印度奥里萨邦和恰蒂斯加尔邦天然铁矿石的化学、物理、热、结构和矿物学研究

摘要

研究了印度奥里萨邦和恰蒂斯加尔邦不同地区铁矿石的化学、物理、热性能和结构特性,了解了Fe、Al2O3、SiO2、S和P的组成变化,分析了其敏感性,以满足各种铁制造工业技术要求.化学分析结果表明,大部分铁矿石中赤铁矿含量丰富(>90 wt％),矸石含量低(<4.09 wt％SiO2,<3.8 wt％Al2O3),所有铁矿中有害元素含量低(P<0.065 wt％,S<0.016 wt％).XRD衍射表明矸石以高岭石和石英的形式存在,其傅里叶变换红外光谱(FTIR)在914～1034 cm–1范围内.该铁矿具有优良的物理性能,例如转塔指数(82 wt％～91 wt％)、磨损指数(1.27 wt％～4.87 wt％)和破碎指数(0.87 wt％～1.64 wt％).采用红外光谱和热分析方法对样品进行同化差值分析.研究表明,这些铁矿石具有三个吸热反应,即低于447 K的脱水反应,质量损失为0.13 wt％～1.7 wt％,525～609 K的脱羟基反应,质量损失为1.09 wt％～4.49 wt％,597～850 K的铝硅酸盐分解,质量损失为0.13 wt％～1.15 wt％.这些铁矿具有优良的物理化学特性,适合高炉和DRI作业.%The chemical, physical, thermal and texture properties of iron ores from different regions of Odisha and Chhattisgarh regions, India, have been investigated to understand the compositional variations of Fe, Al2O3, SiO2, S and P. They were analyzed for its susceptibility to meet the industrial requirements, for various iron manufacture techniques. Chemical analysis indicated that the majority of the iron ores is rich in hematite (> 90 wt％), poor in gangue (<4.09 wt％SiO2 and <3.8 wt％ Al2O3) and deleterious elements (P<0.065 wt％ and S<0.016 wt％) in all these iron ores found to be low. XRD peaks reviled that the gangue is in the form of kaolinite and quartz, and same was observed in Fourier transform infrared (FTIR) spectroscopy in the range of 914 to 1034 cm–1. The iron ores were found to have excellent physical properties exemplify with tumbler index (82 wt％–91 wt％), abrasion index (1.27wt％–4.87 wt％) and shatter index (0.87wt％–1.64 wt％). FTIR and thermal analysis were performed to assimilate the analysis interpolations. It was found that these iron ores exhibit three endothermic reactions, which are dehydration below 447 K with mass loss of 0.13 wt％ to 1.7 wt％, dehydroxylation at 525–609 K with mass loss of 1.09 wt％–4.49 wt％ and decomposition of aluminosilicates at 597–850 K with mass loss of 0.13 wt％–1.15 wt％. From this study, we can conclude that due to its excellent physico-chemical characteristics, these iron ores are suitable for BF and DRI operations.