添加剂四氟硼酸四乙基铵对石墨负极界面性能的影响

采用恒流充放电、循环伏安(CV)和交流阻抗(EIS)测试方法研究四氟硼酸四乙基铵(Et4NBF4)作为锂离子电池电解液添加剂对石墨负极材料界面性质的影响,通过傅里叶变换红外光谱(FTIR)对固体电解质界面膜(SEI)的成分变化进行分析。结果表明:添加剂Et4NBF4参与了SEI膜的形成,提高了人造石墨(AG)/Li半电池充电容量和后续的循环效率,但是降低了首次充放电效率;首次放电过程中1.0～0.5 V是SEI膜形成和生长的电位区间,而0.5 V以下SEI膜进行不断的修复;添加少量Et4NBF4降低了SEI膜阻抗,提高了电解液与石墨负极的相容性。     

298.15K下Li-Ti-H_2O系φ—pH图及Li_4Ti_5O_(12)的合成

运用双参数模型和同系线性规律对Li2Ti3O7、Li4Ti5O12和Li4TiO4的标准生成吉布斯自由能进行估算,并绘制在298.15 K时,不同离子浓度下Ti-H2O系和Li-Ti-H2O系的φ—pH图。结果表明:在水溶液中,Li4Ti5O12在pH为4.1～13.7之间具有较大的热力学稳定区域,从热力学角度预测了从水溶液合成Li4Ti5O12的可能性,并通过实验在pH为9～10之间,采用TiCl4水溶液强制水解法制备出纯相尖晶石Li4Ti5O12,验证水溶液中合成Li4Ti5O12的可行性。     

Influence of earth gravity on reaction engineering of tubular reactor for high concentration tungsten ion-exchange

The influence of gravity on the reaction engineering of tubular reactor is studied by analyzing the residence time distribution curves.The results show that upflow-feeding mode is more beneficial compared with downflow-feeding mode,since the flow pattern of the fluid in the reactor is closer to plug flow.The result of dynamic experiment conducted in ion-exchange of tungsten metallurgy is as good as that in reaction engineering of ion-exchange column.Whether downflow-feeding or upflow-feeding mode is adopted,breakthrough time decreases when solution concentration increases.Upflow-feeding mode has longer breakthrough time and greater improvement in adsorption capacity especially with high WO3 concentration in ion-exchange.     

水力喷射压裂技术在文南油田的应用

文南油田是典型的深层、高压、低渗透、复杂断块油气藏,而水力压裂是改造低渗透油藏最有效的措施.通过引进水力喷砂射孔压裂技术并在油田推广应用,成功解决了水平井压裂的工艺欠缺问题,并且对于特殊境况无法实施卡封压裂的井提供了有效的解决方法.     

文二联注水站变频调速控制系统技术应用

变频调速装置是实现恒压注水的节能设备。以中原油田采油四厂文二联高压注水泵站节能改造项目为实例,介绍了控制系统的构成和工作原理,阐述了变频调速装置在油田注水站的应用情况。该装置的应用对提高注水系统效率,降低能耗,以及提高自动化管理水平,节约维修资金等发挥了作用。     

Thermodynamic analysis on sodium carbonate decomposition of calcium molybdenum

According to the principle of mass balances and thermodynamic data, 1g [Me]-pH diagrams （Me=Ca, Mo） for Ca-Mo-CO3-H2O system at 25 ℃ were presented with total dissolved carbon-containing ions concentrations of 0.01 mol/L and 1 mol/L, and 1g [Me]-pH diagram for Ca-Mo-H2O system at 25 ℃ was also depicted. The effects of system pH value and total dissolved carbon-containing ions concentrations on the concentrations of the species in Ca-Mo-CO3-H2O system were studied. The results show that the stability region of CaMoO4 reduces significantly in the presence of sodium carbonate. In order to achieve effective leaching of molybdenum from CaMoO4, a certain concentration of sodium carbonate is necessary. High total dissolved carbon-containing ions concentrations and high pH values facilitate to the leaching of CaMoO4 and dissolved sodium carbonate is an efficient leaching agent for decomposing CaMoO4.     

选择性氯化法分离钛铁矿的热力学分析

运用热力学数据和热力学计算方法,绘制出Fe-Ti-O-Cl系不同温度下的热力学平衡图,运用热力学平衡图分析了钛铁矿选择性氯化的热力学条件。     

氧化铝纳米片的气相合成及其力学性能

采用Al片和SiO2粉末为原料,以H2为保护气氛,通过气相沉积方法合成Al2O3纳米片.采用XRD、SEM、TEM和EDS等分析表征手段研究合成的Al2O3纳米片的物相组成、显微形貌和微区成分.结果表明:合成的Al2O3纳米片具有光滑平整的表面,厚度为100～300nm,具有完好的菱方六面体结构.通过纳米压痕仪对合成的...     

反应挤出法碱分解黑钨矿

针对目前黑钨矿碱法分解工艺中存在的反应温度高、生产效率低等问题,开发了一种黑钨矿碱分解新工艺,以双螺杆挤出机为反应器,采用反应挤出法对高黏度黑钨矿的碱分解过程进行了研究,系统考察浸出时间、温度、螺杆转速和碱用量对钨矿浸出效果的影响。在矿水质量比为2.67:1、碱用量为理论量的1.5倍、温度为120℃,螺杆转速为180 r/min和反应时间为2.5 h的条件下,浸出渣中WO3的含量为2.54%,钨矿的浸出率达99.13%。     

使用氧逸度-pH图对辉钼矿浸出过程的热力学分析

根据热力学计算绘制了25℃、150℃、250℃下的Mo-S-H2O系氧逸度-pH图,并据图对MoS2在水溶液中氧化的规律性从热力学上进行了分析,指出了一些可能的技术途径和方法.计算还发现,各温度下氧气均可以彻底氧化辉钼矿.进而对实践中氧气氧化辉钼矿较困难的原因以及强化浸出措施进行了初步的探讨.