What is the compsition of pellet which is used blast furnace iron making ?
I think you are referring to taconite pellets http://www.google.com/search?q=taconite+… and this article http://www.dnr.state.mn.us/education/geo… makes clear that by using magnets the iron oxide is extracted from the non-magnetic rock dust and compressed into pellets for shipment to the much more energy intensive removal of the oxygen from the iron.
I think you are asking about sinter pellets.In modern blast furnace practise the minerals(iron compounds)are separated from the crude ore and then crushed .Later, crushed minerals from several sources are mixed so that the blast furnace always has feed pellets(called sinter) of constant composition.The mixed mineral is then mixed with a few percent of fuel(usually crushed coke) and maybe a fluxing mineral and sintered.The sinter plant is like a very large pan with small holes in the base below which is a large suction pump and above which is a flame hood(think gas grill).the sinter mix is poured into the pan to a depth of about 30 cm and then the flame hood is moved over the top and the suction chamber is evacuated;after a while the fuel in the sinter mix ignites and the burning zone is drawn down through the bed(you can probably liken this to the burning zone being drawn through a cigarette)the result is a dense cake of porous mineral with the appearance of,but denser than,coke.The si
