PHASE DIAGRAM OF SYSTEM NdCl_3-LiCl-KCl

The phase diagram of system NdCl_3-LiCl-KCl has been investigated by DTA.Six surfacescorresponding to the prhnary crystallization of NdCl_3,LiCl,KCl,γ-KCl·NdCl_3,β-3KCl·NdCl_3 and 2KCl·NdCl_3 respectively,eleven univariant lines related to the sec-ondary crystallization,two ternary eutectics E_1(70.5wt-% NdCl_3+8.0wt-% KCl,360℃)and E,(5.0wt-% NdCl_3+ 53.0wt-% KCl,355℃)and one ternary peritectic P(67.0wt-% NdCl_3+10.0wt-% KCl,375℃)were found.It is also chtrified that this studyon the system NdCl_3- KCl differs from previous work in the two transition temperatures:e_1(77.0 wt-% NdCl_3,484℃),e_2(40.0wt-% NdCl_3,620℃),p(70.0wt-%NdCl_3,610℃),3KCl·NdCl_3(690℃)and two reactions:α-3KGl·NdCl_3β-3KGl·NdCl_3 (355℃)β-SKGl·NdCl_3γ-3KCl·NdCl_3 (450℃)The eutectic point e_5(31.0wt-%LiCl,460C)is determined for the pseudobinary system3KCl·NdCl_3—LiCl.     

氯化钾溶液中离子水化的分子动力学模拟

使用Material Studio软件包中的COMPASS力场,采用分子动力学模拟的方法研究了温度为298.15 K时,浓度分别为1.065 mol/L、2.140 mol/L、3.129 mol/L的氯化钾溶液中离子水化的微观结构和动力学性质.发现浓度对离子近程水化的结构有一定的影响,随着溶液浓度的增加O-O径向分布...     

利用磷石膏制取硫酸钾的工艺研究

本文介绍了以磷化工附产物磷石膏为原料,将氯化钾转化成硫酸钾,探讨了氨水的浓度,反应的温度以及加料的顺序,物料的配比对硫酸钾产率的影响。     

Influence of composite LiCl-KCl molten salt on microstructure and electrochemical performance of spinel Li4Ti5O12

A series of spinel Li₄Ti₅O₁₂ samples were synthesized via a composite molten-salt method (CMSM) using the mixtures of LiCl and KCl with different L values (L is defined as the molar ratio of LiCl:KCl) as the reaction media. It is found that the melting point of the composite molten salt can effectively influence the formation of particles, and leads to different electrochemical performances of the as-prepare Li₄Ti₅O₁₂. The investigations of X-ray diffraction (XRD), particle size distribution (PSD), Brunauer-Emmet-Teller (BET) surface area, and scanning electron microscopy (SEM) indicate that the as-prepared Li₄Ti₅O₁₂ with L = 1.5 is a pure phase, and has uniform homogeneous octahedral shape particles, rather narrow PSD, and high BET surface area. Electrochemical tests show that the optimized Li₄Ti₅O₁₂ with L = 1.5 has an initial discharge capacity of 169 mAh g⁻¹ and an initial charge-discharge efficiency of 94% at 0.2 C rate, and achieves good rate performances from 0.2 C to 5 C.     

温度对S135钻杆钢在3.5%KCl溶液中腐蚀行为的影响

基于理论分析和采用挂片实验,SEM以及电化学测量技术,研究了S135钻杆钢在不同温度下3.5%KCl溶液中的腐蚀行为.结果表明:钻杆钢试样开路电位随着温度升高负移;不同温度下的腐蚀控制因素是造成腐蚀速率变化的主要原因;电化学腐蚀主要受阳极反应控制;系统"弥散效应"随温度升高而增强,平均腐蚀速率呈现先增加后降低的趋势.     

磷酸二氢铵脱除气相氯化钾的模拟与实验

脱除生物质燃烧中气相氯化钾,有助于消除受热面的积灰和腐蚀。采用热力学化学平衡分析方法探索了磷酸二氢铵脱除气相氯化钾的反应特性,考察了温度和化学计量比对反应的影响,结果表明磷酸二氢铵在700～950℃范围内可以有效地将气相氯化钾主要转化为磷酸氢二钾。利用X射线衍射分析对沉降炉实验得到的反应产物进行物相分析,探索了磷钾摩尔比、停留时间、温度对磷酸二氢铵脱除氯化钾的影响,实验结果表明增加停留时间以及磷钾摩尔比均可以促进KCl的脱除,停留时间3 s,磷钾摩尔比为1时,700～1000℃下的反应产物中未检测到物相KCl,而生成了磷酸氢二钾、磷酸二氢钾、偏磷酸钾、焦磷酸钾、磷酸钾铵、磷酸二氢铵钾等产物。结果有助于深入研究磷酸二氢铵用于脱除燃烧中碱金属离子。     

KCl对微波法制备均分散α-Fe2O3纳米粒子的影响

用微波辅照法制备了均分散α-Fe2O3纳米粒子.粒子的形状基本上是假立方体,粒子的大小与体系中的氯离子浓度呈很好的线型关系.氯离子浓度越大粒子越大.陈化时间随KCl用量的增加而缩短.实验事实表明在α-Fe2O3粒子的成长过程中,初生微晶直接向晶核上沉积起了很大的作用.     

KCl/聚合醇协同防塌作用机理研究

借助Zeta／sizer3000胶体电位粒度仪、Novasina水活度仪以及Texas-500界面张力仪，研究了氯化钾与强抑制性聚合醇CXGl协同作用对钻井液ζ电位、水活度以及油／水界面张力的影响规律，并结合传统的吸附、分散等防塌实验方法，探讨了氯化钾与CXC-1的协同防塌作用机理。研究表明，CXC-1具有降低页岩负电性、降低钻井液水活度和油／水界面张力的特性；与KCl复配时，CXC-1浊点降低，在粘土颗粒上的吸附量增加，页岩负电性和钻井液水活度进一步降低，同时仍然保持较低的油／水界面张力，协同防塌效果显著。     

对S-NPK生产若干问题的探讨

根据多年的生产经验,对S-NPK生产转化部分反应槽及其搅拌器的选型,转化的工艺条件,中和造粒常见流程优缺点,如何提高干燥机的热效率,转化、造粒、干燥、冷却尾气的净化装置配置等问题进行了讨论,并提出一些有益的建议。     

Gypsum crystallization and potassium chloride regeneration by reaction of calcium chloride solution with potassium sulfate solution or solid

Gypsum crystallization along with the simultaneous regeneration of KCl was investigated by the reaction of CaCl2 solution with K2SO4.Well developed sheet structure gypsum crystals were produced when K2SO4 solution was added into the CaCl2 solution by slow titration or in multiple stages over 2-8 h followed by 2 h equilibration.In order to regenerate KCl solution as concentrated as possible,K2SO4 solid was added into the given CaCl2 solution instead of K2SO4 solution,obtaining gypsum crystals with almost the same quality by multistage addition with[SO4 2-]/[Ca 2+]molar ratio no larger than 0.8.However,impurity of K2SO4·CaSO4·H2O was detected by XRD and was further confirmed by SEM-EDS in the produced crystals when the[SO4 2-]/[Ca 2+] ratio increased to 1.1.It is proved that appearance of the double sulfate is attributed to the relatively high concentration of K2SO4.So,it is essential to properly control the[SO4 2-]/[Ca 2+]ratio and make sure[Ca 2+ ]in excess to suppress the solubility of CaSO4 even at the expense of low calcium removal rate.