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工程科学与技术:2014,46(2):187-191
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再生石膏相组成、热性能及微观形貌变化研究
(1.重庆大学 材料学院;2.重庆建大建筑材料有限公司)
Research on the Changes of Phase Composition,Pyrolysis Characteristics and Microstructure of Recycled Gypsum
(1.College of Material Sci.and Eng.,Chongqing Univ.;2.Chongqing Jianda Building Material Co.,Ltd.)
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投稿时间:2013-08-23    修订日期:2013-10-30
中文摘要: 通过相组成分析、DSC/TG和SEM对再生石膏(RG)的相组成、热性能和微观形貌的变化进行研究并分析其变化机理,旨在揭示再生石膏与天然石膏、建筑石膏存在明显差异。结果表明:再生半水石膏(R-P)的相组成发生改变,半水相降低3.5%左右;再生石膏的热稳定性下降,第1次脱水温度降低8 ℃左右,第2次脱水温度降低6 ℃左右;再生石膏的结晶变差,晶体中裂纹和孔隙增多,晶粒分布不均匀。分析表明,R-P中半水相含量的降低是由于RG中二水相含量降低及颗粒大小分布不均所致,再生石膏结晶水脱水焓的降低以及再生石膏颗粒的减小是造成再生石膏和天然石膏热性能差别大的主要原因。
中文关键词: 再生石膏  热性能  相组成  形貌  机理
Abstract:By using the phase composition analysis,differential scanning calorimetry (DSC)/thermogravimetric (TG) and SEM,the phase composition,pyrolysis characteristics and microstructure changes of recycled gypsum and its mechanisms were studied to reveal the differences among recycled gypsum,natural gypsum and plaster of paris.The results showed that the phase composition,pyrolysis characteristics and microstructure of recycled gypsum had changed.CaSO4·1/2H2O in the R-P reduced approximately 3.5%,and the first and second dehydration temperature dropped 8 ℃ and 6 ℃,respectively.The recycled gypsum crystal became irregularity,had uneven distribution of grain,and the crystal cracks and porosity also increased.The analysis showed that the reduction of CaSO4·1/2H2O in R-P is due to the decrease of the content of CaSO4·1/2H2O and uneven particle size distribution in the RG.And the main reason of the great difference of pyrolysis characteristics between natural and recycled gypsum is that the crystallization water dehydration enthalpy decreases and the particle size reduces.
文章编号:201300948     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(50872160)
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引用文本:
李志新,彭家惠,赵海鑫,赵敏,任利纳,朱登玲.再生石膏相组成、热性能及微观形貌变化研究[J].工程科学与技术,2014,46(2):187-191.
Li Zhixin,Peng Jiahui,Zhao Haixin,Zhao Min,Ren Lina,Zhu Dengling.Research on the Changes of Phase Composition,Pyrolysis Characteristics and Microstructure of Recycled Gypsum[J].Advanced Engineering Sciences,2014,46(2):187-191.