Abstract
AbstractThe reduction of natural and pre‐oxidised ilmenite with carbon at temperatures between 1173 and 1473 K (900–1200°C) was studied. The reaction was carried out in the atmosphere produced by the gaseous reaction products and the degree of reduction was determined from the CO and CO2 contents of the product gas, as measured by chemical absorption and continuous infrared analysis. Solid reaction products were analysed chemically, by X‐ray diffraction and by magnetic balance. The reaction was found to consist of a fast first stage representing the reduction of ferric to ferrous iron, and a slower second stage in which ferrous iron was reduced to metallic iron. A change in reaction mechanism, leading to retention of iron in solid solution in the reaction product, was shown to be promoted by high temperatures and/or the presence of Mn and Mg solute impurities. The applicability of various reaction models to the experimental data is discussed.
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