Siberian Federal University

The possibility of reducing the chemical losses of alkali during the reduction of nickel directly from the sulfide compounds that form part of the nickel concentrate of converter matte separation is considered. It was proved that at temperatures of 350–700 °C the disproportionation of elemental sulfur in an alkaline medium is accompanied by the associationof sulfide and elemental sulfur to give the compound Na2Sn, (where n = 1 ÷ 4). Titrimetric, gravimetric, x-ray spectral and x-ray phase analysis methods were used for the work