摘要：A practical approach was introduced to study the inclusion mechanism of chlorine in high purity copper electrorefining from nitric acid system via cyclic voltammetry(CV) combined with electrodeposition experiments. The CV curves display an obvious reduction peak of Cu Cl intermediate, which can provide an insight into the electrochemical behavior of this inclusion. Experimental results show that the increase of HNO3 concentration is favorable to reducing the quantity of chlorine inclusion although there is a slight decline in cathodic current efficiency. The optimum conditions for copper electrorefining in nitric acid system are HNO3 concentration in solution of 1-2 mol/L, moderate temperature of ~35 ℃ with current density not exceeding 25 m A/cm2. Based on the theoretical studies, an optimized copper electrorefining experiment was designed to simulate the industrial electrolysis, by which high purity copper can be obtained with chlorine inclusion less than 10 μg/g and current efficiency higher than 90%.

摘要：为降低铅阳极泥回收工艺过程中废水排放对环境的影响,以高锑低银类铅阳极泥湿法制备锑白为研究对象,构造针对过程盐酸减排的水网络超结构,提出带反应单元的杂质物料平衡模型,建立水网络求解非线性规划问题,并通过实验数据调和整定用水与处理单元特征参数,求解非线性规划问题并根据最优解进行了工业装置路线设计。将该方法应用于铅阳极泥制备锑白工艺设计时,可将废水中酸和有毒金属的排放浓度控制到给定值以下,优化后水的重复利用率可达到87.4%;采用基于超结构的非线性规划对此工艺过程进行优化,可以获得合理的水网络结构,达到减排效果。

摘要：1 基本情况介绍 我厂#6发电机变压器组为单元结线如图1所示,经#204开关（SW4—220）接至220kV母线上,因系统运行要求,主变中性点不直接接地,原设计在中性点装有FZ—110J阀型避雷器,（工频击穿电压有效值为200～250kV）。工频灭弧电压有效值为100kV,在操作#204开关时,由于B相拒动,先后于1974年12月27日和1975年2月6日引起主变中性点避雷器爆炸和主变中性点击穿两次事故。后在主变低压侧加装开关,

摘要：对1Cr18Ni12Mo2Ti制硫铵离心机筛条进行失效分析，发现筛条断裂的主要原因是材料热处理工艺不当，金属组织中出现大量弥散状碳化物颗粒，使材料的硬度增高、脆性增大；其次是结构设计上有引起应力集中的薄弱区，因而加速了不锈钢筛条的腐蚀疲劳断裂。