13 kinds of iron ores （6 from Australia and 7 from Brazil） were studied on their properties concerning CW （Combined Water） decomposition, FezO3 decomposition and softening-melting in air atmosphere through the cha...13 kinds of iron ores （6 from Australia and 7 from Brazil） were studied on their properties concerning CW （Combined Water） decomposition, FezO3 decomposition and softening-melting in air atmosphere through the characterization method of TG-DSC （Thermogravimetry-Differential Scanning Caloremetry ）. The experimental results of the Australian ores and Brazilian ores differ in terms of the initial temperature, temperature range and endothermic amount of CW decomposition,and besides, the content of CW. It is estimated that for every percent increase of CW content in sintering raw material, the extra thermal amount absorbed in the process is about 1.83 x 104 kJ, which equals to the thermal capacity of 0.625 kg of standard coal burning up completely. As to the decomposition of Fe203 ,the initial temperatures, terminal temperatures and temperature ranges of the Australian and Brazilian ores are quite close. However, the endothermic amount of Fe2O3 decomposition of the two turns out rather different： the endothermic capacity of Fe2O3 decomposition of the Australian ores is greater than that of the Brazilian ores. Furthermore, the liquid amount generated in the softening-melting process is closely related to the SiO2 content in iron ore. The higher SiO2 content the ore contains, the more liquid volume it will generate in the softening-melting process of iron ore.展开更多
文摘13 kinds of iron ores （6 from Australia and 7 from Brazil） were studied on their properties concerning CW （Combined Water） decomposition, FezO3 decomposition and softening-melting in air atmosphere through the characterization method of TG-DSC （Thermogravimetry-Differential Scanning Caloremetry ）. The experimental results of the Australian ores and Brazilian ores differ in terms of the initial temperature, temperature range and endothermic amount of CW decomposition,and besides, the content of CW. It is estimated that for every percent increase of CW content in sintering raw material, the extra thermal amount absorbed in the process is about 1.83 x 104 kJ, which equals to the thermal capacity of 0.625 kg of standard coal burning up completely. As to the decomposition of Fe203 ,the initial temperatures, terminal temperatures and temperature ranges of the Australian and Brazilian ores are quite close. However, the endothermic amount of Fe2O3 decomposition of the two turns out rather different： the endothermic capacity of Fe2O3 decomposition of the Australian ores is greater than that of the Brazilian ores. Furthermore, the liquid amount generated in the softening-melting process is closely related to the SiO2 content in iron ore. The higher SiO2 content the ore contains, the more liquid volume it will generate in the softening-melting process of iron ore.
