FIELD: purification of chemicals using crystallization methods. SUBSTANCE: melt is first given form of crystallized pellets and a partial fusion of the pellets is produced in a hot gas flow, while final product is withdrawn transversely to direction of draining of partially fused pellets. Arrangement consists of crystallizer and means for partial fusion having form of a tank including perforated oblique barrier, which receives pellets leaving crystallizer. Upper part of tank accommodates a heater. EFFECT: improved purification procedure. 5 cl, 2 dwg
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