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Formation and effects of slag foaming in smelting reduction
Author(s) -
Gudenau Heinrich Wilhelm,
Wu Keng,
Nys Stefan,
Rosenbaum Heinz
Publication year - 1992
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199201753
Subject(s) - slag (welding) , smelting , foaming agent , materials science , metallurgy , reduction (mathematics) , composite material , porosity , geometry , mathematics
Research was carried out on the foaming phenomenon in the bath of the smelting reduction process with a hydrodynamic model and with high‐temperature experiments. There are two mechanisms of slag foaming: when foam is generated by injected gas, the height of the slag foaming can be regulated. Contrarily, the production of gas during the reduction of iron oxides causes slag foaming which can hardly be controlled. High temperature as well as low slag basicity reduce the foam stability. In smelting reduction a large slag volume is expected. A rinse‐spot in the slag layer, which can prevent slag foaming, disappears under these conditions. Wall‐effects play an important role for the foam stability.