The recovery of copper by iron in copper sulfate aqueous solutions was studies as a function of the external magnetic field and morphologies of iron containing steel samples. Essential retardation of the recovery by the magnetic field was found as well as decrease of iron sulfate solubility in water induced by the field. The retardation is explained by the active participation of inter-domain walls in the recovery and decreasing of their length in the magnetic field. When steel filings were used for the recovery instead of the volume samples the magnetic retardation was not notices. Applications of these results are developed for new methods of lithography of microschemes and restoration of electrical contact wires.