{"title":"酸、碱活性粉煤灰的微观结构和矿物学性质","authors":"B. Mondal, M. Islam, Md. Emdad Hossain, M. Abser","doi":"10.30799/jacs.201.19050102","DOIUrl":null,"url":null,"abstract":"Fly ash (FA), a coal combustion residue of thermal power plants has been regarded as a problematic solid waste all over the world. In this study FA samples were modified with NaOH and H2SO4. The mineralogical and microstructural characterization were carried out by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS) and Braunauer-Emmett-Tellers multilayer adsorption theory (BET). Experimental data showed that cenospheres were dominated with quartz and mullite glasses with both amorphous and crystalline phases. The acid treatment increased Si/Al ratios by removing impurities and dealuminations but alkali treatment significantly increased total pore volume. The specific surface area of alkali and acid treated samples were found 6.9 m2g-1 and 2.1 m2g-1 respectively, while that of virgin material was 1.5 m2g-1.","PeriodicalId":23586,"journal":{"name":"Volume 5,Issue 1,2019","volume":"5 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2019-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":"{\"title\":\"Microstructural and Mineralogical Properties of Acid and Alkali Activated Coal Fly Ash\",\"authors\":\"B. Mondal, M. Islam, Md. Emdad Hossain, M. Abser\",\"doi\":\"10.30799/jacs.201.19050102\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Fly ash (FA), a coal combustion residue of thermal power plants has been regarded as a problematic solid waste all over the world. In this study FA samples were modified with NaOH and H2SO4. The mineralogical and microstructural characterization were carried out by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS) and Braunauer-Emmett-Tellers multilayer adsorption theory (BET). Experimental data showed that cenospheres were dominated with quartz and mullite glasses with both amorphous and crystalline phases. The acid treatment increased Si/Al ratios by removing impurities and dealuminations but alkali treatment significantly increased total pore volume. The specific surface area of alkali and acid treated samples were found 6.9 m2g-1 and 2.1 m2g-1 respectively, while that of virgin material was 1.5 m2g-1.\",\"PeriodicalId\":23586,\"journal\":{\"name\":\"Volume 5,Issue 1,2019\",\"volume\":\"5 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-02-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Volume 5,Issue 1,2019\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.30799/jacs.201.19050102\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Volume 5,Issue 1,2019","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.30799/jacs.201.19050102","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Microstructural and Mineralogical Properties of Acid and Alkali Activated Coal Fly Ash
Fly ash (FA), a coal combustion residue of thermal power plants has been regarded as a problematic solid waste all over the world. In this study FA samples were modified with NaOH and H2SO4. The mineralogical and microstructural characterization were carried out by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS) and Braunauer-Emmett-Tellers multilayer adsorption theory (BET). Experimental data showed that cenospheres were dominated with quartz and mullite glasses with both amorphous and crystalline phases. The acid treatment increased Si/Al ratios by removing impurities and dealuminations but alkali treatment significantly increased total pore volume. The specific surface area of alkali and acid treated samples were found 6.9 m2g-1 and 2.1 m2g-1 respectively, while that of virgin material was 1.5 m2g-1.
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