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Roasting of a raw mix both at dry, and at a wet way of manufacture is carried out basically in rotating furnaces. Mine furnaces apply sometimes only at a dry way of manufacture. Медицинское училище № 13 Rotating furnace represents long, located slightly naklonno the cylinder (drum) welded from a sheet steel with fire-resistant futerovkoj inside. Length of furnaces of 95-185-230 m, diameter of 5-7 m. In the USSR began to apply the rotating furnaces working on a dry way of manufacture, the size 7X95 m, productivity 3000 tsut, with the expense of heat on roasting 3400 kdzhkg. окна в 21 век пластиковые откосы At the enterprises with wet way of manufacture furnaces 7X230 m as productivity 3000 tsut work at the expense is warm 5600 kdzhkg. For improvement of heat exchange in furnaces is closer to the top (cold) end arrange chain veils, establish heat exchangers of a various design.
Rotating furnaces work by a countercurrent principle. The raw materials in the form of a powder (a dry way) or in a kind shlama (a wet way) move an automatic feeder in the furnace from outside its top (cold) end, and from outside the bottom (hot) end fuel (natural gas, black oil, an air-coal mix), burning down in the form of a torch throughout 20-30 m of length of the furnace is blown. Hot gases arrive towards to raw materials. raw materials occupy only a furnace part on cross-section section, and at its rotation with speed of 1% obmin slowly move by the bottom end, passing various temperature zones. The outstanding Soviet scientist V.N.Jung who has developed bases of the theory of roasting, has conditionally divided rotating furnace into six temperature zones depending on character of proceeding processes.
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