FIELD: metallurgy. SUBSTANCE: gear incorporates three-tube structure including internal tube to feed gas carrying oxygen having inlet section and fitted with conduit feeding gas carrying oxygen, intermediate tube to feed particles into gas carrier arranged around internal tube that includes inlet section for particles and feeding conduit and external tube to feed gas carrying oxygen arranged around intermediate tube and including inlet section and feeding conduit. Front ends of internal tube feeding gas carrying oxygen, of intermediate tube feeding particles and of external tube feeding gas carrying oxygen form nozzle that is used to inject small particles fed through feeding tube and subject to roasting and melting together with stream of air and/or oxygen supplied correspondingly through internal and external tubes. Gas carrying oxygen is fed by two flows through central and external circular conduits with velocity equal to 15.0 m/s as minimum. Small particles are injected through intermediate conduit with feed of gas carrier with velocity equal to 10.0 m/s as minimum. Ratio of total amount of oxygen fed over internal and external conduits of gear to total content of carbon in mixture of particles is kept as 0.6 at least and amount of oxygen fed over internal conduit amounts to not more than 20% of total amount of oxygen. Small particles contain not less than 30% of solid carbon and have size not exceeding 0.5 mm. Amount of gas carrier by which small particles are injected is kept equal to 0.05-0.5 kg per 1.0 kg of injected particles and preferably 0.05-0.2 kg per 1.0 kg of particles. Molar ratio of total amount of oxygen to total content of carbon in particles is maintained equal 0.7-0.8. EFFECT: provision for possibility of even roasting and melting of particles over entire zone of burning flame. 9 cl, 5 dwg
