Study on kinetics of thermal decomposition of low LOI goethetic hematite iron ore

Beuria P.C.; Biswal S.K.; Mishra B.K.; Roy G.G.

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Study on kinetics of thermal decomposition of low LOI goethetic hematite iron ore

机译：低LOI针铁矿赤铁矿热分解动力学研究

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In the present study, the kinetics of thermal decomposition of hydrated minerals associated in natural hematite iron ores has been investigated in a fixed bed system using isothermal methods of kinetic analysis. Hydrated minerals in these hematite iron ores are kaolinite, gibbsite and goethite, which contribute to the loss on ignition (LOI) during thermal decomposition. Experiments in fixed bed have been carried out at variable bed depth (16, 32, 48 and 64 mm), temperature (400-1200 _C) and residence time (30, 45, 60 and 75 min) for iron ore samples. It is observed that beyond a certain critical bed depth (16 mm), 100% removal of LOI is not found possible even at higher temperature and higher residence time. Most of the solid-state reactions of isothermal kinetic analysis have been used to analyze the reaction mechanism. The raw data are modified to yield fraction reacted ''''''''a” versus time and used for developing various forms of ''''''''a” functions. f(a) is the inverse of first derivative of g(a) with respect to a. The study demonstrates that decomposition of hydrated mineral in hematite follows the chemical kinetics.The estimated activation energy values in all the experimental situations are found to high, of the order of 60 kJ/mol, reinstating that the reactions are indeed controlled by moving phase boundary and random nucleation.

机译：在本研究中，已使用等温动力学分析方法在固定床系统中研究了天然赤铁矿铁矿石中伴生的水合矿物热分解的动力学。这些赤铁矿铁矿石中的水合矿物是高岭石，菱铁矿和针铁矿，它们在热分解过程中会引起灼烧损失（LOI）。对于铁矿石样品，已在可变床深（16、32、48和64 mm），温度（400-1200℃）和停留时间（30、45、60和75分钟）下进行了固定床实验。据观察，超过一定的临界床深度（16毫米），即使在更高的温度和更长的停留时间下，也无法100％去除LOI。等温动力学分析的大多数固态反应已用于分析反应机理。修改原始数据以生成反应的''''''''a''随时间变化的分数，并用于开发各种形式的''''''a''函数。 f（a）是g（a）的一阶导数相对于a的逆。研究表明，赤铁矿中水合矿物的分解遵循化学动力学。在所有实验情况下，估计的活化能值都很高，约为60 kJ / mol，这表明反应确实受移动相边界的控制和随机成核。

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《矿业科学技术学报：英文版》 |2017年第006期|P.1031-1036|共6页
作者
Beuria P.C.; Biswal S.K.; Mishra B.K.; Roy G.G.;
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作者单位

[1]Mineral Processing Department, CSIR – Institute of Minerals and Materials Technology, Bhubaneswar 751013, India;

[1]Mineral Processing Department, CSIR – Institute of Minerals and Materials Technology, Bhubaneswar 751013, India;

[1]Mineral Processing Department, CSIR – Institute of Minerals and Materials Technology, Bhubaneswar 751013, India;

[2]Indian Institute of Technology, Kharagpur 721302, India;

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 CHI
中图分类矿业工程;
关键词
Loss on ignition; Goethite; Kaolinite; Gibbsite; Roasting; Pellet feed; Kinetic analysis;

机译：灼烧损失;针铁矿;高岭石;菱铁矿;焙烧;颗粒饲料;动力学分析;

Study on kinetics of thermal decomposition of low LOI goethetic hematite iron ore

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