Induration aspects of low-grade ilmenite pellets: Optimization of oxidation parameters and characterization for direct reduction application

Nayak, Deepak; Ray, Nigamananda; Dash, Nilima; Rath, Swagat S.; Pati, Soobhankar; De, Partha Sarathi

doi:10.1016/j.powtec.2020.11.018

Cited by 35 publications

(6 citation statements)

References 27 publications

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“…And boundary conditions of the second and first order (3) where T(x,τ) is the pellet temperature depending on the pellet radius coordinate (x) and time (τ). Solution of the presented system of equations was realized via passing by subtended finite-difference scheme.…”

Section: Simulation Of Thermal Decarbonization Of Iron Ore Pelletsmentioning

confidence: 99%

“…Lack of information about decarbonization kinetics of iron ore raw material as well as about the effect of chemical and mineralogical composition, material structure and heating rate on calcination process don't allow to use the existing literature data on the results of thermal analytical researches of separate types of iron ore raw material and "clean" carbonate materials for description of calcination process of iron ore raw material [1][2][3]. Thereby, experimental investigation of the processes of carbonates dissociation with use of samples saving their initial material structure within the temperature range close to practical range is required for establishing the general regularities of calcination chemicalmetallurgical process [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Features of research of iron ore thermal decarbonization kinetics during roasting

I.¹,

Бобков²,

Kulyasov³

et al. 2021

cisisr

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The work is devoted to research of chemical-metallurgical decarbonization process in iron ore pellets, taking into account thermal and technological operation features of roasting conveyor-type machines. Calcination of pelletized iron ore raw material was experimentally examined, using the samples that save their initial structure within the temperature and heating rate ranges of the existing roasting conveyor-type machines. Appearance of essential temperature gradients in the examined samples was proved experimentally; it was connected with non-stationary heating conditions and thermal effects of carbonates dissociation reaction. These conditions and effects restrict possibility of use of the existing non-isothermal kinetic methods for determination of kind and parameters of kinetic equations. The relationship among heterogeneous endothermic transformations and thermal physical calcination conditions was revealed.

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Section: Simulation Of Thermal Decarbonization Of Iron Ore Pelletsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Features of research of iron ore thermal decarbonization kinetics during roasting

I.¹,

Бобков²,

Kulyasov³

et al. 2021

cisisr

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show abstract

“…The works connected with mathematical simulation of heat exchange processes and analysis of the obtained exact and approximate values can be related to the first group [7,8]. Analytical solutions can be usually obtained only at significant simplifications of a mathematical model [9,10]. Temperature relationships of thermal-physical properties of processed iron ore mate-rial and heating gas are not taken into account as a rule, while heat sources (drains) in the layer of ore material are also not taken into account or taken into account rather approximately [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental examination of the chemical-metallurgical roasting process for iron ore raw materials on the fire grate of a roasting conveyor machine

Bobkov,

Dli,

Kulyasov

2023

cisisr

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The results of experimental power engineering examination of operating roasting conveyor machines are presented. These machines are used for complicated energy-intensive chemical-metallurgical process of roasting of iron ore raw materials in moving dense layer with cross feed of heat-carrying gas. The studies were conducted within the temperature ranges of thermal and aerodynamic operating conditions of the existing roasting conveyor machines. The causes of insufficient power engineering efficiency of the chemical-metallurgical roasting process were revealed, qualitative analysis of thermal conditions of roasting dense layer of iron ore raw materials was carried out. The data on temperature distribution of heating gas and iron ore material in different areas of a dynamic dense layer and on a fire grate in different sections of the roasting machine were obtained. The experimental data from technological control of the roasting conveyor machine were presented, as well as the results of chemical and granulometric analyses of roasting iron ore raw materials. Essential deviations in the thermal conditions of operating roasting machine in comparison with designed parameters were found out. The data on roasting conditions of iron ore raw materials in the experimental unit -the sintering pan, which provides simulation of the roasting conditions close to designed ones, are displayed. Insufficient heating in the lower layer levels at the operating roasting machines (in comparison with the designed parameters), stipulated by low speed of heat-carrying gas sweeping in the roasting area was revealed. Temperature heterogeneity along the width of a fire grate, caused by heterogeneity of heat-carrying gas sweeping due to segregation of iron ore material by its size during its loading to the roasting conveyor machine was substantiated scientifically.

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“…Weibin Chen [ 10 ] proposed using bentonite as an additive to improve the consolidation strength of titanium‐containing magnetite oxide pellets and investigated the consolidation mechanism of vanadium–titanium magnetite oxide pellets through X‐Ray diffraction (XRD) phase analysis and scanning electron microscopy (SEM) analysis. Min Gan et al [ 5,11 ] improved the consolidation strength of low‐grade ilmenite pellets by adjusting oxidation preheating duration and temperature. They claimed that under ideal conditions, recrystallization can cause ilmenite particles to produce a solid phase with greater consolidation strength.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of Pellet Consolidation Strength Based on Iron Filings: Microstructural Evolution and Mechanism

Zhang

Wang

et al. 2022

steel research int.

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In order to study the effect of adding finely ground iron filings as iron‐based solid wastes to the pellets’ raw materials on the consolidation strength of pellets, this article uses scanning electron microscopy (SEM) and an image recognition system to identify the microstructure inside iron ore agglomerates, including grain size and porosity. Compressive strength measurements are carried out to quantitatively characterize the consolidation strength of agglomerates. The results demonstrate that when the proportion of iron filings increases, the proportion of particles above 6000 px2 in samples increases from 12.35% to 25.00%, and the internal porosity of agglomerates drops from 22.44% to 10.57%. The compressive strength of agglomerates increases from 2934.00 to 3712.50 N when the particle size of iron filings decreases. The compressive strength of agglomerates increases as preheating temperature drops at the same roasting temperature. When the preheating system is the same, the compressive strength of agglomerates increases as the roasting temperature rises. By adding low‐oxidation iron filings to pellets, Fe2O3 generated through the preheating process has a high chemical reaction activity, allowing the oxidation to be completed at a lower preheating temperature and promoting the crystal bonding of Fe2O3 to form solid‐phase consolidation with high compressive strength.

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Induration aspects of low-grade ilmenite pellets: Optimization of oxidation parameters and characterization for direct reduction application

Cited by 35 publications

References 27 publications

Features of research of iron ore thermal decarbonization kinetics during roasting

Features of research of iron ore thermal decarbonization kinetics during roasting

Experimental examination of the chemical-metallurgical roasting process for iron ore raw materials on the fire grate of a roasting conveyor machine

Reinforcement of Pellet Consolidation Strength Based on Iron Filings: Microstructural Evolution and Mechanism

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