Cementitious properties and hydration mechanism of Bayer red mud-carbide slag-flue gas desulfurization gypsum system
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- 英文论文题名：Cementitious properties and hydration mechanism of Bayer red mud-carbide slag-flue gas desulfurization gypsum system
- 论文作者：Ying Liu ; Wen Ni ; Di Huang ; Xuming Ma ; Dezhong Li ; Xiaoyan Huang
- 英文论文作者：Ying Liu ; Wen Ni ; Di Huang ; Xuming Ma ; Dezhong Li ; Xiaoyan Huang ; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants ; University of Science and Technology Beijing ; CECEP Engineering Technology Research Institute
- 年：2016
- 作者机构：Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants,University of Science and Technology Beijing;CECEP Engineering Technology Research Institute;
- 英文论文关键词：Bayer red mud ; carbide slag ; flue gas desulfurization gypsum ; cementitious properties ; ettringite ; hydration mechanism
- 会议召开时间：2016-08-28
- 会议录名称：第七届尾矿与冶金渣综合利用技术研讨会暨招远市循环经济项目招商对接会论文集
- 语种：英文
- 分类号：TQ172.1
- 学会代码：EUGQ
- 会议名称：第七届尾矿与冶金渣综合利用技术研讨会暨招远市循环经济项目招商对接会
- 会议地点：中国山东招远
- 主办单位：中国循环经济协会、尾矿综合利用产业技术创新战略联盟、招远市人民政府
- 学会名称：中国硅酸盐学会
- 页数：12
- 文件大小：1590k
- 原文格式：O
- 会议级别：全国
摘要
In order to promote a better utilization of Bayer red mud as a kind of cementitious material in cemented backfill materials,and at the same time to solve the security problem of stockpiling of Bayer red mud,the hydration mechanism and cementitious properties of Bayer red mud with the active action of carbide slag and desuifurization gypsum were investigated by using the analyses of X-ray diffraction,Fourier translation infrared spectroscopy,difference scanning calorimetry-thermogravimetric,scanning microscope techniques,inductively coupled plasma optical emission spectrometry and compressive strength of the hardened paste.The results indicate that the hydration reaction of Bayer red mud is greatly promoted and the mechanical properties of cementitious materials are significantly improved after adding flue gas desuifurization gypsum into Bayer red mud-carbide slag system.Its hydration mechanism is that in Bayer red mud-carbide slag-flue gas desuifurization gypsum system,a large number of extremely low solubility ettringite is generated in hydration reaction.Due to the rapid crystallization of ettringite,the concentration of activated alumina in the system is reduced greatly,further promoting mass dissolution of soluble aluminum in Bayer red mud with ettringite continuing to be generated.On the other hand,as the amount of aluminum dissolution leads residual silicon to be activated in Bayer red mud which continuously generates the C-S-H gel and other hydration products,this leads to the hydration of red mud continuously.C-S-H gel and ettringite are the main strength source of this system.Highlights Cementitious material was prepared with Bayer red mud,carbide slag and flue gas desuifurization gypsum.Hydration mechanism and cementitious properties were investigated.A large number of extremely low solubility ettringite is generated.The concentration of activated alumina in the system is reduced greatly due to the rapid crystallization of ettringite.As the amount of aluminum dissolution leads residual silicon to be activated in Bayer red mud.C-S-H gel and ettringite are the main strength source of this system.
In order to promote a better utilization of Bayer red mud as a kind of cementitious material in cemented backfill materials,and at the same time to solve the security problem of stockpiling of Bayer red mud,the hydration mechanism and cementitious properties of Bayer red mud with the active action of carbide slag and desuifurization gypsum were investigated by using the analyses of X-ray diffraction,Fourier translation infrared spectroscopy,difference scanning calorimetry-thermogravimetric,scanning microscope techniques,inductively coupled plasma optical emission spectrometry and compressive strength of the hardened paste.The results indicate that the hydration reaction of Bayer red mud is greatly promoted and the mechanical properties of cementitious materials are significantly improved after adding flue gas desuifurization gypsum into Bayer red mud-carbide slag system.Its hydration mechanism is that in Bayer red mud-carbide slag-flue gas desuifurization gypsum system,a large number of extremely low solubility ettringite is generated in hydration reaction.Due to the rapid crystallization of ettringite,the concentration of activated alumina in the system is reduced greatly,further promoting mass dissolution of soluble aluminum in Bayer red mud with ettringite continuing to be generated.On the other hand,as the amount of aluminum dissolution leads residual silicon to be activated in Bayer red mud which continuously generates the C-S-H gel and other hydration products,this leads to the hydration of red mud continuously.C-S-H gel and ettringite are the main strength source of this system.Highlights Cementitious material was prepared with Bayer red mud,carbide slag and flue gas desuifurization gypsum.Hydration mechanism and cementitious properties were investigated.A large number of extremely low solubility ettringite is generated.The concentration of activated alumina in the system is reduced greatly due to the rapid crystallization of ettringite.As the amount of aluminum dissolution leads residual silicon to be activated in Bayer red mud.C-S-H gel and ettringite are the main strength source of this system.
In order to promote a better utilization of Bayer red mud as a kind of cementitious material in cemented backfill materials,and at the same time to solve the security problem of stockpiling of Bayer red mud,the hydration mechanism and cementitious properties of Bayer red mud with the active action of carbide slag and desuifurization gypsum were investigated by using the analyses of X-ray diffraction,Fourier translation infrared spectroscopy,difference scanning calorimetry-thermogravimetric,scanning microscope techniques,inductively coupled plasma optical emission spectrometry and compressive strength of the hardened paste.The results indicate that the hydration reaction of Bayer red mud is greatly promoted and the mechanical properties of cementitious materials are significantly improved after adding flue gas desuifurization gypsum into Bayer red mud-carbide slag system.Its hydration mechanism is that in Bayer red mud-carbide slag-flue gas desuifurization gypsum system,a large number of extremely low solubility ettringite is generated in hydration reaction.Due to the rapid crystallization of ettringite,the concentration of activated alumina in the system is reduced greatly,further promoting mass dissolution of soluble aluminum in Bayer red mud with ettringite continuing to be generated.On the other hand,as the amount of aluminum dissolution leads residual silicon to be activated in Bayer red mud which continuously generates the C-S-H gel and other hydration products,this leads to the hydration of red mud continuously.C-S-H gel and ettringite are the main strength source of this system.Highlights Cementitious material was prepared with Bayer red mud,carbide slag and flue gas desuifurization gypsum.Hydration mechanism and cementitious properties were investigated.A large number of extremely low solubility ettringite is generated.The concentration of activated alumina in the system is reduced greatly due to the rapid crystallization of ettringite.As the amount of aluminum dissolution leads residual silicon to be activated in Bayer red mud.C-S-H gel and ettringite are the main strength source of this system.
引文
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[21]Satish.C.B.M,Samuel J.T,TerryJ.L.Ettringitesolubility and geochemistry of the Ca(OH)_2-A1_2(SO_4)_3-H_2O system at 1 atmpressure and 298K[J].Chemical Geology,148(1998)1-19.
[2]Jinwang Chu.Engineering characteristics of red mud and study on mixed stacking technique[J].China Mine Engineering,40(1)(2011)44-47(in Chinese).
[3]Xiangli Nan,Tingan Zhang,Yan liu,et al.Main categories of red mud and its environmental impacts[J].The Chinese Journal of Process Engineering,9(Suppl.No.l)(2009)459-464(in Chinese).
[4]Annual report of the comprehensive utilization of Chinese resources(2014)[J].Renewable Resources and Circular Economy,10(2014)3-8(in Chinese).
[5]Liping Zhu,Wen Ni,Xufang Zhang,et al.Performance and microstructure of cemented whole tailings back filling materials based on red mud,slag and cement[J].Journal of University of Science and Technology Beijing,32(7)(2010)838-842(in Chinese).
[6]Yuyan Zhang,Wen Ni,Dezhong Li,et al.Study on special cementitious materials used in high performance concrete made by slag and minor clinker with red mud[J].2011 ICETCE,5541-5547.
[7]Rixin Liu,Chisun Poon.Utilization of red mud derived from bauxite in self-compacting concrete[J].Journal of Clear Production,112(2016)384-391.
[8]Huizhu Ma,Zongqi Li.Ettringite formation in concrete[J].Building Science,23(11)(2007)105-110(in Chinese).
[9]Yunfeng Hou.Cementing Material[M].China Electric Power Press,Beijing,2012(in Chinese).
[10]Xiaofang He,Yashuang Zhang,Xiaoqing Li,et al.Research progress of thermal analysis in cement hydration[J].Bulletin of the Chinese Ceramic Society,5(2012)1170-1173(in Chinese).
[11]Ying xie,WenpingHou,Xiangdong Wang.Application of differential thermal analysis in the cement hydration research[J].cement,5(1997)44-46(in Chinese).
[12]Jungan Xue.Formation,stability and expansion of ettringite phase——ettringite seminar,Journal of the Chinese Ceramic Society[J].11(2)(1983)247-251(in Chinese).
[13]Yuexing Zhang,Wenxiong Lu,Lv Wang,et al.Study on the hydration mechanism of mineral composite admixtures in cement[J].Fly Ash Comprehensive Utilization,3(2006)16-17(in Chinese).
[14]A.Gruskovnjak,B.Lothenbach,F.Winnefeld,et al.Hydration mechanisms of super sulphated slag cement.Cement and Concrete research[J],2008.pp.983-992.
[15]Xiaogang Zhao.Synthesis of calcium silicate hydrate and its composition,structure and morphology[D].Wuhan University of Technology,Wuhan,2010(in Chinese).
[16]Shumei Yu.Study on dehydration phase of calcium silicate hydrate and its rehydration characteristic^)].Wuhan University of Technology,Wuhan,2012(in Chinese).
[17]Huiru Dong.Instrumental analysis[M].2nd ed.Chemical Industry Press,Beijing,2010(in Chinese).
[18]Hong Jiang.Infrared analysis in the application of cement chemistry[J].Guizhou Chemical Industry,4(2001)30-31(in Chinese).
[19]Qiao Yang,Ke Feng.Research overview of C-S-H gel[J].Development Guide to Building Materials,2(2013)49-51(in Chinese).
[20]Xiling Zhang,Ailing Yao.The activated effects of lime on the mortar strength of slag cementitious materials[J].Bulletin of the Chinese Ceramic Society,26(1)(2007)87-91(in Chinese).
[21]Satish.C.B.M,Samuel J.T,TerryJ.L.Ettringitesolubility and geochemistry of the Ca(OH)_2-A1_2(SO_4)_3-H_2O system at 1 atmpressure and 298K[J].Chemical Geology,148(1998)1-19.
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