不锈钢管常温酸洗槽的防腐蚀施工

不锈钢管混酸(HNO3 HF)酸洗介质的腐蚀性很强, 对耐蚀材料和施工质量要求较高.本文介绍了酸洗槽的防腐蚀施工,在混酸介质条件下的材料选择、防腐蚀设计、基层处理、配料和玻璃钢施工,针对防腐蚀施工中出现的技术问题进行了分析和解决.     

冷冻机蒸发器结垢现象的分析与处理

介绍空分设备空气预冷系统低温水泵流量降低,电机温度和膨胀阀开度增加的故障现象,通过对运行参数的对比分析和前期处理,判断故障由冷冻机蒸发器铜管被结晶物堵塞导致换热效果降低引起,对蒸发器进行封闭、循环酸洗,消除了故障。     

酸洗槽的防护处理

采用复合衬里结构对酸洗槽进行防护,介绍了施工方法。     

Hydrothermal synthesis of TiO2 nanosheets photoelectrocatalyst on Ti mesh for degradation of norfloxacin: Influence of pickling agents

TiO₂ nanosheets (TiO₂-NSs) photoanodes were synthesized on the surface of Ti meshes via the hydrothermal method, and then washed by HCl, HNO₃ and H₃PO₄, respectively. The TiO₂-NSs washed by different pickling agents were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electrons microscopy (SEM), and UV–vis diffuse reflectance spectra (DRS). The results showed that P and N were transferred into the lattice of TiO₂. The TiO₂-NSs samples washed by HCl and HNO₃ both had a mixture of anatase and rutile structures, while the TiO₂-NSs washed by H₃PO₄ only contained anatase phase. It could be concluded that H₃PO₄ pickling inhibited the formation of rutile phase. Moreover, TiO₂-NSs washed by HNO₃ (TiO₂-NSs-HNO₃) exhibited the strongest light absorption ability in visible region. Photoelectrochemical properties of the TiO₂-NSs photoelectrodes washed by different agents were investigated via transient photocurrent response (TPR), open-circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). The photocatalytic (PC) and photoelectrocatalytic (PEC) performances were evaluated by the degradation of norfloxacin and the yield of •OH radicals in the reactors. The results showed that the TiO₂-NSs-HNO₃ photoelectrode revealed the highest photoinduced current of 1.08 mA/cm², open-circuit photovoltage of −0.22 V, PEC efficiency of 93% for the removal of norfloxacin. In addition, the enhanced PEC mechanism for TiO₂-NSs-HNO₃ was proposed. The high PEC activity of TiO₂-NSs-HNO₃ could be attributed to the introduction of N during acid-washing procedure, which could not only reduce the band gap energy but also accelerate the separation and transportation of photogenerated charge carriers.     

消除冷轧带钢停车斑的措施

针对热轧带钢停车斑的质量缺陷，分析了停车斑产生的原因，提出了新增倒车系统消除停车斑的改造方案，解决了酸轧联合机组长期难以解决的产品质量问题。     

酸再生机组焙烧炉进料管道的改进

分析冷轧厂酸洗废液再生机组焙烧炉进料管道酸垢的成因,介绍实施的增设冲洗管路、改进系统控制程序等措施及其效果。     

酸洗连轧线废酸回收装置改造

针对马钢酸洗连轧线酸雾抽排系统排酸浓度高和废酸坑中废水酸性偏高的问题,增加了自动回收装置,减少了新酸、石灰和块碱的消耗。     

Flash fixation of heavy metals from two industrial wastes into ferrite by microwave hydrothermal co-treatment

Flash fixation of heavy metals from electroplating wastewater (EPW) and pickling waste liquor (PWL) into ferrite lattice can be investigated by microwave hydrothermal process. The toxicity of wastewater may be reduced by the redox reaction between Cr(VI) in electroplating wastewater and Fe(II) in pickling waste liquor. Box-Behnken design (BBD) experiment gives optimal process condition of ferrite formation as follows: wastewater volume ratio (V_PWL:V_EPW = 0.20), pH value 11 and retention time 15 min, on which formed ferrite has a soft magnetic property with high saturation magnetization (M_s) 47.4 emu/g. The rapid ferrite process has lower activation energy 7.01 kJ/mol according to grain growth kinetics. Concerning the environmental and economy, we introduced a new and interesting method for water remediation simultaneously synthesizing ferrite by using microwave mediated hydrothermal processes.     

缓蚀剂的研究现状及其应用：第二讲酸洗缓蚀剂的研究及其应用

我国酸洗缓蚀剂的研究和应用发展迅猛，某些酸洗缓蚀剂性能达到国际先进水平，缓蚀剂机理和测试方法的进展促进凝蚀剂新产品的开发以满足工业的需求，我国缓蚀研究的一大特点是化工，医药副产品和植物中提取缓蚀剂，高效，低毒，价廉的缓蚀剂研制是今后酸蚀剂研究的发展方向。     

Failure analysis of IEU drill pipe wash out

Many 127.0×9.19 mm IEU G105 drill pipe failures of wash out occurred after 2367 h of pure drilling time and 8726 m of penetration footage. This paper gives a detailed investigation on these failures and a systematic analysis is carried out on service and loading conditions of the drill pipes. Measurement and inspection were performed on configuration dimensions, chemical composition, mechanical performance, metallography, macro-fractography, micro-fractography, and corrosion products. Configuration stresses at the crack positions of the drill pipe were calculated by FEA. Crack extending velocity of the drill pipe material under corrosion medium was also measured. It is thought from test and analysis results that the drill pipe wash out or fracture accidents were premature corrosion fatigue failure accident. The failure courses were as the following: corrosion pits occurred first on the internal surface at the stress concentrating area of the drill pipe, and then fatigue cracks initiated in pit bottoms, and washed out or fractured subsequently as cracks penetrated through the wall thickness of the drill pipe. The reasons of drill pipe wash out were related to configuration, material quality, and load condition of the drill pipe string.