Methods
for the extraction of nickel matte from nickel sulfide
ores include flotation, magnetic separation, roasting,
and smelting. Raw nickel matte, comprising about 15%
nickel and copper sulfides, metallic nickel, and metallic
copper, 50% iron, and 25% sulfur, is processed to
remove oxidized iron sulfide, leaving nickel matte that
contains about 50% nickel