【摘 要】
：
During the last decade, China rare earth (RE) industry has made significant progress and become one of the most important producers in the world. In this paper,
【机 构】
：
State Key Laboratory of Rare Earth Materials Chemistry and Applications,Beijing Institute of Founder
【基金项目】
：
国家自然科学基金;the Ministry of Science and Technology of China;北京大学校科研和教改项目
论文部分内容阅读
During the last decade, China rare earth (RE) industry has made significant progress and become one of the most important producers in the world. In this paper, the recent developments in both fundamental research and industrial application are briefly reviewed: (1) the development and application of Theory of Countercurrent Extraction, (2) the novel solvent extraction process and its application in industry for separating heavy rare earth elements (Tm, Yb, Lu), yttrium (Y), and scandium (Sc), (3) the on-line analysis and automatic control of countercurrent extraction, (4) the eco-friendly process for RE/Th separation of bastnasite in Sichuan Province and electrochemical process for Eu/RE separation, and (5) the optimized flowcharts for typical rare earth minerals in China.
其他文献
本文结合浙江纺织服装职业技术学院计算机应用技术专业课程开发的实际,总结了程序设计课程开发的步骤,并以实例加以阐述,强调基于工作过程,任务驱动的课程开发,学生通过对工
本文从分析中西方非言语行为的差异入手,探讨了大学英语教师课堂教学中应用非言语行为的方法和手段,揭示了大学英语教师正确使用非言语行为对于课堂教学的意义。
This artic
电力系统继电保护的误动作将给电力生产和系统的稳定运行带来危害,本文针对浩良河一次变220KV线路光纤差动保护中应用的远跳回路原理进行了分析,并提出了防范方案,为防止远跳
文章根据建构主义的学习理论,提出了导演式教学模式的基本概念和在教学中的具体应用.该教学模式体现了以学生为主体、重素质和能力培养的教育思想.
烧伤是对病人破坏性最大的一种伤害.尽管在经济落后的地区,医疗机构也会应用大量的医疗资源配以高质量的监护和临床关注来治疗烧伤,但却很少关注管理成本这个问题.很少有关于
In order to improve machining accuracy and efficiency, a software-controlled system of ultra-precision machining for axisymmetric aspheric mirror, using techniq
With recent advances of quantum computation, new threats have closed in upon to the classical public key cryptosystems. In order to build more secure bit commit
"非典"患者普遍存在着一定的心理负担,定西地区医院通过细致的工作,用实际行动去感化患者,最终取得了阶段性胜利.
B. Libert and J. Quisquater proposed an identity(ID)-based threshold decryption scheme. This paper found flaw in their security reduction and presented two meth