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The Salt Attack Performance of Magnesium oxychloride Cement Exposure to Three Kinds of Brines

Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 155-166页

作者：黄青 LI Ying CHANG Chenggong WEN Jing DONG Jinmei ZHENG Weixin A Danchun LIU Pan DONG Fei ZHOU Yuan 肖学英 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXinning 810008China Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province Xining 810008China University of Chinese Academy of Sciences Beijing 100049China

Salt attack performance of magnesium oxychloride cement(MOC) in brine was investigated from the viewpoints of strength development and strength coefficient. Microstructure was studied using quantitative X-ray diffraction(QXRD), thermogravimetry(TG) and scanning electron microscopy(SEM). The results show that MOC mortars have outstanding salt attack performance after aging brine and raw brine immersion. The salt attack coefficients of MOC mortars are higher than 0.8, which is qualified for application in saline soil and salt lake area. The reason is that salt brine solution enters into the voids of MOC and plays a role of toughening and strengthening in the MOC.

关键词： magnesium oxychloride cement salt attack performance saline soil salt lake area

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Thermal Dechlorination Kinetics of Rare Earth oxychlorides

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Journal of Rare Earths 2007年第S1期25卷 8-12页

作者： Hee-Chul Yang Yong-Zun Cho Hee-Chul Eun Eung-Ho Kim In-Tae Kim Advanced Fuel Cycle Process Development Group Korea Atomic Energy ResearchInstituteDaejeon 305-353 Korea

The kinetics of a thermal dechlorination and oxidation of NdOCl and GdOCl were investigated by using a non-isothermal thermogravimetric analysis under various oxygen partial pressures. The conversions of NdOCl and GdOCl into each of their stable oxides (Nd2O3 and Gd2O3) appeared to be an oxygen-dependent endothermic and one-step reaction. The observed activation energy for the conversions of NdOCl and GdOCl were determined as 228.3±6.1 kJ·mole-1 and 137.7±4.1 kJ·mole-1, respectively. The conversions of NdOCl and GdOCl into each of their stable oxides (Nd2O3 and Gd2O3) could be described by a power law (g(α)=α3/2) and a linear-contracting boundary reaction (g(α)=α), respectively.

关键词： oxychloride dechlorination oxidation high temperature rare earths

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FORMATION MECHANISM ON PHASE 5 AND PHASE 3

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Science China Chemistry 1991年第12期34卷 1501-1509页

作者：张振禹戴长禄张铨昌郭伯芝刘蔚玲 Institute of Geology Academia Sinica Beijing 100029 PRC

From the viewpoint of crystallography and thermodynamics the formation and phase-transformation reaction of phase 5[Mg,(OH)5Cl·4H2O] and phase 3[Mg2(OH)3Cl·4H2O] as a major resultant for the hardening reaction of magnesium oxychloride cement have been systematically investigated. It is recognized that the formation of phase 5 and phase 3 is mainly controlled by the molar ratio of MgO, MgCl2, and H2O in the initial reaction mixture. Phase 5 and phase 3 are formed by the reaction between MgO or Mg2+ dissolved out from MgO and the aqueous solution of MgCl2. In the system of MgO-MgCl2-H2O both phase 5 and phase 3 are metastable phases, and under given conditions phase 5 may transform into phase 3 and the latter also into Mg(OH)2.

关键词： magnesium oxychloride cement hardening reaction phase-transformation mechanism.

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Low Temperature Chlorination of Nd2O3by Mechanochemical Method with CCl4

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Materials Sciences and Applications 2013年第7期4卷 419-431页

作者： Takayuki Nagai Shin-Ichi Kitawaki Nobuaki Sato Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai Japan Nuclear Fuel Cycle Engineering Laboratories Japan Atomic Energy Agency Naka Japan Nuclear Fuel Cycle Engineering Laboratories Japan Atomic Energy Agency Naka Japan Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai Japan

For a chlorinating method at low temperature, the possibility of chlorination of Nd2O3 by a mechanochemical reaction with CCl4 was studied using a planetary ball mill. The mechanochemical experiments were conducted by changing the pot materials, milling time, molar ratio of CCl4/Nd2O3, and revolution speed. As the results of obtained products by X-ray diffractometry and Raman spectroscopy, it was confirmed that the chlorination to NdOCl from Nd2O3 with CCl4 was advanced at room temperature in a zirconia or tungsten pot with balls. We found that an extension of the milling time and an increase of the number of ball were effective to the chlorination to NdOCl and that tensile stress remained in the milled powder by using a planetary ball mill.

关键词： Mechanochemical Method Carbon Tetrachloride Neodymium Oxide Low Temperature Chlorination Neodymium oxychloride XRD RAMAN Spectroscopy

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