METHOD OF PRODUCTION OF OXIDIZED BLACK LEAD, A DEVICE FOR ITS REALIZATION AND ITS VERSION Russian patent published in 2005 - IPC

FIELD: atomic industry; chemical industry; metallurgy; heat-and-power engineering; production of the oxidized black lead.

SUBSTANCE: the invention may be used is pertaining to the methods of production of the oxidized black lead and may be used in atomic industry, chemical industry, metallurgy, heat-and-power engineering at production of heat-insulating and refractory materials, a flexible graphite foil, sorbents. Prepare a non-laminated, having electronic conductivity suspension of black lead in 70-98 % H₂SO₄. The suspension may be further added with H₃PO₄ or_{CH3COOH. The gained suspension is fed into to the reactor 1 of the hopper 12 through a branch-pipe 3 by means of a piston 13. In the reaction chamber 9 it is moved by gravity flow along the hollow perforated cathode 7 and gets in contact with the anode 5. The anodic oxidation of the black lead conduct without its prepressing to the anode in absence of a free electrolyte with production of the electrical power in amount of no less than 30 A·h/kg of black lead at a constant value of the electric current or at a constant anode potential. Excess of an acid passes through a separator made out of a filtering fabric 8 and enters in the internal cavity of the cathode 7, one end 11 of which is open and then - into a collector 17. The ionic bond between the cathode 7 and the anode 8 is conducted through the separator 8, preventing an occurrence of a possible short circuit. The ring-type design of the reaction chamber 9 ensures uniformity of treatment of the anode and the least hydraulic resistance. The oxidized black lead is discharged through a branch-pipe 4, hydrolyzed, flushed, filtered and dried. The invention allows to boost productivity and to produce a foam-graphite after its frothing at the temperature of 900°C with a high degree uniformity and a bulk density of 1.5-3.2 g/l.}

EFFECT: the invention ensures an increased productivity and production of a foam-graphite with a high degree uniformity and a good bulk density.

22 cl, 4 dwg, 2 tbl, 2 ex