MATLAB simulation of preparation of Sm-loaded extractant directly from HEH（EHP）

Computer simulation of the preparation process loading rare earth(RE)directly from acidic extractant and RE chloride was established using MATLAB software.The mechanism of the extraction reaction was assumed,and then an experiment was conducted to confirm the mechanism and the apparent equilibrium constant of the reaction was determined as well.Owing to the involvement of H+ ion in the reaction between acidic extractant and RE chloride,the computer simulation of the process was more complicated than that of the extraction only between different rare earths.In the present work,MATLAB software was therefore introduced to handle the resolution of the complicated processing equation,and the simulation was performed by varying some key parameters including feed composition and phase ratio,etc.Consequently this work presented a simple method to simulate the H+ ion involved countercurrent extraction process of rare earths and also provided the practical references for the relative process designing.     

Minimum amount of extracting solvent of AB/BC countercurrent extraction separation using organic feed

For an AB/BC countercurrent extraction separation using organic feed, the conditions to have minimum amount of ex- tracting solvent （Smin） and minimum amount of scrubbing agent solution （Wmin） were discussed, and the formulae of both Sroin and Wmin were deduced. It was shown that only when the ratio of flowrate of central component B leaving aqueous outlet to that leaving organic outlet took a certain optimal value, the AB/BC separation could have Smin as well as Wmin, and this optimal ratio was decided by the separation factors between the three components but independent of feed composition. Smin was only relative to the separation factor of A/C pair but regardless of the separation factors of other pairs as well as feed composition, whereas Wmin was determined by the separation factors between the components together with feed composition. Meanwhile it was also found that the organic stream out of feed stage was same composition as the initial organic feed when the separation system was given by the two minimum amounts and its steady state was achieved. Finally the results above were used to design a LuYb/YbTm separation case and the stage-wise compositions of each component in both the organic and the aqueous phase at steady state were given by computer simulation.     

Clean separation technologies of rare earth resources in China

After a review on the conventional separation process of rare earths (RE), hyperlink extraction technology was introduced and a potential process was proposed for clean separation of RE. A great amount of acid, base and water was consumed in the conventional RE separation process which included the procedures of raw material dissolving, extraction separation and precipitation. Therefore hyperlink extraction technology had been developed, by which the repeated consumption of acid and base could be avoided during the extraction process. And based on the theory and successful applications of the hyperlink extraction technology, we proposed the integral hyperlink process in which the intermediate acid resulted in individual procedures would be recycled and reused after being treated. The proposed process would make it feasible to consume no chemicals except for oxalic acid, and so could be a promising clean separation technology with a significant reduction on consumption and emission.     

基于风险关键特征量的输电线路运行环境风险评估

目前架空输电线路运行环境的整体风险评估主要基于复杂的危险源辨别和风险评估(HIRA)和累积扣分法,为了简化输电线路运行环境风险评估方法,建立了结合最小二乘支持向量机(LS-SVM)和主成分分析(PCA)的架空输电线路运行环境整体风险评估模型。首先,通过对故障跳闸情况进行统计分析,得到10种危害架空输电线路安全的运行环境技术因素,并提取出相应的表征风险特征量;考虑实际数据采集的工作量和风险评估的复杂性,使用PCA对特征量进行降维处理,得到权重较大的关键特征量;将这些风险关键特征量作为LS-SVM的输入,建立了风险评估预测模型。最后,以传统评估结果为样本给出评估模型训练和测试结果,结果表明模型预测分类的精度可以达到95%。     

分光光度法测定混合稀土中的钕

采用分光光度法,以740 nm为测定波长测定混合稀土样品中的钕含量。在此波长下,吸光度-浓度工作曲线的线性相关系数大于0.9999。对已知组成的6个轻稀土混合物样品的测量结果表明,回收率介于98.97%-101.9%之间,检测下限为2.0 mg Nd2O3/ml。本方法可准确测定镨钕混合物、混合轻稀土等产品或中控样品中的钕含量,具有测量结果可靠、速度快、仪器常规和实验条件简便易行等特点,适用含钕样品的快速测定。     

试论林业技术推广在生态林业建设中的问题及其对策

随着城市化建设的不断加快,工业建设也随之发展,生态环境问题越来越受到人们重视。森林不仅起到美化环境的作用,更对净化生态环境又十分重要的影响。探析林业技术推广在生态林业建设中的问题及对策,以期为现代林业技术的推广奠定科学基础,促进我国林业的可持续发展。     

一种应用于配电网合环操作的计算模型与方法

提出了一种简化10kV配电网络合环计算模型,计算合环冲击电流、稳态电流和合环状态下保护灵敏度校验的方法,得出能否进行配网合环操作的结论,为调度员进行10kV配网合环操作提供指导。     

主副线带开关的分支箱结构优化配网结构

在主副线环网结构的基础上，提出了主副线带开关的分支箱结构。该结构具有主副线环网结构的主要优点，在满足可靠性要求的基础上，用开关和分支箱取代环网柜，减少了一次性投资，具有可操作性。最后以广汉供电局的10kV广连路和10kV炳城一路来进行实例分析。