A new high-energy organic magnesium salt [Mg（H2O）6]（BTATz）·2H2O[BTATz=3,6-bis（1H-1,2,3,4-tetrazol-5-yl-amino）-1,2,4,5-tetrazine] was synthesized and characterized by elemental analysis and Fourier transform...A new high-energy organic magnesium salt [Mg（H2O）6]（BTATz）·2H2O[BTATz=3,6-bis（1H-1,2,3,4-tetrazol-5-yl-amino）-1,2,4,5-tetrazine] was synthesized and characterized by elemental analysis and Fourier transform infrared（FTIR） spectrometry.Its crystal structure was determined by X-ray single crystal diffraction.The crystal belongs to monoclinic system with space group C2/c and a=2.1329（7） nm,b=0.52275（16） nm,c=1.5909（5） nm,β=100.471（6）°,V=1.7443（9） nm3,Z=4,μ=0.361 mm-1,F（000）=900 and Dc=1.644 g/cm3.Meanwhile,the thermal behavior of [Mg（H2O）6]（BTATz）·2H2O was studied under the non-isothermal conditions by differential scanning calorimetry（DSC） and thermalgravity-differential thermalgravity（TG-DTG） methods.The enthalpy,apparent activation energy and per-exponential factor of the main exothermic decomposition reaction are 898.88 J/g,139.2 kJ/mol and 1010.48 S-1,respectively.The values of the self-accelerating decomposition temperature（TsADT）,the thermal ignition temperature（TTIT） and the critical temperature of thermal explosion（Tb） for [Mg（H2O）6]（BTATz）.2H2O are 515.13,532.08 and 565.99 K,respectively.展开更多
Magnesium-bearing minerals discovered on the earth so far occur mainly as solid or liquid.The former include magnesite(Mg CO3),dolomite(Mg CO3·Ca CO3),carnallite(Mg Cl2·KCl·6H2O),bischofite(Mg Cl2·...Magnesium-bearing minerals discovered on the earth so far occur mainly as solid or liquid.The former include magnesite(Mg CO3),dolomite(Mg CO3·Ca CO3),carnallite(Mg Cl2·KCl·6H2O),bischofite(Mg Cl2·6H2O)and展开更多
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 diffract...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.展开更多
The changes of demand and market witnessed the continuous revolution and development in the world magnesium industry.Before the 1950s,the development of magnesium mainly attached to the military industry.
Magnesium based alloys with aluminum and zinc were obtained through electrochemical co-deposition from LiCl-NaCl-MgCl2 melt. The possibility of electrochemical co-deposition was discussed in detail by electro-analytic...Magnesium based alloys with aluminum and zinc were obtained through electrochemical co-deposition from LiCl-NaCl-MgCl2 melt. The possibility of electrochemical co-deposition was discussed in detail by electro-analytical methods including cyclic voltametry,square wave voltametry,and chronopotentiometry. The co-deposition happens when the concentration of aluminum and zinc ions is kept at low value and the current density is high enough. The components of alloy elements can be controlled by fixing the components of the feeding salts. A laboratory experiment of the preparation by step-current co-deposition was also performed and certain compositions of the Mg-Al,and Mg-Zn were obtained. The alloys obtained from the co-deposition show a typical as-cast microstructure. The best conditions of electrolysis such as temperature,amount of addition and mode of feeding were discussed in detail.展开更多
1 Introduction Magnesium salts are very important by-product of salt lake industry in West China.Nearly 200 million cubic meters of waste brine are released to the environment
1 Introduction A salt lake is a naturally occurring complex body of water and salt interaction.More than 700 salt lakes are widely distributed in the area of the Qinghai-Tibet Plateau.Most of the salt lakes are famous...1 Introduction A salt lake is a naturally occurring complex body of water and salt interaction.More than 700 salt lakes are widely distributed in the area of the Qinghai-Tibet Plateau.Most of the salt lakes are famous for their abundance of lithium,potassium,magnesium,and boron resources.It is展开更多
基金Supported by the National Natural Science Foundation of China（No.21101127）, the Natural Science Basic Research Plan in Shaanxi Province of China（No.2011JQ2002）, the China Postdoctoral Science Foundation Funded Proj ect（No.20110491676）, the National Defense Pre-research Foundation of China（No.9140A28020111BQ3401） and the National Defense Pre-research Foun-dation of China（No.A312011005）.
文摘A new high-energy organic magnesium salt [Mg（H2O）6]（BTATz）·2H2O[BTATz=3,6-bis（1H-1,2,3,4-tetrazol-5-yl-amino）-1,2,4,5-tetrazine] was synthesized and characterized by elemental analysis and Fourier transform infrared（FTIR） spectrometry.Its crystal structure was determined by X-ray single crystal diffraction.The crystal belongs to monoclinic system with space group C2/c and a=2.1329（7） nm,b=0.52275（16） nm,c=1.5909（5） nm,β=100.471（6）°,V=1.7443（9） nm3,Z=4,μ=0.361 mm-1,F（000）=900 and Dc=1.644 g/cm3.Meanwhile,the thermal behavior of [Mg（H2O）6]（BTATz）·2H2O was studied under the non-isothermal conditions by differential scanning calorimetry（DSC） and thermalgravity-differential thermalgravity（TG-DTG） methods.The enthalpy,apparent activation energy and per-exponential factor of the main exothermic decomposition reaction are 898.88 J/g,139.2 kJ/mol and 1010.48 S-1,respectively.The values of the self-accelerating decomposition temperature（TsADT）,the thermal ignition temperature（TTIT） and the critical temperature of thermal explosion（Tb） for [Mg（H2O）6]（BTATz）.2H2O are 515.13,532.08 and 565.99 K,respectively.
基金co-funded by Chinese Academy of Engineering major consultation projects "Comprehensive Utilization and Sustainable Development of Qinghai Salt Lake" and the "Strategic Research on the Sustainable Mineral Resources Development in China (Chemical and Salt Lake Projects)"
文摘Magnesium-bearing minerals discovered on the earth so far occur mainly as solid or liquid.The former include magnesite(Mg CO3),dolomite(Mg CO3·Ca CO3),carnallite(Mg Cl2·KCl·6H2O),bischofite(Mg Cl2·6H2O)and
基金Funded by the Special Project Major Project for the Transformation of Scientific and Technological Achievements of Qinghai Province(Nos.2019-GX-165 and 2018-NN-152)Youth Innovation Promotion Association CAS(Nos.2019423 and 2018467)the National Natural Science Foundation of China(No.U1507120).
文摘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.
基金Financial support from the "Chun Hui" project (Z 2012084) of the Ministry of Education, PR China, is greatly appreciated
文摘The changes of demand and market witnessed the continuous revolution and development in the world magnesium industry.Before the 1950s,the development of magnesium mainly attached to the military industry.
基金Project(50374012) supported by the National Natural Science Foundation of China
文摘Magnesium based alloys with aluminum and zinc were obtained through electrochemical co-deposition from LiCl-NaCl-MgCl2 melt. The possibility of electrochemical co-deposition was discussed in detail by electro-analytical methods including cyclic voltametry,square wave voltametry,and chronopotentiometry. The co-deposition happens when the concentration of aluminum and zinc ions is kept at low value and the current density is high enough. The components of alloy elements can be controlled by fixing the components of the feeding salts. A laboratory experiment of the preparation by step-current co-deposition was also performed and certain compositions of the Mg-Al,and Mg-Zn were obtained. The alloys obtained from the co-deposition show a typical as-cast microstructure. The best conditions of electrolysis such as temperature,amount of addition and mode of feeding were discussed in detail.
基金supported by the National Natural Science Foundationthe National Key Technologies R&D Program (2011BAE28B01)the 863 Program (2013AA032501)
文摘1 Introduction Magnesium salts are very important by-product of salt lake industry in West China.Nearly 200 million cubic meters of waste brine are released to the environment
基金Financial supports from the NSFCs (21106103, 21276194 and 21306136)the Specialized Research Funds for the Doctoral Program of Chinese Higher Education (20101208110003 and 20111208120003)+1 种基金the Natural Science Foundation of Tianjin (12JCQNJC03400)the Senior Professor Program for TUST (20100405)
文摘1 Introduction A salt lake is a naturally occurring complex body of water and salt interaction.More than 700 salt lakes are widely distributed in the area of the Qinghai-Tibet Plateau.Most of the salt lakes are famous for their abundance of lithium,potassium,magnesium,and boron resources.It is
基金supports from the National Natural Science Foundation of China(Nos.52204268,51974365,91962223)the Natural Science Foundation of Hunan Province,China(Nos.2020JJ5747,2020JJ5749)+3 种基金the Innovation-driven Project of Central South University,China(No.2020CX039)the National“111”Project of China(No.B14034)the Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,China(No.2018TP1002)the Young Elite Scientists Sponsorship Program by CAST,China(No.2019QNRC001).
