Indian aluminium producer Vedanta Aluminium is searching for partnerships from cement producers to put to use its waste product to produce low-carbon cement. Vedanta commented its interest in utilizing fly ash and bauxite residue in a conference hosted by industry experts.
Vedanta notes that fly ash and bauxite residue are produced in large quantities by the aluminium smelting process Fly ash can replace up to a third of the cement used in concrete production, while bauxite residue can replace raw bauxite, making the concrete produced stronger and more impervious to water.
Deputy CEO Rahul Sharma said in a press release that his firm has already made good progress on sustainability due to partnerships similar to these.
“We firmly believe that industries must develop waste-to-wealth value-chains to truly become sustainable. At Vedanta, we have made encouraging progress in this direction and intend to pursue it further. Long-term strategic collaborations, such as between Vedanta and India’s key cement producers, will not only eliminate significant volumes of industrial waste from the system, but also provide the trifecta of quality, sustainability and cost benefits for the cement industry. We hope the Indian cement producers come forth to work with us on this innovative solution, which is a true win-win scenario for the industry and environment.”
Veteran concrete technologist Robin De Beer commented on the advantages of using fly ash.
“Good quality fly ash can help reduce water demand, lower heat of hydration and significantly enhance workability of concrete, resulting in long-term strength and durability. This technical workshop is a great initiative by Vedanta to create awareness on how fly ash can support the sustainability agenda of the cement and concrete industry, while significantly improving the product performance.”
“Bauxite residue has multiple advantages in cement manufacturing, such as lower silica relative to laterite/bauxite, higher alkali content and fine particles, which reduces grinding cost,” noted Shreesh Khadilkar, an executive in the Indian cement industry. “It also improves hydraulic properties of cement. Indian cement industry should leverage this innovative opportunity to reap benefits of quality and sustainability.”
Vedanta currently supplies tens of thousands of metric tons of fly ash and bauxite residue to cement manufacturers throughout India.