Ore Melting and Reduction in Silicomanganese Production |
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Authors: | Eli Ringdalen Sean Gaal Merete Tangstad Oleg Ostrovski |
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Affiliation: | (1) Materials and Chemistry, SINTEF, 7465 Trondheim, Norway;(2) Department of Materials Science and Engineering, NTNU, 7491 Trondheim, Norway;(3) School of Materials Science and Engineering, UNSW, 2052 Sydney, Australia; |
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Abstract: | The charge for silicomangansese production consists of manganese ore (often mixed with ferromanganese slag) dolomite or calcite,
quartz, and in some cases, other additions. These materials have different melting properties, which have a strong effect
on reduction and smelting reactions in the production of a silicomanganese alloy. This article discusses properties of Assman,
Gabonese, and Companhia Vale do Rio Doce (CVRD) ores, CVRD sinter and high-carbon ferromanganese (HC FeMn) slag, and their
change during silicomanganese production. The melting and reduction temperatures of these manganese sources were measured
in a carbon monoxide atmosphere, using the sessile drop method and a differential thermal analysis/thermogravimetric analysis.
Equilibrium phases were analyzed using FACTSage (CRCT, Montreal, Canada and GTT, Aachen, Germany) software. Experimental investigations
and an analysis of equilibrium phases revealed significant differences in the melting behavior and reduction of different
manganese sources. The difference in smelting of CVRD ore and CVRD sinter was attributed to a faster reduction of sinter by
the graphite substrate and carbon monoxide. The calculation of equilibrium phases in the reduction process of manganese ores
using FACTSage correctly reflects the trends in the production of manganese alloys. The temperature at which the manganese
oxide concentration in the slag was reduced below 10 wt pct can be assigned to the top of the coke bed in the silicomanganese
furnace. This temperature was in the range 1823 K to 1883 K (1550 °C to 1610 °C). |
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