Iron ore pellets

Iron ore pellets Iron ore pellet is a type of agglomerated iron ore fines which has better tumbler index when compared with that of parent iron ore and can be used as a substitute of lump ore for the production of direct reduced iron (DRI) and in blast furnaces for the production of hot metal.┬áThe term iron ore pellets refers to the thermally agglomerated substance formed by heating a variable mixture of iron ore, limestone, olivine, bentonite, dolomite and miscellaneous iron bearing materials in the range of 1250 deg C to 1350 deg C. Iron ore pellets are normally produced in two types of grades namely DRI grade and BF grade. BF grade pellets have higher basicity than the DRI grade. The general identification details of iron ore pellets are given Tab 1. Tab 1 Identification details of Iron ore pellets Chemical name Iron ores, agglomerates Other names Iron ore pellets, iron oxide pellets CAS No. 65996-65-8 EINECS No. 265-996-3 Molecular formula Fe2O3 Molecular weight (gram/mole) 159.7 Synonyms Di iron trioxide Mineral of identical or similar composition Hematite Other identity code: Related CAS No. Hematite (Fe2O3) 1317-60-8 REACH (Registration, Evaluation, Authorization, and restriction of Chemicals) registration No. 01- 2119474335-36-0013 DRI pellets donot contain CaO while BF grade pellets are fluxing pellets containing CaO. For BF grade pellets reducibility and swelling index are important properties while for DRI grade disintegration is an important property. The properties of pallets are given in Tab 2. Tab 2 Properties of pellets Size 8-20 mm Appearance Granular Colour Dark grey Odour Odourless pH (40 gm/L,20Deg C; slurry in water) 5.0 – 8.0 Melting point 1500-1600 deg C Bulk density 2.0 -2.2 t/Cum Water solubility Insoluble Oil solubility Insoluble Tumbler index (+6.3 mm) 93-94 % Abrasion index (-0.5 mm) 5-6...