FIELD: production of flexible foil and sorbents.
SUBSTANCE: graphite particles and 20-58-% aqueous solution of nitric acid are introduced into electrolyzer and electrochemical treatment of particles is performed at one or more stages at constant anode potential at delivery of electricity no less than 50 mA.h/g of graphite. Preliminary stage of electrochemical treatment may be performed at potential of 2.1 to 2.5 V 10-600 s and main stage may be performed at potential 1.5 to 1.8 V 3-7 h. Product thus treated is washed with water, dried and is subjected to heat treatment. Cellular graphite thus obtained is characterized by homogeneous structure at bulk density of 1.0-5.0 g/l and foaming temperature of 150-900 C.
EFFECT: facilitated procedure; reduced time of treatment; reduced power requirements.
8 cl, 1 tbl, 13 ex
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