Process for dissolving precious metals contained in residues comprises slurrying the residues with concentrated hydrochloric acid, and feeding hydrogen chloride gas and chlorine gas through the slurry

摘要

Process for dissolving precious metals contained in residues comprises slurrying the residues with concentrated hydrochloric acid; and feeding hydrogen chloride gas and chlorine gas through the slurry. Preferred Features: The precious metals present are Ag, Au, Pd, Pt, Ru, Os, Rh or Ir. The hydrogen chloride gas and chlorine gas are used in equimolar amounts. The residues are present as a finely distributed suspension in the hydrochloric acid. The second step of the process is carried out at more than 70 deg C. The hydrogen chloride gas and chlorine gas are mixed together in a mixing chamber and then fed through a tube onto the liquid surface.