METHOD OF RECOVERING PRECIOUS METALS FROM MATERIAL CONTAINING THEM Russian patent published in 2004 - IPC

FIELD: precious metal technology.

SUBSTANCE: method comprises treatment of starting material with a reagent under microwave irradiation to transfer precious metals into solution. Treatment is carried out, in particular, with acid and/or oxidant as reagent to form suspension of starting material and reagent, which suspension is then subjected to vibration stirring realized by vertical vibration of suspension by maintaining product of amplitude by circular frequency within the range 0.15-1.0 m·rad·s^-1. Irradiation is effected until boiling temperature is attained. Acid and/or oxidant utilized can be HCl and/or Cl₂, HCl and/or H₂O₂, HCl and/or Br₂, HCl and/or NaClO₃, HCl and/or HNO₃, mixture of HF and HCl and/or HNO₃, mixture of H₂SO₄ and HCl and/or H₂O₂, mixture of HCl and HBr and/or H₂O₂, mixture of HCl and HI and/or NaClO₃ and I₂, HCl and/or Cl₂ and Br₂.

EFFECT: increased degree of precious metal recovery.

3 cl, 11 ex