Traditionally, metals are not considered combustible. But, as it turned out, metals burn very well. A group of researchers at McGill University has developed a technology for converting metals into fuel, for which they must be crushed to a powder state.
As you know, flour and powdered sugar under certain conditions turn into an explosive, so the corresponding production facilities are thoroughly ventilated. In terms of their properties, metal powders are in many ways similar to them. Moreover, practically everything (even the earth) in the state of the smallest particles becomes fuel.
Examples of this are metal and aluminum powders used as dye for fireworks and solid rocket fuel. In the course of laboratory tests, scientists have found that the flame of metal powders is very similar to a "hydrocarbon" flame, and in terms of the energy released and the level of density, it is comparable to that of an internal combustion engine, heat and steam engines.
Powdered metallic fuel has a number of advantages. It is easier and safer to transport and, most importantly, it is recyclable. As they burn, metal powders form stable, non-toxic solid oxides, which can then be collected, separated from them pure metal and reused with minimal release of carbon dioxide and other combustion products.