2018 Volume 58 Issue 11 Pages 1989-1998
Coke-ore mixed charging is a well-known and effective measure to strengthen BF operation and realize low reducing agent BF ironmaking. The objective of this paper is to investigate the effect of coke-ore mixing ratio on softening-melting dropping performance and permeability of vanadium-titanium mixed burden and to clarify the interaction mechanism between mixed nut coke and iron-bearing burden under BF simulating conditions. It was found that the softening-melting-dropping behaviors and permeability of mixed burden get improved obviously with a coke-ore mixing ratio of 20%. However, the generation of carbide of V and Ti would be accelerated with further increasing coke-ore mixing ratio to 50%, which would deteriorate the fluidity of slag and worsen the dropping behavior of mixed burden and lower the yield of V in liquid iron. The interaction between nut coke and vanadium-titanium mixed burden could be summarized as four parts, namely reduction strengthen, carburization promotion, permeability improvement, and the precipitation of the carbide of titanium.
