Investigation on the transformation behaviours of Fe-bearing minerals of coal in O2/CO2 combustion atmosphere containing H2O

Huang, Fang; Xin, Shixuan; Mi, Tie; Zhang, Liqi

doi:10.1039/d1ra00673h

Cited by 4 publications

(8 citation statements)

References 44 publications

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“…The ash fusion temperature (AFT) of coal was determined according to the Chinese standard GB/T219‐2008. The influence of iron on the melting behavior of ash is related to the chemical state of iron determined by the atmosphere, especially for high‐iron coal ash [17,31,32] . Firstly, the fusion temperature of ZC iron‐rich coal ash was measured under weak reducing conditions.…”

Section: Methodsmentioning

confidence: 99%

“…The influence of iron on the melting behavior of ash is related to the chemical state of iron determined by the atmosphere, especially for high-iron coal ash. [17,31,32] Firstly, the fusion temperature of ZC iron-rich coal ash was measured under weak reducing conditions. The AFT of blended coal ash was tested in a weak reducing atmosphere using an automatic ash melting point analyzer (5E-AF 3000, Changsha, China).…”

Section: Ash Fusion Temperature Testmentioning

confidence: 99%

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Regulation Mechanism of Ash Fusion of Iron‐Rich Coal in Xinjiang with Different Additives

Lv,

Zhang,

Wang

et al. 2024

ChemistrySelect

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To realize the high‐efficiency utilization of iron‐rich coal (ZC), it is necessary to conduct in‐depth research on its ash fusion characteristics and regulation mechanism. In this paper, the fusion temperature test of ZC coal ash was first carried out in a weak reducing atmosphere, and diatomite (GZT) and Naomaohu high‐calcium coal (NMH) were selected as additives. The results show that the four characteristic temperatures of ZC coal ash are all low under weak reducing conditions. The addition of NMH ash lowered the fusion temperature of ZC coal ash, while the GZT ash increased the fusion temperature to varying degrees. When the addition ratio of NMH ash is less than 40 %, the effect of increasing the difference between the deformation temperature and flow temperature of ZC coal ash is still positive. The addition of NMH ash made the slag system generate a high content of calcium‐magnesium feldspar and calcium‐iron feldspar, decreasing the fusion temperature of the blended coal ash. The addition of GZT ash increased the content of SiO2 in the slag system and promoted the increase of the iron‐pyroxene content, and the formation of the iron‐aluminum pyroxene and cordierite mineral phases, thereby increasing the coal ash fusion temperature.

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Section: Methodsmentioning

confidence: 99%

Section: Ash Fusion Temperature Testmentioning

confidence: 99%

Regulation Mechanism of Ash Fusion of Iron‐Rich Coal in Xinjiang with Different Additives

Lv,

Zhang,

Wang

et al. 2024

ChemistrySelect

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“…The influence of iron on ash melting behavior is closely tied to the chemical state of iron, particularly in high-iron coal ash. 20,26,27 Initially, the AFT of ZC iron-rich coal ash was measured under both air and weak reducing conditions. The AFT of blended coal ash was tested in a weak reducing atmosphere using an automatic ash melting point analyzer (5E-AF 3000, Changsha, China).…”

Section: Ash Fusion Temperature Testmentioning

confidence: 99%

“…17 Fayalite, iron spinel, almandine garnet, clinopyroxene, and other ironcontaining minerals are the primary products formed under high-temperature conditions. [18][19][20][21] Wang et al 12,22 discovered that minerals such as pyroxene with low melting points, pyroxene rich in aluminum, and diopside are formed in iron-rich coal. These iron-containing pyroxenes can form low-temperature compounds at high temperatures, ultimately increasing the ash melting ratio of coal.…”

Section: Introductionmentioning

confidence: 99%

Ash fusion characteristics of iron‐rich coal in Xinjiang under different atmospheres and the influence mechanism of adding red mud and pipeline scale

Lv,

Wang,

Zhang

et al. 2023

Asia-Pacific J Chem Eng

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To realize the high‐efficiency utilization of iron‐rich coal, it is necessary to conduct in‐depth research on the ash fusion characteristics and regulation mechanism. In this paper, the ash fusion temperature test of iron‐rich coal in Xinjiang (ZC) under different atmospheres was first carried out. Then, red mud (HJ) from Huajin Aluminum Industry and black water pipe scale (GDG) were selected as the additives. After the same ashing procedure, the two additives were mixed with iron‐rich coal ash in different proportions to realize the regulation of the chemical composition of the coal ash to improve the ash fusion characteristic. The ash fusion temperature (AFT) experiment was carried out in the automatic ash melting point analyzer, and high‐temperature ash melting slags at different temperatures were prepared. The mineral phases of coal ash and slag were characterized by XRD and compared with the Factsage simulation calculation results to reveal the influence mechanism of coal ash fusion temperature. The result shows that the fusion temperature of ZC iron‐rich coal ash is significantly different between oxidizing atmosphere and weak reducing atmosphere. Compared with the oxidizing atmosphere, the four characteristic temperatures of ZC iron‐rich coal ash are significantly lower under weak reducing conditions, and the difference is about 150°C. The addition of red mud and pipeline scale increased the fusion temperature of ZC coal ash to varying degrees. The addition of HJ ash has little effect on the deformation temperature of ZC coal ash, while the addition of different proportions of HJ ash significantly increases the flow temperature of ZC coal ash. When the addition ratio of HJ ash is 40%, the flow temperature FT of ZC coal ash increases most obviously, which is about 50°C. The addition of HJ ash and GDG ash will lead to an increase in the content of iron‐containing spinel, thereby increasing the ash flow temperature.

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“…Em ambos os difratogramas, observam-se fases cristalinas, como o quartzo e a mulita, fases estas comumente encontradas em cinzas da combustão de carvão mineral [70]. Verificam-se também Backgrounds (halos), no intervalo entre 15° a 40° (2ϴ), característicos de fases amorfas, presença de matéria orgânica, carbono residual e fases vítreas de aluminossilicatos [49,71].…”

Section: Análise Mineralógica Por Drx Das Cinzas Da Combustão De Carv...unclassified

Caracterização e avaliação da atividade pozolânica das cinzas provenientes da queima de carvão mineral das termelétricas do Pecém, Ceará, Brasil

et al. 2021

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RESUMO A tendência de estabilização do consumo de carvão mineral, observada até 2019, foi interrompida devido a pandemia de Sars-Cov 2 que afetou a produção energética baseada em carvão mineral, reduzindo a demanda mundial deste produto. A queima do carvão mineral para a produção energética em usinas termelétricas geram grandes quantidades de resíduos, como as cinzas leves (fly ash), proveniente de processos eletrostáticos e as cinzas de fundo (botton ash), provenientes de processos de dessulfuração do gás da chaminé (Flue Gas Desulfurization - FGD). Em muitos os resíduos são estocados em depósitos ao ar livre, tornando-se um potencial risco ao meio ambiente e aos ecossistemas circunvizinhos. Com vistas a melhorar compreensão das características destes resíduos, buscou-se caracterizar a cinza leve (CV1) e da cinza de fundo (CV2), resíduos provenientes das usinas termelétricas do Pecém I e II, localizadas no estado do Ceará/Brasil, quanto aos parâmetros químicos e físicos por meio de ensaios de composição química por FRX (Fluorescência de Raios X) e EDS (Espectroscopia de Energia Dispersiva), teor de umidade, perda ao fogo, teor de resíduos insolúveis, massa específica, finura pelo método de permeabilidade ao ar, caracterização granulométrica, avaliação microestrutura por MEV (Microscopia Eletrônica de Varredura), termogravimentria, determinação das fases mineralogia por DRX (Difração de Raios X) e avaliação da atividade pozolânica. Evidenciou-se que a CV1 apresenta características compatíveis com cinzas volantes tipo C e atividade pozolânica. Para a cinza CV2, observou-se que não foram atendidos aos requisitos químicos de atividade pozolânica, apresentando também altos teores de trióxido de enxofre e fases cristalinas como a Calcita, provenientes do processo de dessulfuração FGD. Em ambos os casos, as cinzas podem ser utilizadas em compostos cimentícios, desde que compatíveis com as características apresentadas, possibilitando assim a redução e acúmulo do material nas usinas, reduzindo os riscos ao meio ambiente.

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Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O

Abstract: The ratio of Fe2+-glass to Fe3+-glass in ashes from O2/CO2 atmosphere is significantly increased. The iron oxides (hematite or magnetite) formation of included iron minerals may be delayed in O2/CO2. H2O promotes iron oxides formation.

Cited by 4 publications

References 44 publications

Regulation Mechanism of Ash Fusion of Iron‐Rich Coal in Xinjiang with Different Additives

Regulation Mechanism of Ash Fusion of Iron‐Rich Coal in Xinjiang with Different Additives

Ash fusion characteristics of iron‐rich coal in Xinjiang under different atmospheres and the influence mechanism of adding red mud and pipeline scale

Caracterização e avaliação da atividade pozolânica das cinzas provenientes da queima de carvão mineral das termelétricas do Pecém, Ceará, Brasil

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