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In order to optimise the composition of slags for the after-treatment of steel, research was carried out on the dephosphorisation and desulphurisation of pure molten iron and molten steel. The tests consisted of equilibrium tests with lime-saturated slags and unsaturated phosphorus slags as well as kinetic tests involving soda slags. For the purposes of testing the dephosphorization processes, including the soda slags, in inductively agitated fusions, the slag mixtures were initially deposited or injected with a plunger lance. It was possible to adjust final phosphorus concentration levels that were just as low as in the equilibrium tests. By comparison with a single deposit of slag, the principal advantage of the injection technique lay in its more effective utilization of the slag. The second subject area involving the determination of thermodynamic data on foundry returns was characterized by two underlying features: environmental pollution and recycling. Assessments of Fe-O-X systems were carried out with special emphasis on Fe-O-Zn and Fe-O-Cd. One of the findings that can be inferred from the research, i.e. the formation of stable mixed crystals by small Cd concentrations in combination with iron oxide under oxidizing conditions, has important implications for technical systems.

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Authors: VEREIN DEUTSCHER EISENHUTTENLEUTE, Verein Deutscher Eisenhuttenleute, Dusseldorf (DE)
Bibliographic Reference: EUR 11614 DE (1988) MF, 230 pp., ECU 12, blow-up copy ECU 28.75
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