碳中和背景下的钢化联产发展趋势

本工作针对钢铁行业副产的煤气、余热、钢渣及钢化联产现状进行了分析,论述了碳中和背景下钢化联产绿色低碳技术的发展趋势,展望了未来无碳炼钢的新型钢厂从“以化固碳”转变为“以氢代碳”的新模式,并提出了加快钢化联产新技术应用建议和举措,以期建立以钢铁行业为龙头,耦合化工行业的新型工业可持续发展生态链,支撑我国“双碳”目标的实现。要点：(1)钢铁副产煤气、余热、钢渣利用现状。(2)钢化联产技术现状与发展趋势。(3)未来新型钢厂钢化联产技术。(4)钢化联产发展构想与建议。     

玄武岩纤维和钢纤维含量对树脂基摩擦材料性能的影响研究

以酚醛树脂、丁腈橡胶、重晶石、玄武岩纤维和钢纤维等为原料进行摩擦材料的制备,研究了玄武岩纤维和钢纤维含量对摩擦材料力学性能和摩擦磨损性能的影响.结果表明,当玄武岩纤维含量为10％～25％(质量分数,下同)时,随着纤维含量的减少,摩擦材料的冲击强度增大、压缩强度减小;当纤维总量占30％且玄武岩纤维与钢纤维质量比为1:1时...     

阀门硬化处理工艺对蒽醌法生产双氧水的影响

目前国内阀门硬化通常采用渗氮处理,渗氮工艺具有增强阀门使用寿命,提高阀门轴套耐磨性等优点。但采用渗氮工艺处理之后,继续进行酸洗钝化处理后的阀门在蒽醌法生产双氧水工艺中的应用研究较少。为了增加这一方向的研究,论文介绍了对阀杆和轴套表面进行渗氮处理的几种方法,如离子渗氮、射频渗氮、微波渗氮、离子注入和离子湮没注入的方法增加阀杆和轴套的使用寿命和耐磨性。通过对奥氏体不锈钢三偏心异径蝶阀阀杆轴套进行渗氮处理后整体酸洗,酸洗后拆检并采用双氧水进行浸泡,对不同浸泡时间的双氧水进行浓度、稳定度和铁离子的测定,根据实验结果得出渗氮工艺处理过的阀门经过酸洗后,表面会含有大量铁离子,这些铁离子的存在会导致双氧水分解,降低双氧水的浓度和稳定度,因此不适合在蒽醌法生产双氧水中应用。而仅进行酸洗钝化处理的阀门,对于双氧水影响较小,在蒽醌法生产双氧水中应用较为合适。     

Synthesis of SBA 15 graphene oxide composite membrane using phenol–formaldehyde resin pore modifier for CO2 separation

Present study highlights the development of carbon-loaded SBA 15 membrane on clay-alumina tubular support and its performance on the CO₂ separation efficiencies from different mixture gases. To modify the large pores of SBA 15 by graphitic carbon, low molecular weight phenol–formaldehyde (PF) resin was incorporated into the mesoporous channel followed by calcination under inert atmosphere. The modified ordered pore structure of the membrane has been characterized by low-angle XRD, TEM, and pore size distribution analysis. The chemical state of the deposited carbon phase into the SBA 15 pores was analyzed by X-ray photoelectron and Raman spectroscopy. Carbon having graphitic nature mainly in graphene oxide has been deposited into the mesopore of SBA 15 resulting decrease in pore size from 8.9 to 1.0 nm. Finally, the developed SBA 15 carbon membranes were characterized by CO₂ permeation and separation selectivity of CO₂/CH₄, CO₂/CO. Highest CO₂/CH₄ separation factor was achieved as 16.9 with CO₂ permeance 13.6 × 10^–8 mol/m²/s/Pa at 200 kPa feed pressure by the 20% resin with 2 times coated membrane. In flue gas analysis, highest CO₂/CO separation factor of 32.8 was achieved. This study offers an observation on CO₂ separation from simulated BF gas for the first time and the results show the potential of the developed SBA 15/C composite membranes in commercial application.     

In-situ synthesis of 15R-Sialon from Al-Si3N4-Al2O3 composite at 1500°C via liquid-phase sintering

In this study, alumina-based composite with 12 wt% Al and 16 wt% Si₃N₄ was designed to achieve the synthesis of 15R-Sialon reinforced alumina composite. To investigate the reaction mechanism, two-step sintered Al-Si₃N₄-Al₂O₃ samples at different temperatures ranging from 600°C to 1500°C were prepared and characterized via X-ray diffraction and scanning electron microscope (SEM). The results revealed that 15R-Sialon was synthesized at 1500°C through a novel liquid Si phase sintering and Si₃N₄ played as a precursor and a reactant. First, Si₃N₄ precursor reacted with Al to form intermediate phases AlN and Si, which were not further transformed below 1400°C. When the sintering temperature was 1500°C, the formed Si presented as a liquid phase, under the influence of which plate-like15R-Sialon was generated from Al₂O₃, residual Si₃N₄, and derived AlN. The obtained Si was also involved in the synthesis of 15R-Sialon and completely transformed. In addition to the AlN from Si₃N₄, the AlN deriving from the nitridation of Al may not react with liquid Si. Compared to 15R-Sialon from liquid Si, plate-like 15R-Sialon with smaller size was generated from AlN, SiO, and O₂.     

Investigation on the inhibition effect of aspartic acid and Zn2+ ions on carbon steel surface in aqueous solution

A protective film has been formed on the surface of carbon steel in aqueous environment using a synergistic mixture of an environment-friendly inhibitor, aspartic acid, and Zn²⁺. The synergistic effect of aspartic acid (AS) in controlling corrosion of carbon steel has been investigated by gravimetric studies in the presence of Zn²⁺. The formulation consisting of AS and Zn²⁺ has an excellent inhibition efficiency. The results of potentiodynamic polarization revealed that the formulations are of mixed-type inhibitor. Impedance studies of the metal/solution interface indicated that the surface film is highly protective against the corrosion of carbon steel in the aqueous environment. X-ray photoelectron spectroscopic analysis of the protective film showed the presence of the elements iron, nitrogen, oxygen, carbon, and zinc. The spectra of these elements in the surface film showed the presence of oxides/hydroxides of iron(III), Zn(OH)₂, and [Fe(III)/Fe(II)–Zn(II)-AS] complex. Further, surface characterization techniques such as Fourier transform infrared spectroscopy, scanning electron microscopy, and atomic force microscopy are used to ascertain the nature of the protective film formed on the carbon steel surface.     

Development of a creep‐free stress‐strain law for fire analysis of steel structures

This paper presents a practical procedure for obtaining creep‐free stress‐strain laws for steel exposed to fire, on the basis of codified stress‐strain laws that consider creep implicitly. The applicability of the proposed procedure has been tested on two commonly used stress‐strain laws for steel at elevated temperature, the Eurocode 3 law and a Ramberg–Osgood model, both of which have implicit consideration of creep. The simulation of two published steel coupon experiments on steel of grades S275 and S355 shows that both the Eurocode and Ramberg–Osgood stress‐strain laws produce inaccurate predictions of creep in fire at elevated temperatures. The proposed procedure was thereby used to extract the implicit creep according to the heating rates of the transient coupon tests and to derive the creep‐free stress‐strain laws. It has been shown that, by combining the creep‐free stress strain law obtained by the proposed methodology with an explicit creep model, a more realistic prediction of steel behaviour in the selected coupon test studies can be achieved. Copyright © 2015 John Wiley & Sons, Ltd.     

富马酰基桥联双冠醚的晶体结构及其对金属离子的选择键合

通过母体冠醚环(苯并氮杂-15-冠-5)与富马酰氯反应,合成了一种新型的富马酰基桥连的双冠醚,其单晶结构经X-射线单晶衍射仪测定;继而采用溶剂萃取法考察了其对金属离子(Li~+、Na~+、K~+、Rb~+、Cs~+、Ag~+、Tl~+)的识别能力。结果显示,该双冠醚对Li~+具有较高的萃取率和选择性。     

球磨双闭路工艺生产超细钢渣微粉的实践

2014年JTC公司投产建成一条处理80万t/a钢渣微粉生产线,原料为当地炼钢厂外排的一种转炉钢渣。为节省投资,经多方论证,该公司利用原有的两台球磨机组成了分段粉磨、过程分选和精粉回路除铁的双闭路粉磨工艺。该项目已取得成功实践,为钢渣的资源化利用找到了一条切实可行的方法。     

港珠澳大桥FRP桥梁防撞护舷船碰撞数值模拟及结构设计

针对港珠澳大桥建设项目,对大桥防撞护舷系统技术指标进行了验证,并进行船舶碰撞有限元数值模拟,旨在对防撞护舷系统的安全性及结构设计的合理性进行评估,通过有限元分析软件ANSYS/LS-DYNA对船只碰撞防撞护舷进行非线性模拟仿真,得到计算工况下的碰撞能量和碰撞力时程曲线,同时对复合材料防撞护舷的结构设计和材料选用也进行了分析工作。