Analysis of technical and economic indicators of the pyrometallurgical scheme co-processing of red mud and scale

Abstract

Elaboration and implementation of effective technologies of utilization of alumina production wastes (red mud) is a rather actual task. Various variants of red mud and oiled rolling scale agglomeration considered aimed at their utilization at sinter and blast furnace plants to obtain conditional marketable cast iron. As the object of the study, red mud of OJSC RUSAL and oiled rolling scale of Sinarsky pipe manufacturing plant were used. It was shown, that their joint processing enables to obtain an agglomerated product having iron content more than 50%, which meets the modern requirements to the burden materials for blast furnaces. To determine the optimal scheme of the processing in the blast furnaces, various variants of studied materials agglomeration were calculated – an oxidizing roasting to obtain pellets and briquetting with application of burnt lime as a binder. The components interrelation in the mixture was selected to have iron content in the agglomerated product high enough at maximal possible volume of red mud utilization. The calculation analysis showed that interrelation 50% of red mud and 50% of oiled rolling scale meet the requirement. Calculated blast furnace heat indicators presented while applying briquettes and pellets from red mud and oiled rolling scale in the burden.