Treatment of complex sulfide concentrate
AssigneeOutotec (Finland) Oy
InventorsMaija-Leena Metsärinta, Satu Jyrkönen, Jussi Liipo
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Abstract
A process of treating complex sulfide concentrate includes the steps of roasting wet or slurried complex sulfide concentrate in a furnace at a temperature of at least 720° C. to obtain a calcine; smelting the calcine under inert or oxygen free atmosphere in a smelting furnace to obtain a matte, and optionally granulating the matte to obtain a granulated matte.
Claims11
A process of treating complex sulfide concentrate, wherein the complex sulfide ore comprises 2 to 20 wt % Ni, 0 to 15 wt % Cu, and 10 to 55 wt % Fe of the total weight of the concentrate and the complex sulfide concentrate is obtained from complex sulfide ores comprising sulfides of two or more metals, comprising the steps of:
- (a) roasting wet or slurried complex sulfide concentrate in a furnace at a temperature from 720° C. to 870° C. to obtain a calcine, wherein oxygen is introduced into the roasting step (a) as oxygen enriched air, wherein the oxygen partial pressure is below 1000 Pa;
- and
- (b) smelting the calcine obtained in step (a) at a temperature from 1250° C. to 1500° C. under inert or oxygen free atmosphere in a smelting furnace to obtain a matte.
Dependencies are inferred from the claim text.