氧气管道内部喷砂除锈喷头改进

介绍管道内喷砂除锈所用喷头的改进及效果。     

不同填料曝气生物滤池启动挂膜试验研究

不同填料曝气生物滤池在相同条件下进行挂膜试验。进水流向为上流式,挂膜方式为复合接种挂膜,即先用活性污泥闷曝接种,然后逐步提高进水流速,直到滤料表面形成稳定的生物膜。结果表明:33 d后挂膜成功,在温度为16～24℃,水力停留时间(HRT)为1 h,DO为6 mg/L的情况下,陶粒BAF对CODMn和NH3—N的去除率分别为23%和80%;沸石BAF的去除率分别为27%和84%;组合填料BAF去除效果最好,去除率分别为32%和92%。     

Engineering Bimetallic Ag–Cu Nanoalloys for Highly Efficient Oxygen Reduction Catalysts: A Guideline for Designing Ag‐Based Electrocatalysts with Activity Comparable to Pt/C‐20%

Development of highly active and stable Pt‐free oxygen reduction reaction catalysts from earth‐abundant elements remains a grand challenge for highly demanded metal–air batteries. Ag‐based alloys have many advantages over platinum group catalysts due to their low cost, high stability, and acceptable oxygen reduction reaction (ORR) performance in alkaline solutions. Nevertheless, compared to commercial Pt/C‐20%, their catalytic activity still cannot meet the demand of commercialization. In this study, a kind of catalysts screening strategy on Ag_x Cu_100?x nanoalloys is reported, containing the surface modification method, studies of activity enhancement mechanism, and applied research on zinc–air batteries. The results exhibit that the role of selective dealloying (DE) or galvanic displacement (GD) is limited by the “parting limitation”, and this “parting limitation” determines the surface topography, position of d‐band center, and ORR performance of Ag_x Cu_100?x alloys. The GD‐Ag₅₅Cu₄₅ and DE‐Ag₂₅Cu₇₅ catalysts alloys present excellent ORR performance that is comparable to Pt/C‐20%. The relationship between electronic perturbation and specific activity demonstrates that positive shift of the d‐band center (≈0.12 eV, relative to Ag) for GD‐Ag₅₅Cu₄₅ is beneficial for ORR, which is contrary to Pt‐based alloys (negative shift, ≈0.1 eV). Meanwhile, extensive electrochemical and electronic structure characterization indicates that the high work function of GD‐Ag₅₅Cu₄₅ (4.8 eV) is the reason behind their excellent durability for zinc–air batteries.     

场地受限条件下大跨度门式 启闭机安装实例

通过对特定的门式启闭机安装场地条件进行实地考查,列出了场地条件对其安装作业存在的不利因素。在分析研究了由于场地存在的不利因素对门式启闭机安装造成的难题后,有针对性地制定了安装技术措施,从而保证了安装作业过程安全、实施顺利。本文可供类似场地条件的门式启闭机安装施工作业参考。     

3 500 mm精轧机中间轴的修复及改造

本文简述了3 500 mm四辊精轧机主传动装置的结构,重点介绍了中间轴断裂后的修复及改造方案,接轴平衡轴承由胶木瓦改为滚动剖分轴承后,取得了良好效果.     

One‐Pot Synthesis of Dealloyed AuNi Nanodendrite as a Bifunctional Electrocatalyst for Oxygen Reduction and Borohydride Oxidation Reaction

A novel one‐pot approach for synthesizing the dealloyed nanomaterials at room temperature is introduced for the first time. In such a synthetic strategy, applying modulated potentials effectively simplifies the traditional dealloying route, which usually requires additional corrosion process to dissolve nonprecious metals. The dealloyed AuNi nanodendrites (AuNi NDs) with tunable composition and uniformly elemental distribution are well developed by the one‐pot strategy. Impressively, the as‐synthesized AuNi NDs exhibit a higher electrochemically active area and definite improvements in electrocatalytic activity for oxygen reduction reaction (ORR) and borohydride oxidation reaction (BOR) compared to the commercial Pt/C. In particular, the AuNi NDs are 81 mV more positive in half‐wave potential and about 3.1 times higher in specific activity (at 0.85 V) for the ORR than Pt/C, together with excellent stability and methanol tolerance. The superior BOR activity is highly promising compared to the previously reported catalysts. The unique nanodendritic structure with Au‐rich surface and bimetallic electronic effect is the main factor to greatly enhance the bifunctional catalytic performance for the AuNi NDs. Furthermore, such a newly developed facile method is of great significance because it is one of the first examples to effectively engineer dealloyed bimetallic nanostructures via the practical and low‐cost route for electrocatalytic applications.     

氯化浸出镍溶液中钴的分离和回收

本文研究用溶剂萃取法从氯化浸出的氯化镍溶液中分离回收钴的技术。选择Ｎ＿（２３５）（叔胺）－异辛醇　－２６０号煤油萃取体系，离心萃取器做为萃取设备进行了萃取平衡试验、台架试验和半工业试验，得到的ＣｏＣｌ＿２溶液含Ｃｏ＞１２０ｇ／Ｌ，Ｃｏ／Ｎｉ＞１００００，钴收率大于９７％。     

水润湿及潮湿条件下压裂支撑剂破碎率的变化

油田压裂支撑剂(简称陶粒)的破碎率指标是影响压裂裂缝导流能力的关键技术指标.通过大量的对比试验证明,陶粒被水润湿或环境湿度对其破碎率有较大影响.陶粒在水润湿条件下其破碎率比正常样品提高2倍以上,在潮湿条件下其破碎率比正常样品提高1%左右.本实验研究对压裂施工设计、预测裂缝导流能力、压裂支撑剂选择和压裂支撑剂质量检验等有一定的指导意义.     

混凝投药控制技术原理与评价

对近年来发展较快的水处理混凝投药控制技术加以分类评述，指出混凝投药串级控制效果优良，有应用发展前途。     

高放废液玻璃固化工艺冷试验装置的设计和验证试验

设计、安装了一套玻璃固化冷试验装置,作了多轮工艺冷试验,取得了一定的经验。本文介绍了装置的设计参数和工艺冷试验对设备的考验结果。