Phase diagram of MgCl2-LiCl-Na2SiO3-H2O system at 200℃ and Synthesis of hectorite
Phase diagram of MgCl2–LiCl–Na2SiO3–H2O (MLSH) system at 200℃ was reported. The phase diagram was designed according to the hydrothermal system in which hectorite was formed. The solid phases were characterized by X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). Lithium silicate, hectorite and karpinskite were observed as solid phases. The presence of hectorite in solid phases was decided by the molar ratio of MgCl2 and Na2SiO3 in the system. When the Mg/Si molar ratio exceeded a certain value, little hectorite was formed even though there was a large amount of LiCl in the system. The reason may be that it was difficult for Li+ to replace the Mg2+ in the framework. As a versatile nanomaterial, hectorite could be synthesized using concentrated natural brine as starting materials by hydrothermal method at 200℃. The phase diagram could be used as the theoretical principle for synthesis of hectorite and comprehensive utilization of concentrated natural brine.
phase diagram hydrothermal method nanomaterial hectorite
Xiaojie Yin Yongzhong Jia Yan Jing Ying Yao Jun Ma
Institute of Salt Lakes, Chinese Academy of Sciences, Xinning Road 18, Xining, 810008, China Graduat Institute of Salt Lakes, Chinese Academy of Sciences, Xinning Road 18, Xining, 810008, China
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
201-206
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）