Effects of reduction parameters on the amount of Pb, Zn, Cu and Cd in reduced pellets. a case study of Nizna Slana Iron ore pellets

Abstract

A study of reduction of Nizna Slana Iron ore pellets using Hydrogen has been conducted. The structural and phase changes that occur in iron ore pellets at various temperatures have been investigated by scanning electron microscopy. The pellets were made from concentrates of Nizna Slana iron ore obtained from Slovakia, and were reduced at various temperatures in the range 600oC to 1200oC. It was found that recrystallization of hematite and melting of the gangue minerals present started at about 1100oC. At about 1150oC, the amount of Pb, Zn, Cd and Cu in the pellets were significantly reduced. Compressive strength measurements also showed that the strength of pellets reduced at 900oC or less were low compared to those of pellets reduced at 1150oC. At 1150oC, the observed fracture mode was transcrystalline.



Keywords: Pellets, Temperature, Recrystallization.


[Global Jnl Engineering Res. Vol.2(1&2) 2003: 85-94]