World first: Dutch brewery burns iron as a clean, recyclable fuel

Many industries use heat-intensive processes that generally require the burning of fossil fuels, but a surprising green fuel alternative is emerging in the form of metal powders. Ground very fine, cheap iron powder burns readily at high temperatures, releasing energy as it oxidizes in a process that emits no carbon and produces easily collectable rust, or iron oxide, as its only emission. Source: World first: Dutch brewery burns iron as a clean, recyclable fuel