PROCESSING METHOD OF PULP AFTER AUTOCLAVE-OXIDISING LEACHING OF SULPHIDE POLYMETALLIC MATERIALS, WHICH CONTAINS IRON OXIDES AND ELEMENTAL SULPHUR Russian patent published in 2015 - IPC C22B23/00 C22B3/04 C22B3/44 B03D1/00 

FIELD: metallurgy.

SUBSTANCE: method involves stage-by-stage deposition of sulphides of non-ferrous metals from a solution of oxidised pulp by metallic iron and a polysulphide-thiosulphate reagent at the temperature below the melting point of elemental sulphur and by continuous mixing with the next release of sulphides and elemental sulphur by floatation to a bulk sulphur sulphide concentrate. With that, deposition of sulphides of non-ferrous metals is performed in presence of an organic additive having an ability for selective heterocoagulation of sulphides and elemental sulphur, at weight ratio of the sulphur introduced with the polysulphide-thiosulphate reagent to the organic additive which is equal to 1:(0.0015-0.020). After the deposition stage of sulphides with the polysulphide-thiosulphate reagent, metallic iron is additionally added to the pulp.

EFFECT: reduction of iron consumption at simultaneous preservation of quality of a sulphur-sulphide concentrate and improvement of an extraction level to it of non-ferrous and precious metals.

5 cl, 1 tbl, 8 ex