Influence of CaO and Na₂CO₃ as Additive on the Reduction of Hematite-Lignite Mixed Pellets

Abstract

Iron oxide-lignite mixed pellets with minor addition of CaO and Na₂CO₃ were reduced isothermally at 900, 950 and 1000°C under constant flow rate of nitrogen gas. The variable parameters studied are the amount of carbon, reduction temperature and the amount of additive. The experiments were statistically planned in order to quantitatively assess the effect of each variable and the interactional effect of different variables.
It was found that under the nitrogen gas atmosphere, the amount of carbon, reduction temperature and the amount of Na₂CO₃ substantially influence the degree of reduction.