PRODUCTION OF CONDUCTIVE CARBON BLACK FOR USE IN DEPOLARIZATION MASSES IN DRY BATTERIES

摘要

Conductive carbon black for use in depolarization masses in dry batteries is produced. To this end, an aqueous suspension of carbon black having an AS-number higher than 15 and being obtained by subjecting hydrocarbons, which are liquid at room temperature, to thermal conversion at 1200-2000.degree.C, under 1-80 atmospheres, and in the presence of oxygen or oxygen-containing gas and, if desired, steam, and water-scrubbing the resulting carbon black-containing reaction gas is intimately mixed at 5120.degree.C, under 1-20 atmospheres, in liquid phase and for 1-20 minutes with 0.5-10 g, per gram of carbon black, of vaporizable aliphatic or cycloaliphatic hydrocarbons, the resulting carbon black is separated from the liquid phase, heated and thereby freed from hydrocarbons and water, and the temperature is finally increased for 2-30 minutes to 1100-2200.degree.C.