Characterization of Preparing Cold Bonded Carbon Bearing Pellets of Metallurgical Dust for Direct Reduction

Abstract

This paper involves the preparation of cold bonded carbon bearing pellets of metallurgical dust for direct reduction using binder. Investigation reveals that the binder is of vital concern to the preparation of cold bonded carbon bearing pellets. For agglomeration these metallurgical dust, quick lime displays excellent adhesive ability. The strength of pellets with addition 10% quick lime and mixing 9% moisture content after 2 h dried are about 700 N and over 20 times respectively, which is enough to charge the composite pellets into rotary hearth furnace or rotary kiln. In cold bonding, the (3, 3) simplex lattice method was used to find a blend of binders that would result in optimum mechanical properties. Pellets were made up by composite binders, in which quick lime content within the range from 5 to 10%, bentonite content within the range from 0 to 2% and X from 0 to 0.7% possessing the CSP and DSP higher than 300 N, 11 times respectively, from the models of the mechanical properties.