{"title":"捷克斯洛伐克电厂粉煤灰中石英和莫来石的含量","authors":"David Havlíček, Rudolf Přibil, Bohumil Kratochvíl","doi":"10.1016/0004-6981(89)90018-8","DOIUrl":null,"url":null,"abstract":"<div><p>This study was performed primarily to account for the differences between ice forming activity of fly ashes from different sources.</p><p>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%.</p><p>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.</p></div>","PeriodicalId":100138,"journal":{"name":"Atmospheric Environment (1967)","volume":"23 3","pages":"Pages 701-706"},"PeriodicalIF":0.0000,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0004-6981(89)90018-8","citationCount":"8","resultStr":"{\"title\":\"Content of quartz and mullite in some selected power-plant fly ash in Czechoslovakia\",\"authors\":\"David Havlíček, Rudolf Přibil, Bohumil Kratochvíl\",\"doi\":\"10.1016/0004-6981(89)90018-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This study was performed primarily to account for the differences between ice forming activity of fly ashes from different sources.</p><p>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%.</p><p>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.</p></div>\",\"PeriodicalId\":100138,\"journal\":{\"name\":\"Atmospheric Environment (1967)\",\"volume\":\"23 3\",\"pages\":\"Pages 701-706\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1989-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0004-6981(89)90018-8\",\"citationCount\":\"8\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Atmospheric Environment (1967)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0004698189900188\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Atmospheric Environment (1967)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0004698189900188","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Content of quartz and mullite in some selected power-plant fly ash in Czechoslovakia
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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