Apparatus and method for recovering carbon black from pyrolysis byproducts

摘要

A system ( 10 ), process and apparatus are disclosed for purifying carbon black ( 15 ) containing sulfur and metal oxide impurities by digesting ( 20 ) the impure carbon black in an acid to extract the metal oxide ( 25 ). Sulfur ( 45 ) is then removed from the acid treated carbon black ( 30 ) by solvent extraction ( 35 ) with an organic aromatic solvent which is then recovered ( 50 ). The purified carbon black ( 40 ) is then suitable for use as a toner ( 60 ) by toner black processing ( 55 ).