METHOD FOR PYROMETALLURGICAL PROCESSING OF OXIDIZED NICKEL ORE Russian patent published in 2017 - IPC C22B23/00 C21B13/00 C22C33/04 

FIELD: metallurgy.

SUBSTANCE: method involves charging oxidized nickel ore together with fluxing additives and carbonaceous material, taken in amount of 1.0-1.1 of stoichiometric amount required for partial metallisation of nickel and reduction of iron to bivalent state into the metallization furnace, heating the charge to the temperature 50° C lower than the temperature of its softening beginning due to the gases heat generated in waste heat boiler, feeding the heated charge to a three-zone furnace where melting of metallized charge takes place in the melting zone due to the heat comes from combustion of natural gas in oxygen with oxidant consumption factor α=0.8-0.9. Obtained melt is fed into bubbling zone for treatment by purging through tuyeres of gas-reducer heated by plasma to temperature ensuring melt temperature of 1500-1600°C and chemical composition, corresponding to the composition of the combustion products of natural gas in oxygen with the ratio of oxidant flow rate α=0.5-0.6, with separation of obtained ferronickel and slag, then the slag melt is reduced by carbonaceous reducing agent in production zone of metal-semi-product by melting in liquid bath, in this case, afterburning of the exhaust gases of the bubbling zone and the production zone of the metal semi-product is carried out in the melting zone, and cooling them to temperatures required in metallisation furnace, in waste-heat boiler.

EFFECT: invention makes it possible to produce ferro-nickel containing more than 70 percent of nickel and a metal semi-product for the production of steel.

3 cl, 2 dwg