Displaying items by tag: recycling

India: The Samruddhi Expressway stretches 701km from Nagpur to Mumbai. This project by the Maharashtra State Road Development Corporation (MSRDC) has been focused on reducing environmental impact by the use of fly ash and blast furnace slag in its concrete.

Anil Gaikwad, managing director of the MSRDC, said "Fly ash and ground granulated blast furnace slag were also used in the concrete,” He continued “Fly ash has been used to the extent of 20% in the concrete."

The project emphasised circularity by reusing and recycling materials. Responsible sourcing of materials was a key component, ensuring vendors complied with environmental standards. Innovative water management strategies were also implemented, including the creation of farm ponds through agreements with local farmers.

Australia: Australian Steel Mill Services (ASMS) and the University of Wollongong have launched an investigation into the possible industrial uses of steel furnace slag (SFS) at the Steel Research Hub in Wollongong, New South Wales. ASMS says that SFS has historically had a lower recyclability than ground granulated blast furnace slag (GGBFS) because of its behaviour when hydrated, which potentially includes expanding. The research team believes that SFS might be a possible ingredient for construction materials, including paving slabs. Tests will involve mixtures of SFS with cement, lime, lignosulphonate, coal wash and plastics.

UK: A team of researchers from six UK universities has filed a patent for a clinkerless cement product called Cambridge Electric Cement. Local press has reported that the project, called UK Fires, saw researchers successfully produce the cement using renewable power from recycled cement powder and ground granulated blast furnace slag (GGBFS). Following its successes, UK Fires has obtained a further Euro2m in funding from the UK Engineering and Physical Sciences Research Council (EPSRC) to continue its work into the range of concrete wastes suitable for use in Cambridge Electric Cement production.

Russia: The National University of Science and Technology (NUST) MISiS and Vtoraluminprodukt have launched a pilot installation of a bubbling reactor, using the gas flushing principle, in Mtsensk, Oryol Region on 18 December 2018. The concept is intended to fully process industrial waste, slags and sludge, as well as carbon-containing wastes, including municipal solid waste (MSW) and efficient and environmentally-friendly production of iron and concentrate non-ferrous metals. NUST MISiS says that the furnace is the world's only metallurgical furnace capable of processing iron-containing industrial waste as well as solid waste, simultaneously smelting up to 16,000t/yr of metal and producing electricity.

"The advantage of this technology is that it is non-waste and allows for simple, reliable and environmentally-friendly purification of the exhaust gases. And it also allows combining the processing of metallurgical waste, coal preparation factories and municipal waste of enterprises or settlements that are heated with coal. It is a sort of a universal technology," said Nikolay Shenchenko, member of the Expert Mining Committee of the State Duma of the Russian Federation for industry and innovation and the chief executive officer (CEO) of Resmet.

Gennadiy Podgorodetskiy, team leader and director of the Innovative Metallurgical Technology Scientific and Educational Centre, said that the slag composition from the pilot furnace can be selected for further processing into slag stone products, thermal insulation slag or be used to make slag cement products.

Japan: Steel slag production fell by 2.1% year-on-year to 36.7Mt in the financial year that ended in March 2018, according to Japan Metal Daily. This was attributed to increasing levels of slag recycling rates with nearly all of the blast furnace slag being reused.