FIELD: ferrous and nonferrous metallurgy, chemical, food-processing and construction industries. SUBSTANCE: shaft kiln includes preheating, roasting and cooling zones. Base of roasting zone has narrowed profile in which fuel combustion chambers are built. Combustion chambers are interconnected by circular passage provided with holes connecting the combustion chambers with working chamber of kiln in lower narrowed portion of profile. EFFECT: increased capacity of kiln and improved quality of finished product due to smooth distribution of gas flow over entire section of kiln. 2 cl, 1 dwg
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