Optimum Slag–Alloy Relationships for the Production of Medium- To Low-Carbon Ferromanganese

Abstract Optimum slag-alloy relationships in the production of medium- to low-carbon ferromanganese were studied from data gathered at the Transalloys plant in South Africa and from laboratory-scale tests. A critical basicity ratio was defined for the final slag above which problems would be likely in the separation of the slag from the alloy. The initial melt and alloy compositions and the melt-toalloy ratios have to be carefully controlled if the alloy produced is to meet the silicon specification and at the same time contain a reasonable proportion of manganese. The recovery of manganese at the required silicon specification in the alloy can be improved by multistage contacting. Resume A partir des donnees rassemblees a l'usine Transalloys en Afrique du Sud et d'experiences en laboratoire, nous avons etudie les relations optimales scorie-alliages dans la production de ferromanganese de moyen a bas carbone. On a defini, pour la scorie finale, un rapport de basicite critique au dele duquel des problemes ...