Аннотация
The catalytic properties of metal copper in chemical reactions between ferrite – garnet materials and orthophosphoric acid are described. It is shown that the most qualitative reactions are with copper coated nano- and microparticles of iron and etching agent stirred by magnetic fields. The metal copper is formed on iron particles by electro less method through reaction between iron particles and aqueous solution of copper vitriol and sulphuric acid, the stirring is the most effective with the application of variable magnetic field gradient.