从氯化银提取金属银的新方法

含银废液回收金属银的方法各种各样,其中大多数要经过从氯化银还原出单质银的步骤,此步骤的快慢、转化率的高低可影响整个回收过程经济效益.现在从氯化银转变为单质银方式的实质不外乎直接还原和间接还原.前者是氯化银在酸性环境中用适当的还原剂直接还原出单质银.后者则是先用氨水把氯化银溶解为〔Ag(NH_3)_2〕~+,然后用适当还原剂把银从银氨配离子还原出来.     

含微量卤化银废水回收银的工艺

用多种铁盐处理含卤化银废水沉淀银及制取纯银，讨论其反应原理，技术条件及试验结果，全流程Ａｇ回收率≥９７％，产品Ａｇ纯度≥９９．９％。     

从YBaCuO废料中国收金属银

以含银的废弃YBaEuO化合物为原料，对其中所含的贵金属银进行了回收，并对实验过程中的影响因素进行了分析。银回收的具体方法为：用硝酸法溶解YBaCuO粉末样品，生成硝酸盐溶液，再加入盐酸使生成氯化银沉淀，之后氯化银与Na2C03在1000℃共熔得到金属银。分析结果证明，过滤得到的氯化银较为纯净，银的纯度为95．86％，银回收率可达92．56％。     

分银渣中贵金属的回收

对分银渣中金、银等贵金属采用火法工艺处理,贵金属以单质形态富集。试验结果Au、Ag富集率≥95％。     

用硫代硫酸钠从分银渣中提取银

本文对采用硫代硫酸钠浸出银，连二亚硫酸钠还原银的工艺从分银渣中提取银进行了研究，结果表明：当分银渣中含银量为0．38％，硫代硫酸钠的用量为160kg/t，氨水用量为50L/t，浸出温度60℃，浸出温度为3h，采用二段浸出，其浸出率＞86％，采用连二亚硫酸钠还原银，还原率＞95％，同时，还原后液可再生用于浸出。     

从YBaCuO废料中回收金属银

以含银的废弃YBaCuO化合物为原料,对其中所含的贵金属银进行了回收,并对实验过程中的影响因素进行了分析.银回收的具体方法为:用硝酸法溶解YBaCuO粉末样品,生成硝酸盐溶液,再加入盐酸使生成氯化银沉淀,之后氯化银与Na2CO3在1 000℃共熔得到金属银.分析结果证明,过滤得到的氯化银较为纯净,银的纯度为95.86%,银回收率可达92.56%.     

从铜阳极泥提取金和银

用氧化焙烧、稀硫酸浸出铜银－水溶液氯化，溶剂萃取提取金－亚硫酸钠法回收部分银工艺处理铜阳极泥效果良好，直收率高，Ａｕ９３．８１￣９６．２０％，Ａｇ９６．５０％铜铅锡综合利用好。     

银精矿加石灰焙烧过程中银的化学物相变化

采用化学物相分析方法,定量研究了石灰和焙烧气氛对银精矿加石灰焙烧过程中银的化学物相及其相对含量变化的影响,并借助热力学分析手段初步探讨了石灰在主要载银矿物的氧化、解离过程中的作用机制。结果表明：添加石灰能够大大地降低焙砂中的氧化物包裹银含量,如焙烧2h后的氧化物包裹银含量由直接焙烧时的11．08％降到有石灰存在时的4．15％,而与焙烧气氛的关系不大。     

从炼铅的铋银渣中制备硝酸银

介绍了由铋银渣制取的氯化银中除去铅以及从粗硝酸银中除铅和铋,从而获得化学纯硝酸银的工艺流程及原理。     

湿法制备纳米结构银研究进展

介绍了纳米立方体、三角形纳米棱柱、纳米棒、纳米线、纳米管、树枝状、片状、纳米盘、纳米带等纳米结构银的制备方法,包括溶液还原沉淀法、光诱导转化法、辐射还原法、电化学沉积法、模板法、微波或超声波辅助法、水热法、微乳液法等.并对纳米结构银制备方法存在的问题进行了分析.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.