{"title":"Characterization of thermal behavior of two types of kaolin in China by ultrafast Joule heating combined with XRD, FT-IR, TG-DSC and SEM","authors":"","doi":"10.1016/j.tca.2024.179894","DOIUrl":null,"url":null,"abstract":"<div><div>Thermal behavior of sandy kaolin selected from Guangxi and hard kaolin from Inner Mongolia in China were characterised by ultrafast Joule heating combined with XRD, FT-IR, TG-DSC and SEM. The results indicated that the sandy kaolin was composed of kaolinite, muscovite and quartz, and hard kaolin was predominantly composed of kaolinite, with minor quantities of anatase. During ultrafast Joule heating, the layered structure of kaolinite of sand kaolin was destroyed, and all hydroxyl groups were lost at 700 °C, while dehydroxylation completion of the hard kaolin at higher temperature, accompanied by rupture of lamellar kaolinite. Muscovite disappeared completely and accompanied by the formation of mullite at 1100 °C, while quartz is relatively unaffected, resulting in the sandy kaolin consisting of quartz and mullite phases at 1200 °C. In contrast, the transformation rate and crystallinity of mullite phase of hard kaolin was significantly higher than that of sandy kaolin.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermochimica Acta","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0040603124002338","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Thermal behavior of sandy kaolin selected from Guangxi and hard kaolin from Inner Mongolia in China were characterised by ultrafast Joule heating combined with XRD, FT-IR, TG-DSC and SEM. The results indicated that the sandy kaolin was composed of kaolinite, muscovite and quartz, and hard kaolin was predominantly composed of kaolinite, with minor quantities of anatase. During ultrafast Joule heating, the layered structure of kaolinite of sand kaolin was destroyed, and all hydroxyl groups were lost at 700 °C, while dehydroxylation completion of the hard kaolin at higher temperature, accompanied by rupture of lamellar kaolinite. Muscovite disappeared completely and accompanied by the formation of mullite at 1100 °C, while quartz is relatively unaffected, resulting in the sandy kaolin consisting of quartz and mullite phases at 1200 °C. In contrast, the transformation rate and crystallinity of mullite phase of hard kaolin was significantly higher than that of sandy kaolin.
期刊介绍:
Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application.
The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta.
The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas:
- New and improved instrumentation and methods
- Thermal properties and behavior of materials
- Kinetics of thermally stimulated processes