Process for concentrating waste products arising during the manufacture of carbon electrodes

摘要

The solid, liquid and gaseous waste products which arise during the manufature of carbon electrodes are concentrated. First, the solid electrode waste is mixed with the carbon-rich dusts from crushing operations, and with lime or lime and gypsum (from a wet scrubbing operation). By means of grinding and screening the mixture is converted to a suitable range of fine particulate sizes, then fed continuously as adsorbent material through a dry scrubbing unit through which is passed the gaseous waste that also contains fractions of fluid waste. The thus charged adsorbent is combusted together with oily waste in a low temperature fluidized bed boiler. The resultant ash and slag which contain the pollutants as non-hazardous calcium sulfate or calcium fluoride are transported to a dumping site. The adsorbent for dry scrubbing units for purifying waste gases from units manufacturing carbon electrodes comprises fine-grained, ground electrode residue, carbon-rich dusts from crushing operations and lime or lime and gypsum.