Method for dissolving residues containing non-noble metals generating hydrogen in contact with halohydric acids and noble metals in metallic or alloyed form

摘要

Divided non-precious and precious metal-containing material dissolution involves adding to a non-acidic halide ion-containing oxidizing solution, adding an aqueous halogen acid solution and adjusting to a specified minimal hydrogen ion concentration. A process for dissolving divided material containing non-precious metals which evolve hydrogen in contact with hydrohalic acids and precious metals in metallic or alloyed form, comprises: (a) introducing the material into a non-acidic halide ion-containing oxidizing solution at 70-90 degrees C, the solution having a halide concentration of NOTLESS 1 mol/l and forming a halogen compound with hydrohalic acids; (b) adding an aqueous solution of a halide ion-forming acid to dissolve the metal components; and (c) adjusting the solution to a minimal hydrogen ion concentration of 1 mol/l by adding a hydrohalic acid.