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Development work at Hoesch AG was aimed at reducing or replacing the ore in ore/lime mixtures with LD-slag or LD-dust to recycle metallurgical waste and reduce costs for treatment additions. Findings were, inter alia: 1. that LD-slag without ore addition is not really suitable for the predesiliconisation of pig iron; 2. that LD-slag is satisfactory for the predephosphorisation of pig iron; 3. that the dephosphorising effect of sintered LD-sludge is almost the same as that of ore. The charging costs are clearly decreased for coarse grain size if LD-slag is used. In the 2nd part of the development work relating to phosphorus contents, the following basic measures for achieving the lowest [P] - contents were established: 1. Adjustment of a lime/lime silicate-saturated slag with about 10% SiO(2) and the lowest possible level of P(2)O(5); 2. Acceleration of reactions between slag and iron smelt by stirring with inert gas and reducing the slag viscosity. With regard to dephosphorisation to extremely low levels in the converter, a predesiliconisation of pig iron with an average [P] content does not appear to be useful.

Additional information

Authors: SCHEEL R, Hoesch Stahl AG, Postfach 10 50 42, D-4600 Dortmund 1 (DE)
Bibliographic Reference: EUR 12116 DE (1989) MF, 144 pp., ECU 8, blow-up copy ECU 18.75
Availability: (2)
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