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Rare earth recovery from fluoride molten-salt electrolytic slag by sodium carbonate roasting-hydrochloric acid leaching

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Journal of Rare Earths 2023年第8期41卷 1242-1249,I0005页

作者： Hao Wu Huashan Yan Yanzhen Liang sen qiu Xiaowen Zhou Dongmei Zhu Tingsheng qiu Collaborative Innovation Center for Development and Utilization of Rare Metal Resources Co-sponsored by Ministry of Education and Jiangxi Province Jiangxi University of Science and TechnologyGanzhou 341000China Jiangxi Province Key Laboratory of Mining Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Fluorinated rare earth molten-salt electrolytic slag contains a considerable amount of rare earth elements,as well as a variety of heavy metals and fluorides that cause environmental ***,it is of great importance to fully utilise this *** this study,the transformation mechanism of fluorinated rare earth molten-salt electrolytic slag roasted with sodium carbonate,and the regulation mechanism of rare earth leaching under different roasting conditions were investigated with the help of thermodynamic calculation of the reactions and kinetic *** thermodynamic and differential thermal thermogravimetric(DTA-TG)analysis shows that the transformation of rare earth fluoride to rare earth oxide is promoted at elevated ***,the leaching experimental results show that increasing the temperature,time,hydrochloric acid concentration,and liquid-solid ratio can effectively promote the recovery of rare *** optimum experimental conditions are a roasting temperature of 700℃,roasting time of 2 h,and sodium carbonate to molten salt electrolytic slag mass ratio of 0.6,followed by leaching at 80℃with a liquid-solid ratio of 10:1 by adding 3 moI/L hydrochlo ric acid with stirring for 2 *** these conditions,the rare earths in the molten salt electrolytic slag are biologically transformed at a lower temperature and the leaching efficiency of rare earths exceeds 98%.

关键词： Fluorinated rare earth molten-salt electrolytic slag Sodium carbonate Roasting Transformation mechanism Leaching Rare earths

Modified Method for Estimating Organic Carbon Density in Discontinuous Karst Soil Using Ground-Penetrating Radar and Geostatistics

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Journal of Mountain Science 2015年第5期12卷 1229-1240页

作者： LI Lei XIA Yin-hang LIU Shu-juan ZHANG Wei CHEN Xiang-bi ZHENG Hua qiu Hu-sen HE Xun-yang SU Yi-rong Key Laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical Agriculture Chinese Academy of Sciences Huanjiang Observation and Research Station for Karst Eco-systems University of Chinese Academy of sciences Guangxi Institute of Subtropical Crops

The conventional method which assumes the soil distribution is continuous was unsuitable for estimating soil organic carbon density(SOCD) in Karst areas because of its discontinuous soil distribution. The accurate estimation of SOCD in Karst areas is essential for carbon sequestration assessment in China. In this study, a modified method,which considers the vertical proportion of soil area in the profile when calculating the SOCD, was developed to estimate the SOCD in a typical Karst peak-cluster depression area in southwest China. In the modified method, ground-penetrating radar(GPR) technology was used to detect the distribution and thickness of soil. The accuracy of the method was confirmed through comparison with the data obtained using a validation method, in which the soil thickness was measured by excavation. In comparison with the conventional method and average-soil-depth method,the SOCD estimated using the GPR method showed the minimum relative error with respect to that obtained using the validation method. At a regional scale, the average SOCDs at depths of 0-20 cm and 0-100 cm, which were interpolated by ordinary kriging,were 1.49(ranging from 0.03-5.65) and 2.26(0.09-11.60) kgm-2based on GPR method in our study area(covering 393.6 hm2), respectively. Therefore, the modified method can be applied on the accurate estimation of SOCD in discontinuous soil areas such as Karst regions.

关键词： Discontinuous soil Organic carbondensity Soil distribution Estimation method Ground penetrating radar Karst Peak clusterdepression

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有机溶剂提取萃取法生产茶多酚工业试验

现代化工 2006年第9期26卷 49-51页

作者：黄秋森福建中医学院药学系福建福州350003

介绍了以质量分数75%的酒精为提取溶剂、氯仿为去杂萃取剂、乙酸乙酯为纯化萃取剂生产茶多酚的工艺流程、相关装置和生产过程。对不同浓度的酒精提取、杂质去除萃取、纯化萃取等过程和干燥条件进行了工业生产研究,制得的产品茶多酚质量... 详细信息

介绍了以质量分数75%的酒精为提取溶剂、氯仿为去杂萃取剂、乙酸乙酯为纯化萃取剂生产茶多酚的工艺流程、相关装置和生产过程。对不同浓度的酒精提取、杂质去除萃取、纯化萃取等过程和干燥条件进行了工业生产研究,制得的产品茶多酚质量分数大于94.5%,其中活性成分儿茶素总量达80.0%。

关键词：茶多酚萃取剂儿茶素工业试验

双忆阻Shinriki振荡器的超级多稳态和反单调性分析

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电子学报 2019年第11期47卷 2263-2270页

作者：闵富红金秋森南京师范大学电气与自动化工程学院

本文通过在Shinriki振荡器中引入一个有源荷控忆阻,并且利用一个含绝对值项的磁控忆阻代替原电路中的串并联二极管回路,提出了一种含双忆阻器的Shinriki振荡器.根据电路拓扑结构图建立了忆阻振荡器的数学模型,开展了振荡器随电路元件参... 详细信息

本文通过在Shinriki振荡器中引入一个有源荷控忆阻,并且利用一个含绝对值项的磁控忆阻代替原电路中的串并联二极管回路,提出了一种含双忆阻器的Shinriki振荡器.根据电路拓扑结构图建立了忆阻振荡器的数学模型,开展了振荡器随电路元件参数变化时的共存分岔、周期-混沌状态转移等动力学特性分析.结果表明,双忆阻Shinriki振荡器对忆阻的参数值和初始条件有极大的依赖性,随着忆阻参数值和初始条件在特定域内变化,振荡器将呈现出共存反单调现象、不完全对称行为、超级多稳态等非线性动力学行为.此外,基于FPGA开发板完成了双忆阻Shinriki振荡器的数字电路仿真,在示波器上捕捉实验波形,验证了动力学分析的正确性.

关键词：忆阻Shinriki振荡器反单调特性超级多稳态现场可编程门阵列

A perturbation method to the tent map based on Lyapunov exponent and its application

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Chinese Physics B 2015年第10期24卷 78-85页

作者：曹绿晨罗玉玲丘森辉刘俊秀 Guangxi Key Laboratory of Multi-source Information Mining & Security Faculty of Electronic EngineeringGuangxi Normal University School of Computing and Intelligent Systems University of Ulster

Perturbation imposed on a chaos system is an effective way to maintain its chaotic features. A novel parameter perturbation method for the tent map based on the Lyapunov exponent is proposed in this paper. The pseudo-random sequence generated by the tent map is sent to another chaos function - the Chebyshev map for the post processing. If the output value of the Chebyshev map falls into a certain range, it will be sent back to replace the parameter of the tent map. As a result, the parameter of the tent map keeps changing dynamically. The statistical analysis and experimental results prove that the disturbed tent map has a highly random distribution and achieves good cryptographic properties of a pseudo-random sequence. As a result, it weakens the phenomenon of strong correlation caused by the finite precision and effectively compensates for the digital chaos system dynamics degradation.

关键词： perturbation tent map Lyapunov exponent finite precision

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南宋二王南奔对岭南经济文化的影响

北方民族大学学报（哲学社会科学版） 2011年第2期 5-13页

作者：邱树森暨南大学中国文化古籍研究所广东广州510630

宋德佑二年,元至元十三年(1276年)元军占领宋都临安,南宋益王赵昰、广王赵昺二王在宋臣护送下逃奔岭南,中国历代中原民众南迁浪潮出现新的高潮。在这一历史阶段中,汉民族中的新民系——客家人更壮大、更巩固了。他们在岭南地区开辟耕地... 详细信息

宋德佑二年,元至元十三年(1276年)元军占领宋都临安,南宋益王赵昰、广王赵昺二王在宋臣护送下逃奔岭南,中国历代中原民众南迁浪潮出现新的高潮。在这一历史阶段中,汉民族中的新民系——客家人更壮大、更巩固了。他们在岭南地区开辟耕地,发展经济,传承中原传统文化,吸收外来文化,为岭南文化逐渐具备传承性、多元性等特点作出了重大贡献。

关键词：南宋二王宋民南移岭南经济文化