Posted 28 Dec 2010 22:01
Siderite (FeCO3) is one kind of traditional mineral resources, usually white or yellow, weathering to brown or brown after dark. Pure siderite w (TFe) was 48.28%, w (FeO) was 62.07%. Our resources are very rich siderite, the current proven reserves of nearly 2.0 billion t, mainly in the western and southern regions. Because of low grade, high impurity content, burning and other factors, has not been effectively utilized. To ease the supply of iron ore resources in the domestic steel industry pressure to reduce dependence on foreign resources to strengthen resources in the blast furnace or siderite converter development and utilization of the production process, have important practical significance. Siderite calcined under different conditions, chemical changes occur is different. PSF roasting generally oxidizing atmosphere, the reaction is as follows: 2FeCO3 +1 / 2O2 = Fe2O3 + CO2 reaction products hematite. Carried out in the shaft furnace roasting siderite industrial test, the chemical reaction of oxidation of the atmosphere, and finally get a high grade hematite iron. Pellet furnace roasting by siderite, as siderite provide a reference for the development and utilization, the technology is feasible, the process is simple, large capacity. Shaft furnace roasting siderite, the temperature controlled at 1050 ?and above the level of compressive strength of a single lump ore can be controlled at 1050N / block or so, the drum index can be controlled at about 48%. Siderite after furnace roasting, can effectively improve the w (TFe), lower w (S), to improve its metallurgical properties, the average size and intensity decreased significantly. Under the blast furnace, converter technical requirements of lump ore, in addition to ore grade, the low intensity of roasted ore, the other indicators to meet their basic requirements. Therefore, screening out the grain size less than 10mm, the siderite ore can be directly used in the blast furnace, ore roasting furnace or converter in the medium used.