The Sintering Process of Iron Ore Fines Mar09

The Sintering Process of Iron Ore Fines...

                   The Sintering Process of Iron Ore Fines  Sintering plants are normally associated with the production of hot metal in blast furnaces in integrated steel pants.  The process of sintering is basically a pre-treatment process step during iron making to produce charge material called sinter for the blast furnace from iron ore fines and also from metallurgical wastes (collected dusts, sludge and mill scale etc.). The sintering technology was originally developed for the purpose of using the iron the metallurgical waste of a steel plant and iron ore fines in the blast furnace. But currently the focus has changed. Now the sintering process aims to produce a high quality burden for the blast furnace. Today sinter is the main metallic burden for a large blast furnace.  The Principle of sintering  The principle of sintering involves the heating of iron ore fines along with flux and coke fines or coal to produce a semi-molten mass that solidifies into porous pieces of sinter with the size and strength characteristics necessary for feeding into the blast furnace. It is basically an agglomeration process achieved through combustion. The Product Sinter The product of the sintering process is called sinter and is having good following quality characteristics Chemical analysis Grain size distribution Reducibility Sinter strength Typical properties of sinter are given in Tab 1   Tab 1  Typical properties of sinter Item Unit Value Fe % 56.5 to 57.5 Feo % 6.0-8.0 SiO2 % 4.0 to 5.0 Al2O3 % 1.8 to 2.5 CaO % 7.5 to 8.5 MgO % 1.6 to 2.0 Basicity (CaO/SiO2) 1.7 to 2.9 ISO Strength  (+6.3mm) % >75 RDI (-3 mm) % 27-31 The product sinter is shown in Fig. 1.  Fig 1   Sinter Advantages of adding flux to sinter Sinters are classified into...