Applicability of fine industrial metallic iron-rich waste powders for hydrothermal production of hydrogen gas: The influence of non-ferrous contaminants

Finally, three industrial iron waste powders were treated according to the same hydrothermal treatment. Hydrogen gas formation for an iron-rich foundry sand (IWP-A) was inhibited by the formation of a silicate deposit on the iron particles, while the hydrogen gas production from iron works' waste powders (IWP-B and IWP-C) increased with decreasing particle size of the metallic iron particles in the powder.