ИСТИНА

FIELD: technology of carbon-graphite materials. SUBSTANCE: to natural graphite fuming HNO3 (mass ratio of HNO3 : graphite = (0.37-0.75):1) or a mixture consisting of 2-4 mas. p. p. fuming and 1 p. 58% HNO3 (mass ratio mixture : graphite = (0.75-2.2):1) is added. It is possible to add preliminary 0.025 mas. p. urea/1 mas. p. graphite. Evolved gases are removed continuously. Hydrolysis and washing out are carried out at water feeding by countercurrent method to compound that is incorporated in graphite. Stirring is carried out by pulsating method. Mass ratio water : compound to be incorporated in graphite = (5-7):1. Drying the oxidized graphite is carried out at 80 C and below. Expansion degree of oxidized graphite is 230-500. Invention can be used for production of cellular graphite and graphite foil. EFFECT: improved method of production, decreased consumption of acid and acid effluence. 3 cl, 1 tbl, 2 ex