FIELD: recovery of fine-grained material. SUBSTANCE: method involves separating solid substance in solid substance separator, particularly in cyclone; returning solid substance into reactor by means of carrier gas while maintaining predetermined pressure difference in solid substance separator and solid substance return zone; continuously sucking out separated solid substance from solid substance separator by means of working gas and also with the help of injector, subjecting to acceleration, directing into reactor and supplying oxygen at reactor inlet end to partially gasify and/or burn it. Method allows returning of solid substance to be performed without employment of movable parts, which are commonly subjected to abrasive actions. EFFECT: increased efficiency and enhanced reliability in operation. 14 cl, 2 dwg
