Treatment of zinc rich steel mill dusts for reuse in steel making processes

Abstract

Abstract Crush-resistant, metallized agglomerates, containing substantially no zinc or lead and capable of being charged to various steel-making furnaces, are produced from dust recovered from the fumes of a basic oxygen or open hearth steel-making furnace by forming a moistened mixture of (a) the dust (b) finely divided solid carbonaceous material containing sufficient carbon to make the total equivalent fixed carbon content of the mixture about 5 to about 25 weight percent, based on the dry weight of the mixture, (e) a bonding agent in the range of about 5 to about 25 weight percent, based on the dry weight of the mixture, and (d) one or more additional strengthening agents in minor amounts; forming the resultant mixture into green agglomerates; hydrothermally hardening partially dried or dried agglomerates at a temperature substantially below the combustion or decomposition temperature of the carbonaceous material; and then heating the hardened agglomerates at an elevated temperature for a sufficient time to reduce the iron oxide to metallic iron and to reduce and volatilize the zinc, lead and other reducible impurities therein.

Inventors

• 👤 M Goksel

Bibliographic Details