FIELD: building materials production. SUBSTANCE: 1 - 15 mm size grains of mixture of initial material and 70 - 90 % fuel are dried and enter crossflow shaft heater to be roasted for 6 - 20 min. in filtering bed at 1150 - 1350 C. Then the grains are unloaded and brought to electric kiln with 1450 C temperature. Dust carrying out decreased to 0.05 - 0.1 %, exhaust gas temperature is 100 C. EFFECT: higher efficiency. 1 tbl
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