This iron originally took considerable energy to turn it from rust into iron, when it's burned it becomes rust again. Presumably, this will be useful on a smal

This iron originally took considerable energy to turn it from rust into iron, when it's burned it becomes rust again. Presumably, this will be useful on a small scale to absorb certain types of scrap iron and steel that is contaminated with other elements that would make it unsuitable for normal recycling. High quality iron would be better off being recycled, as the huge amount of energy originally expended in its reduction from oxide to iron doesn't have to be expended on the production of new iron.