This came up a while back here; the idea is that you would burn the iron powder, then re-generate the iron oxide waste with electrolysis preferably using renewable energy. So iron becomes an energy transport and storage mechanism instead of a single-use fuel.
Seems like it would be more efficient to use the renewable energy directly or failing that, use the electrolysis to create hydrogen and burn that, but I guess that comes down to how efficient the regeneration process is and cost of transport.
Seems like it would be more efficient to use the renewable energy directly or failing that, use the electrolysis to create hydrogen and burn that, but I guess that comes down to how efficient the regeneration process is and cost of transport.
https://gizmodo.com/a-dutch-brewery-is-burning-iron-powder-a...