Process for concentrating waste products arising during the...

Details Process for concentrating waste products arising during the... Process for concentrating waste products arising during the...

B - Operations, Transporting

09

B

252/26, 183/34

B09B 3/00 (2006.01) B01J 20/20 (2006.01) F23G 5/02 (2006.01) F23G 5/30 (2006.01)

Patent

CA 1261812

ABSTRACT The solid, liquid and gaseous waste products which arise during the manufacture of carbon electrodes are concent- rated; 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 con- tinuously 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 adsor- bent is combusted together with oily waste in a low temperature fluidised 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; in this way the waste products and fumes arising during production of carbon electrodes are concentrated economically and without disadvantage to the quality and constancy of the product; 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.

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