STRENGTHENING THE SINTERING OF IRON CONCENTRATE FINES BY HIGH PRESSURE ROLLER GRINDING PRETREATMENT

摘要

The influence of high pressure roller grinding (HPRG) on sintering of iron concentrate fines was investigated. Results of mini-sintering tests showed that assimilation temperature of iron concentrate fines decreased from 1230 °C to 1220 °C and assimilation time was shortened from 10 min to 5 min when the iron concentrate fines was pretreated by HPRG. Sinter pot tests showed that the yield of sinter increased from 60.33% to 72.92% , tumble index increased from 44.35% to 46.66%. The investigation indicated that, after being pretreated by HPRG, iron concentrate fines are improved in ballability and the fraction of fine particles increased, resulting in the improvement of granulation property and reactiveness in solid state reaction. As a result, sintering of iron concentrate fines were strengthened.