FIELD: nonferrous metallurgy. SUBSTANCE: unit contains locking arm, flange tube, and bottom pipe of reduction apparatus retort. According to invention, unit is provided with ring disposed between tube flange and bottom pipe which is welded to flange. Diameter of ring is equal to diameter of bottom pipe, ratio of flange and ring diameters is 1:(1.0-1.2), and that of ring height to bottom pipe height is 1:(1.7-3.3). EFFECT: improved design. 3 cl, 1 dwg
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