METHOD OF REMOVING PRECIOUS METALS FROM MATERIAL CONTAINING THEM Russian patent published in 2005 - IPC

FIELD: precious metals technology.

SUBSTANCE: method comprises treatment of initial material with reagent solution under microwave irradiation to transfer precious metals into solution. Initial material is preliminarily subjected to mechanical activation during 5 to 120 min while maintaining ratio of mechanical power supplied to specific surface area of activated material within a range of 0.0133 to 25 W-kg·m². Microwave treatment starts directly after mechanical activation using acid and/or oxidant to form slurry from activated material and reagent solution. Irradiation is carried out to boiling temperature. Acid and/or oxidant is selected from HCl and/or Cl₂, HCl and/or H₂O, HCl and/or Br₂, HCl and/or NaClO₃, HCl and/or HNO₃, HF and HCl and/or NaClO₃, mixtures of H₂SO₄ and HCl and/or H₂O₂, mixtures of HCl and HBr and/or H₂O₂, _{mixtures of HCl and HI and/or NaClO3 and J2, HCl and/or Cl2 and Br2.}

EFFECT: increased degree of precious metal recovery.

3 cl, 13 ex