Influences of carbonaceous materials on the quality of hematite ore pellets

Abstract

Pellet in duration at high temperature for its hardening is an energy intensive process. Especially, for hematite ore pellet a very high in duration temperature (say 1325oC) is required to obtain the sufficient strength due to the absence of exothermic heat unlike magnetite ore. Therefore, in order to reduce the external energy requirement carbonaceous materials are added to supply in-situ energy on in duration. In the present study, different carbonaceous materials viz. Jhama coal, blast furnace flue dust, and coke powder have been added in pelletization of hematite ore fines to reduce the external energy requirement and to utilize the waste carbonaceous materials. It has been observed that green pellets’ properties are within acceptable limits which are not affected by the presence of the carbonaceous material. The cold compressive strength (CCS) of pellets increases with increasing in duration temperature. The furnace-cooled pellets show more strength than air-cooling. Blast Furnace flue dust added pellets show highest CCS among other carbonaceous material added in pellets which is 2515 N /pellet at 1280◦C. RI and RDI has also been influenced by the addition of other carbonaceous materials.