Compositions and distribution of fly ash in low-melting zone

doi:10.11949/j.issn.0438-1157.20160778

Abstract

Abstract:

The melting temperature distribution of fly ash used to prepare fiber is a key to the composition ratio for reducing the melting temperature. Using X-ray fluorescence spectrometry and ash fusion point determination meter, the compositions and fusion temperature of five kinds of fly ash samples were measured. Ternary phase diagram with Al₂O₃+SiO₂, CaO+MgO, Fe₂O₃+TiO₂ for three-phase coordinate was obtained based on the experimental results in the present study and the data of compositions and melting temperature of 117 fly ash samples in literature. Meanwhile, the fly ash melting temperature profile was derived from the zoning method according to different melting temperature. With the effort of distinguishing the compositions of fly ash in low-melting zone, the regularities of its compositions and melting temperature have been established. It has been proved that the compositions and distribution of fly ash in the low melting regions (FT<1350℃) are well consistent with the low melting point regions of 1350℃ in CaO-Al₂O₃-SiO₂ ternary phase diagrams where the minor components are converted to the equal charge of main components, leading to a method of reducing the melting temperature of the fly ash with high melting temperature.

Key words: fly ash, low-melting zone, ternary phase diagram, melting temperature, alumina, silica

摘要：

粉煤灰的熔融温度分布图对粉煤灰成纤的降熔配比具有指导意义。利用X荧光光谱仪和灰熔点测试仪，分别测得5种不同来源粉煤灰样品的组成和熔融特性温度。运用实验所测值与117种粉煤灰组成及熔融温度的文献值，以Al₂O₃+SiO₂、CaO+MgO、Fe₂O₃+TiO₂为三相坐标制成三元相图，按照熔融温度高低划分不同区域，得到粉煤灰熔融温度分布图，找出低熔区（流动温度FT<1350℃）的组成及其组成与熔融温度的分布规律。同时将次要组分通过等电量换算后标在CaO-Al₂O₃-SiO₂三元相图中，发现所研究粉煤灰在低熔区的组成与CaO-Al₂O₃-SiO₂三元相图中1350℃低温共熔区的组成具有良好的一致性，由此找出高熔融温度粉煤灰成纤的降熔调配方法。

关键词: 粉煤灰, 低熔区, 三元相图, 熔融温度, 氧化铝, 二氧化硅

CLC Number:

TB321

WU Pingping, ZHANG Zewu, CHEN Jianding. Compositions and distribution of fly ash in low-melting zone[J]. CIESC Journal, 2017, 68(5): 1767-1772.

吴萍萍, 张泽武, 陈建定. 成纤性粉煤灰的低熔区组成及分布[J]. 化工学报, 2017, 68(5): 1767-1772.

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