FIELD: treatment of solid materials with gas. SUBSTANCE: device includes screw conveyer through which circulating medium is blown; control of circulating medium is effected in one or several chambers having open side adjoining perforated sides of spiral conveyer. Additional control of circulating medium may be effected through discharge of gas from chambers. EFFECT: effective control of drying parameters and improved quality of finished product. 11 cl, 10 dwg
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