Content of quartz and mullite in some selected power-plant fly ash in Czechoslovakia

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI:10.1016/0004-6981(89)90018-8

David Havlíček, Rudolf Přibil, Bohumil Kratochvíl

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引用次数: 8

Abstract

This study was performed primarily to account for the differences between ice forming activity of fly ashes from different sources.

Ten samples of fly ash from ten various power plants on our territory were examined by X-ray powder diffraction to determine the contents of quartz, mullite and hematite. The quartz content varied in the range 5–17% depending on the type of coal and mullite contents varied from 0 to 22%.

The amounts of crystalline phases were compared with data about composition of ashes obtained by elemental chemical analysis. The distribution of silica and aluminia between crystalline phases and amorphous phase is discussed in connection with the origin of fly ash and with the differences observed in the ice forming activity. A direct relationship between the freezing temperatures and the contents of crystalline fractions in the samples does not exist but the presence of mullite and/or hematite in the concentrations found in samples could account for the observed freezing temperatures of droplets containing some of the samples.

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捷克斯洛伐克电厂粉煤灰中石英和莫来石的含量

本研究主要是为了解释不同来源的粉煤灰的成冰活性之间的差异。本文采用x射线粉末衍射法对我国境内10个不同电厂的10个粉煤灰样品进行了检测，以确定石英、莫来石和赤铁矿的含量。石英含量根据煤的类型在5 ~ 17%之间变化，莫来石含量在0 ~ 22%之间变化。结晶相的数量与元素化学分析得到的灰分组成数据进行了比较。讨论了二氧化硅和铝在结晶相和非晶相之间的分布，并与粉煤灰的来源和冰形成活性的差异进行了联系。冻结温度与样品中结晶部分的含量之间不存在直接关系，但样品中发现的浓度中莫来石和/或赤铁矿的存在可以解释所观察到的含有某些样品的液滴的冻结温度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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