hermettc sealing is simplified and the conditions for mixing solid products are improved. At the same time, rotary furnaces remain the fundamental apparatuses for drying and calcining ores and concentrates.The authors correctly point out that the development of new processes and apparatuses is aimed at utilization of moving media, an elevated temperature, and automation. Examples are given of calculations for manytypes of apparatus employing fluidized and vibrofluidized beds, a spray dryer, and flame andplasma reactors.

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