LAUSR

A mathematical model for the reduction of different shapes of carbon-containing pellet in a rotary hearth furnace was established. The influence of the pellet shape on its direct reduction process was analyzed, and finally, the pellets degree of metallization (DOM) and zinc removal rate (ZRR) results were obtained. Specific surface area (δ) was defined as the different shape pellets key characteristic parameter. The relationships between DOM, ZRR and reduction time ( t ), pellet shape are obtained. The results also show that different shape pellets initial temperature rises quickly at the pellet corner where there are larger curvatures. However, the inward thermal conduction is smaller, and Fe will be produced there first. Different shape pellets basically enter the reduction stage at about reduction time of 200 s. These results are available for reference in the design of pellets used in rotary hearth furnace.