Effects of Fe2O3 addition on the thermoplasticity and structure of coking coal matrix during thermoplastic stage of pyrolysis

Qiu, Shuxing; Zhang, Shengfu; Suo, Guangsheng; Qiu, Guibao; Yin, Cheng; Li, Yang; Hu, Meilong; Xiao, Xiong; Li, Wen

doi:10.1016/j.fuel.2019.116305

Cited by 16 publications

(4 citation statements)

References 47 publications

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“…The diffraction peak of α-Fe was weak in the spectra of bluecoke with the Fe 2 O 3 /BC absorber. This result indicates that Fe 2 O 3 was transformed into Fe during microwave pyrolysis . As shown in eqs –, Fe 2 O 3 was reduced to Fe 3 O 4 , FeO, and Fe at a high temperature by the C in coal or H 2 and CO in coal gas .…”

Section: Resultsmentioning

confidence: 86%

“…This result indicates that Fe 2 O 3 was transformed into Fe during microwave pyrolysis. 52 As shown in eqs 5−7, Fe 2 O 3 was reduced to Fe 3 O 4 , FeO, and Fe at a high temperature by the C in coal or H 2 and CO in coal gas. 24 A strong diffraction peak of α-Fe was obtained in the spectra of bluecoke with the Fe 2 O 3 absorber, indicating that Fe 2 O 3 was mainly reduced to Fe.…”

Section: Resultsmentioning

confidence: 99%

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Novel Approach for Enhanced Catalytic Microwave Pyrolysis of Low-Rank Coal

Zhou

Yang

et al. 2020

Energy Fuels

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Microwave pyrolysis technology used for the efficient and clean conversion of low-rank coal is of concern in this study. An efficient and cheap Fe 2 O 3 /bluecoke (Fe 2 O 3 /BC) absorber with a wrapped structure was prepared by the hydrothermal synthesis method using ferric nitrate nonahydrate (iron source), sodium hydroxide (precipitation agent), and CTAB (protective agent), and the effects of BC, Fe 2 O 3 , and Fe 2 O 3 /BC absorbers on microwave pyrolysis of low-rank coal were investigated through some analytic methods, such as scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), and gas chromatography−mass spectrometry (GC−MS). The pyrolysis temperature, yields, and characteristics of pyrolysis products (bluecoke, pyrolysis water, tar, and coal gas) were examined and compared to verify the effect of the Fe 2 O 3 /BC absorber. Results showed that the temperature increment rate was improved by these absorbers, and the highest temperature increment rate was obtained with the Fe 2 O 3 /BC absorber, followed by Fe 2 O 3 and BC absorbers. The yield of the liquid product (pyrolysis water and tar) obtained with the Fe 2 O 3 /BC absorber was the highest, arriving at 14.31 wt %, in which the yield and carbon content of tar were 6.54 and 20.40 wt %, respectively. The characteristics of the products indicated that all of these absorbers enhanced the catalytic cracking reactions of coal, but Fe 2 O 3 /BC performed the best among the studied absorbers. A synergistic effect that promoted liquefaction and inhibited coal gasification was exerted by Fe 2 O 3 and BC, and it may have been caused by the composite component and wrapped structure of the Fe 2 O 3 /BC absorber.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Novel Approach for Enhanced Catalytic Microwave Pyrolysis of Low-Rank Coal

Zhou

Yang

et al. 2020

Energy Fuels

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“…Then, the polycondensation of the aromatic rings gradually increases, the aromatic layers begin to accumulate and overlap, and the order degree of the graphitized microcrystals of the coke increases, resulting in the formation of aromatic carbon with a higher order. However, the addition of Fe 2 O 3 inhibits the decomposition and removal of amorphous materials, 24 which leads to the enhancement of the noncrystalline peaks and reduction of the peak difference in the Raman analysis of the iron coke.…”

Section: Resultsmentioning

confidence: 99%

Influence of Fe₂O₃ on the Properties and Structure of Iron Coke

Qiu,

Yu,

Chen

et al. 2023

ACS Omega

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Iron cokes were produced in an electrical furnace from a coal blend containing varying levels of added Fe 2 O 3 . The effects of Fe 2 O 3 on the properties and structure of the iron coke were then investigated using the coke for metallurgy determination of mechanical strength, determination of coke reactivity and coke strength after the reaction, X-ray diffraction, Raman spectroscopy, and a method for quantitative analysis of the minerals in coal and coke. Further, the relationships between the properties and structures of iron coke samples were established. The results show that the addition of Fe 2 O 3 can reduce the tumble strength, coke strength after the reaction, aromaticity, microcrystalline size, graphitization degree, crystalline volume, and carbon order degree of the iron coke and increase the abrasion resistance, coke reactivity index, and pulverization rate. Moreover, the degree of influence increases with increasing levels of added Fe 2 O 3 . The Fe 2 O 3 is mainly transformed into metallic iron during the coking process, and part of metallic iron is converted into Fe 3 O 4 during iron coke gasification. With an increasing Fe 2 O 3 content, the trend of the change in the minerals from Fe to Fe 3 O 4 becomes much more obvious, resulting in deeper influences on the iron coke thermal properties. There are obvious correlations among the iron coke reactivity and iron coke strength after the reaction and the crystalline volume, carbon order degree, and metallic iron content. It is concluded that the addition of Fe 2 O 3 decreases the crystalline volume and carbon order degree and increases the metallic iron content, resulting in increases in abrasion resistance and coke reactivity and decreases in tumble strength and coke strength after the reaction.

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“…Thus, this method is rarely used in the study of coking coal drying. Qiu et al [17] found that the added Fe 2 O 3 decreases the plastic range and weight loss rate of the coal matrix. G. Wang [18] found that the addition of sodium salt can cause coke to crack.…”

Section: Introductionmentioning

confidence: 99%

Indirect Drying and Coking Characteristics of Coking Coal with Soda Residue Additive

Zhang

2021

Energies

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To improve indirect drying efficiency, the effect of soda residue on the drying characteristics of coking coal were studied using a self-made indirect drying system. A tube furnace was used in the dry distillation of coal samples with soda residue, and the coke properties were analyzed. The results indicated that the soda residue has a significant influence on the increase in the heating rate of coal samples in the temperature distribution range of 90 to 110 °C. With the addition of 2%, 5%, and 10% soda residue, the drying rates increased by 11.5%, 25.3%, and 37.3%, respectively at 110 °C. The results of dry distillation show that addition of 2%, 5% and 10% soda residue decreases the carbon loss quantity by 4.67, 4.99, and 8.82 g, respectively. The mechanical strength of coke samples satisfies the industrial conditions when the soda residue ratio ranges from 2% to 5%. Soda residue can improve the active point of coke dissolution reaction and inhibit coke internal solution. Economically, coking coal samples mixed with soda residue have an obvious energy saving advantage in the drying process. Energy saving analysis found that it can reduce cost input by 20% than that of the normal drying method.

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Effects of Fe2O3 addition on the thermoplasticity and structure of coking coal matrix during thermoplastic stage of pyrolysis

Cited by 16 publications

References 47 publications

Novel Approach for Enhanced Catalytic Microwave Pyrolysis of Low-Rank Coal

Novel Approach for Enhanced Catalytic Microwave Pyrolysis of Low-Rank Coal

Influence of Fe₂O₃ on the Properties and Structure of Iron Coke

Indirect Drying and Coking Characteristics of Coking Coal with Soda Residue Additive

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Effects of Fe2O3 addition on the thermoplasticity and structure of coking coal matrix during thermoplastic stage of pyrolysis

Cited by 16 publications

References 47 publications

Novel Approach for Enhanced Catalytic Microwave Pyrolysis of Low-Rank Coal

Novel Approach for Enhanced Catalytic Microwave Pyrolysis of Low-Rank Coal

Influence of Fe2O3 on the Properties and Structure of Iron Coke

Indirect Drying and Coking Characteristics of Coking Coal with Soda Residue Additive

Contact Info

Product

Resources

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Influence of Fe₂O₃ on the Properties and Structure of Iron Coke