THERMODYNAMIC STUDY OF SOLID-PHASE REDUCTION OF POLYGRADIENT IRON-CONTAINING MATERIAL
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2022-01-01
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Abstract
The studied iron ore material is a polygradient with increased content of manganese, barium, and lead. The thermodynamics of the reduction of this pelletized material, using the Electromotive force (EMF) method, has been investigated. Coke breeze and brown coal/lignite were used as reducing agents. The solid reducer was added in two ways - into the charge for the production of raw pellets and in the layer of the pellets and reducer, i.e. outside the pellets. The effects of pellets reduction and the ongoing temperature-dependent reduction processes were performed experimentally. Based on the experimental data, the equations Δ = f(T) of the studied pellets were derived. The stages of pallets heating, when the main solid-phase interactions and the possible reduction processes take place, were described. It was found out that, in the temperature range 933 K - 1213 K, the reduction of hematite to magnetite takes place as a priority. The barium and lead oxide are completely reduced. The macrostructure and phase changes were observed metallographically. The results showed that when adding the reducer into the composition of the pellets, up to 90 % degree of metallization was reached.