Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions: A Kinetic Study

Qin, Yuelin; Ling, Qingfeng; He, Wenchao; Hu, Jinglan; Li, Xin

doi:10.3390/ma15030987

Cited by 9 publications

(5 citation statements)

References 25 publications

(21 reference statements)

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“…Although the activation energy values for coke and biocoke with 5 wt.% wood pellets were close to the values specified in [18] for a heating rate of 5 • C/min calculated by the Coats-Redfern method, they were marginally lower. This difference can be attributed to the fact that the samples in this study were laboratory-based.…”

Section: Thermogravimetric Characters Of Carbon Sourcessupporting

confidence: 66%

“…The ignition and burnout temperatures of the samples were determined via the intersection method, according to [32]. The Coats-Redfern method was used to estimate the activation energy (E a ) on the combustion zone between the ignition and the burnout temperature [18,33,34].…”

Section: Bc5 G Bc10 Gmentioning

confidence: 99%

“…Moreover, the combustion characteristic indexes of the coke/biocoke can be obtained through the calculation and analysis of TG and DTG curves, which are mainly represented by ignition temperature (T i ) and peak temperature (T p ), which reveal the temperature of maximum mass loss, burnout temperature (T f ), and ∆T, which represents the difference between ignition temperature and burnout temperature [18]. The combustion characteristics of carbon source samples, the temperatures of coke, and two biocoke samples are shown in Table 4.…”

Section: Thermogravimetric Characters Of Carbon Sourcesmentioning

confidence: 99%

“…It was concluded that the change in activation energy E a strongly depends on the conversion rate, reflecting the combustion process's complexity. Moreover, combustion characteristics and kinetics of high-and low-reactivity metallurgical cokes under air atmosphere were investigated by Qin et al [18]. In this research, the coke combustion E a was calculated using the Coats-Redfern method, as well as the Flynn-Wall-Ozawa (FWO) and Vyazovkin methods.…”

Section: Introductionmentioning

confidence: 99%

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Biocoke Thermochemical Properties for Foamy Slag Formations in Electric Arc Furnace Steelmaking

Kieush,

Schenk,

Koveria

et al. 2023

Metals

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This paper is devoted to studying the thermochemical properties of carbon sources (laboratory-scale conventional coke, biocoke with 5 wt.%, and 10 wt.% wood pellet additions) and the influence of these properties on foamy slag formations at 1600 °C. Thermogravimetric analysis (TGA) conducted under air unveiled differences in mass loss among carbon sources, showing an increasing order of coke < biocoke with 5 wt.% wood pellets < biocoke with 10 wt.% wood pellets. The Coats–Redfern method was used to calculate and reveal distinct activation energies among these carbon sources. Slag foaming tests performed using biocoke samples resulted in stable foam formation, indicating the potential for biocoke as a carbon source to replace those conventionally used for this process. Slag foaming characters for biocoke with 5 wt.% wood pellets were improved more than coke. Using biocoke with 10 wt.% wood pellets was marginally worse than coke. On the one hand, for biocoke with 5 wt.% wood pellets, due to increased reactivity, the foaming time was reduced, but it was sufficient and optimal for slag foaming. Conversely, biocoke with 10 wt.% wood pellets reduced foaming time, proving insufficient and limiting the continuity of the foaming. This study highlights that thermochemical properties play a significant role, but comprehensive assessment should consider multiple parameters when evaluating the suitability of unconventional carbon sources for slag foaming applications.

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Section: Thermogravimetric Characters Of Carbon Sourcessupporting

confidence: 66%

Section: Bc5 G Bc10 Gmentioning

confidence: 99%

Section: Thermogravimetric Characters Of Carbon Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Biocoke Thermochemical Properties for Foamy Slag Formations in Electric Arc Furnace Steelmaking

Kieush,

Schenk,

Koveria

et al. 2023

Metals

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show abstract

“…Qin et al [ 16 ] submitted a second publication, entitled “Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions: A Kinetic Study”. The combustion characteristics and kinetics of high- and low-reactivity metallurgical cokes in an air atmosphere were studied using thermogravimetric technique and the apparent activation energy was calculated using different kinetics methods.…”

Section: Short Description Of the Articles Published In This Special ...mentioning

confidence: 99%

Processing of End-of-Life Materials and Industrial Wastes

2022

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This Special Issue (SI) offered the opportunity to present the latest scientific developments and findings in the field of processing of end-of-life materials and solid industrial wastes. Due to the large quantity of wastes generated and to their complex elemental and mineralogical composition, the approaches, methods and processes proposed for their decontamination, energy beneficiation and high-added-value metal recovery are complex and diverse. Some transversal research investigations using wastes as remediation agents and for synthesis of new materials were also included in the SI. After a brief introduction, the main scientific contributions and findings of each article published in the SI are summarized.

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Influence of Carbon Material Properties on Slag‐Foaming Dynamics in Electric Arc Furnaces: A Review

Kieush,

Schenk

2024

steel research int.

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In this article, the impact of conventional carbon sources, alongside potential carbon bio‐sources, on slag‐foaming behavior is investigated. It highlights the complex relationship between these carbon sources and their properties, such as fixed carbon (FC), volatile matters (VMs), mineral composition in ash, reactivity, and wetting, which ultimately influence the slag foaming efficiency. The challenges associated with biochar and the significant differences in foaming behavior are addressed. For biochar to achieve effective slag foaming, it is essential that it contains an FC of at least 60 wt% and ash of less than 5 wt%. Though less impactful than CO generation from iron (II) oxide reduction, VMs from carbon sources, especially with high‐VM biochar, show secondary effects on reaction courses. The disadvantages associated with the high reactivity of biochar can be overcome by improving its physicomechanical and physicochemical properties. Despite the potential of biochar–coke mixtures to benefit slag foaming without enhancing biochar properties directly, challenges such as biochar floatation on the liquid slag surface and rapid burn‐off exist. Biocoke offers foaming results comparable to those of conventional sources. Despite the benefits of biocoke over other carbon sources, the review underscores its relatively unexplored status in the context of slag‐foaming applications.

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Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions: A Kinetic Study

Cited by 9 publications

References 25 publications

Biocoke Thermochemical Properties for Foamy Slag Formations in Electric Arc Furnace Steelmaking

Biocoke Thermochemical Properties for Foamy Slag Formations in Electric Arc Furnace Steelmaking

Processing of End-of-Life Materials and Industrial Wastes

Influence of Carbon Material Properties on Slag‐Foaming Dynamics in Electric Arc Furnaces: A Review

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