METHOD OF PYROMETALLURGICAL PROCESSING OF OXIDE MATERIALS Russian patent published in 2017 - IPC C21B13/00 

FIELD: metallurgy.

SUBSTANCE: method involves feeding the charge consisting of feedstock being processed, fluxes and carbonaceous material into the melting zone of the two-zone bubble-tube furnace into pre-molten material and flux. The melt is transferred to a reducing zone, into which the carbonaceous material, oxygen-containing blast is supplied, discharge of molten products is carried out. In this case, the carbonaceous material and an oxygen-containing blast are supplied to the furnace smelting zone in amount that ensure combustion of carbon to form gases consisting of CO oxide and dioxide CO₂, H₂ and vapours H₂O, the ratio of gases is maintained within CO/CO₂ 0.01-0.5, and H₂/H₂O 0.01-0.4. The carbonaceous material, oxygen-containing raw material in amount ensuring reduction of oxides of extracted metals into metal phase and compensation of thermal costs are supplied to the reduction zone. The ratio of gases in the reduction zone is maintained within CO/CO₂ 0.2-1.5, and H₂/H₂O 0.1-0.9.

EFFECT: minimisation of flow rates of carbonaceous and oxygen-containing materials per unit of finished product and thereby increase of technical and economic efficiency of the process.

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