Process of conductive carbon black for use in depolarization masses in dry batteries

A process for making conductive carbon black for use in depolarization masses in dry batteries, which comprises intimately mixing an aqueous suspension of carbon black having an AS-number higher than 15 and having been obtained by subjecting hydrocarbons, which are liquid at room temperature, to thermal conversion at temperatures of 1200.degree. up to 2000.degree. C, under pressures of 1 up to 80 atmospheres, and in the presence of oxygen or oxygen-containing gases, and water-scrubbing the resulting carbon black-containing reaction gas, with 0.5 up to 10 g, per gram of carbon black, of vaporizable aliphatic or cycloaliphatic hydrocarbons having a boiling range of 25.degree. up to 100.degree. C, the mixing operation being effected at temperatures of 5.degree. up to 120.degree. C, under pressures of 1 up to 20 atmospheres, in liquid phase, and for a period of 1 up to 20 minutes, separating the resulting carbon black from the liquid phase, heating and thereby freeing the carbon black from hydrocarbons and water, and increasing the temperature over a period of 2 up to 30 minutes to 1100.degree. up to 2200.degree. C.