Optimization of the Process Variables for Making Direct Reduced Iron by Microwave Heating using Response Surface Methodology

摘要

To optimize the process variables for making direct reduced iron (DRI) by microwave heating, the reduction temperature, reduction time and the ratio of coal to material were studied with the central composite design (CCD) and their interactions on the Metallization rate were also investigated. The predictive polynomial quadratic equations model was analyzed by ANOVA. Optimal conditions of making DRI can be concluded as follows: 28 min at 1139℃, the ratio of coal to material is 20.95%. Under these conditions, the metallization rate is up to 97.06%.