Effect of Al2O3/CaO on the melting and mineral transformation of Ningdong coal ash

doi:10.1016/j.cjche.2020.04.001

Abstract

Abstract: Coal ash melting characteristics has a direct impact on the smooth operation of entrained gasifier. Mineral conversion of coal ash is very significant to be investigated, because the mineral can affect the melting temperature and viscosity under high temperature conditions. In this paper, the effects of different Al₂O₃/CaO on the mineral conversion, melting temperature and viscosity of Ningdong coal ash are studied by the combination of experiment and simulation. The trend of melting temperature decreases firstly and rises with increasing Al₂O₃/CaO. The ash melting point reached to the lowest when the ratio is 1.23. XRD and Factsage software are used to analyze crystallization behavior of samples. The results show that the content of anorthite, albite and corundum increases and subsequently decreases, while the content of mullite decreases firstly and then rises with increasing Al₂O₃/CaO. High content with CaO can contribute to form albite and anorthite of low-melting. Besides, high content with Al₂O₃ can tend to produce mullite of high-melting. The results of experimental and simulation are basically the same, which lays a foundation for the melting characteristics of Ningdong coal ash and can provide technical support for the smooth operation of the entrained-gasifier.

Key words: Melting characteristics, Viscosity, Mineral transformation, Al₂O₃/CaO

摘要： Coal ash melting characteristics has a direct impact on the smooth operation of entrained gasifier. Mineral conversion of coal ash is very significant to be investigated, because the mineral can affect the melting temperature and viscosity under high temperature conditions. In this paper, the effects of different Al₂O₃/CaO on the mineral conversion, melting temperature and viscosity of Ningdong coal ash are studied by the combination of experiment and simulation. The trend of melting temperature decreases firstly and rises with increasing Al₂O₃/CaO. The ash melting point reached to the lowest when the ratio is 1.23. XRD and Factsage software are used to analyze crystallization behavior of samples. The results show that the content of anorthite, albite and corundum increases and subsequently decreases, while the content of mullite decreases firstly and then rises with increasing Al₂O₃/CaO. High content with CaO can contribute to form albite and anorthite of low-melting. Besides, high content with Al₂O₃ can tend to produce mullite of high-melting. The results of experimental and simulation are basically the same, which lays a foundation for the melting characteristics of Ningdong coal ash and can provide technical support for the smooth operation of the entrained-gasifier.

关键词: Melting characteristics, Viscosity, Mineral transformation, Al₂O₃/CaO

Feng Wang, Min Yao, Haoyong Kan, Jianping Kuang, Ping Li, Jiashuo Zhang, Yixin Zhang. Effect of Al₂O₃/CaO on the melting and mineral transformation of Ningdong coal ash[J]. Chinese Journal of Chemical Engineering, 2020, 28(12): 3110-3116.

Feng Wang, Min Yao, Haoyong Kan, Jianping Kuang, Ping Li, Jiashuo Zhang, Yixin Zhang. Effect of Al₂O₃/CaO on the melting and mineral transformation of Ningdong coal ash[J]. 中国化学工程学报, 2020, 28(12): 3110-3116.

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Effect of Al₂O₃/CaO on the melting and mineral transformation of Ningdong coal ash

Effect of Al₂O₃/CaO on the melting and mineral transformation of Ningdong coal ash

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