METHOD OF PROCESSING SULPHIDE CONCENTRATES CONTAINING PYRRHOTINE, PYRITE, CHALCOPYRITE, PENTLANDITE AND PRECIOUS METALS Russian patent published in 2020 - IPC C22B11/06 C22B3/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to non-ferrous metallurgy, particularly, to hydrometallurgical processing of sulphide concentrates containing non-ferrous metals, iron and precious metals. Processing of sulphide concentrates containing pyrrhotine, pyrite, chalcopyrite, pentlandite and precious metals includes autoclave oxidative leaching of initial sulphide concentrate, processing of residual leaching according to burning-chlorination scheme and extraction of precious metals from chlorination solutions. Content of basic elements in initial sulphide concentrate is within following limits: nickel – 0.5–10 %, copper – 0.5–10 %, iron – 5–35 %, sulfur – 5–30 %, sum of precious metals – not less than 30 g/t.

EFFECT: high extraction of non-ferrous and precious metals.

5 cl, 2 dwg, 8 tbl, 6 ex