Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement  

作　　者：Yingchun Yang Liqing Chen Xingdong Sun Yuguang Mao 

机构地区：[1]College of Engineering,Anhui Agricultural University,Hefei,230036,China [2]College of Civil Engineering,Hunan University,Changsha,410082,China

出　　处：《Journal of Renewable Materials》2022年第4期1007-1023,共17页可再生材料杂志（英文）

基　　金：This work was supported by University Natural Science Research Project of Anhui Province(KJ2019A0171);National Natural Science Foundation of China(Grant No.52005009);Anhui Province Natural Science Funds for Youth Fund Project(2008085QE273);Anhui Province Key Research and Development Project(202004e11020003).

摘　　要：Herein,micro iron ore tailings(micro-IOTs)were prepared by wet-grinding and applied to improve sulphoaluminate cement(SAC)performance.The physicochemical properties of micro-IOTs were investigated by particle size analysis,XRD,and XPS.The hydrates trait and the hydration mechanism of micro-IOTs-SAC composite were studied by XRD,TGA,MIP,and SEM.The results demonstrated that micro-IOTs with an average grain diameter of 517 nm could be obtained by wet-grinding.The setting time of SAC gradually decreased with increasing micro-IOTs content.By adding 2%micro-IOTs,the compressive strengths of SAC pastes were enhanced about 22%and 10%at 4 h and 28 d,respectively.Moreover,the addition of micro-IOTs accelerated ettringite precipitation and changed its morphology,resulting in early strength improvement of the binary system.And increased later strength by micro-IOTs was closely related to the high content of AH_(3),fine pore structure,and high hydration degree of SAC.The findings suggested one new approach to utilize iron ore tailings in cementbased materials.

关 键 词：Micro iron ore tailings sulphoaluminate cement ETTRINGITE compressive strength hydration process 

分 类 号：TQ172.1[化学工程—水泥工业]