the Bohol earthquake-affected areas, through the introduction of a ash-based cement called called Kapit-Balay cement.

Kapit-Balay cement is a result of the Total Ash management partnership between Lafarge Republic and GBPC. Under this collaboration, Lafarge uses the fly ash from GBPC's power generation processes to produce blended cement. Under the partnership, the two companies worked on optimising the cost of producing the ash-cement, which enables them to contribute in lowering the overall cost of rebuilding with the additional support from Lafarge's packaging partner and a direct sales distribution model to rehabilitation projects.