臭氧氧化法在深度处理难降解有机废水中的应用

臭氧氧化作为一种有效的深度处理技术,对难降解有机废水具有良好的降解功效.介绍了臭氧的性质及氧化机理,分析了臭氧氧化法在处理纺织印染废水、造纸废水、垃圾渗滤液、炼油废水、焦化废水等难降解有机废水中的应用,指出了臭氧氧化存在的问题.     

溶胶-凝胶结合浇注料的实验室研究

溶胶-凝胶耐火材料与原来的耐火材料相比具有许多优点.通过制作溶胶-凝胶结合浇注料试样的实验,对其进行差热分析和电镜检验分析,研究浇注料物化性能,探讨硅铝胶结合剂的实验室开发,对溶胶-凝胶结合技术在耐火材料上的应用得出初步认识.     

循环流化床锅炉耐火耐磨材料的设计与施工

耐火耐磨材料的质量和施工是保证循环流化床(CFB)锅炉可靠运行的关键技术之一.文章介绍了内蒙古华电乌达热电有限公司的480t/h CFB锅炉燃烧系统中各部位的耐火耐磨材料的结构设计、施工与烘炉经验.     

制氢转化炉炉顶衬里结构的改造设计

通过制氢转化炉炉顶衬里结构改造两种设计方案的介绍,说明折叠式耐火陶瓷纤维模块用于转化炉炉顶衬里的优点.     

Fenton氧化技术处理难降解工业有机废水研究进展

系统地分析了各种Fenton氧化技术对有机污染物的降解机理,概述了Fenton氧化技术在处理化工废水、印染废水、制药废水、农药废水和含油废水等难降解工业有机废水中的应用研究进展,认为拓宽Fenton氧化体系的pH响应范围,开展Fe2 /Fe3 固定化技术研究是今后的研究重点,Photo-Fenton和E1ectro-Fenton将是今后Fenton氧化体系的两大发展方向.     

水煤浆加压气化炉托砖板法兰的维修

从高温炉渣及粗煤气的冲蚀、高温粗煤气的腐蚀、高温介质对金属材料的烧蚀等方面分析了水煤浆加压气化炉托砖板法兰损毁的原因;介绍了新更换的托砖板法兰的技术要求、维修过程和改进措施。     

煤焦浆气化炉用耐火材料的选择

采用回转抗渣法进行氧化锆砖、高纯刚玉砖、铬刚玉砖、86高铬砖和90高铬砖等不同材质耐火材料抗石油焦渣侵蚀能力的对比试验,并采用扫描电镜和X衍射等分析方法对侵蚀试验砖的显微结构进行了观察与分析,研究了不同材质耐火材料抗石油焦渣侵蚀能力的差异.结果显示:90高铬砖抗石油焦渣侵蚀能力最好,试验前后厚度几乎无变化;氧化锆砖最差,侵蚀厚度达14 mm;不同材质耐火材料抗侵蚀性能优劣的顺序为:90铬砖>85铬砖>铬刚玉砖>刚玉砖>氧化锆砖.     

Study of the refractory used in a submerged arc furnace in the copper-making industry

A cost driver in the copper-making industry is the periodical relining of the furnaces because of wear. This paper presents thermochemical calculations (using the FactSage^™ database) focused on the evaluation of the slag-refractory chemical interaction in a submerged arc furnace (SAF) used for slag-cleaning operations. This evaluation was made under different conditions: slag-refractory volume ratio, oxygen partial pressure, and different types of slag. The new phases formed as a consequence of the slag-refractory chemical interaction were identified and quantified. To support the theoretical calculations based on thermochemistry, a postmortem study was carried out on a SAF used at the Atlantic Copper Smelter (Spain) after a 6-year campaign (4.5 mill. t. slag processed). Refractory samples were taken from different locations on the wall and analyzed using a scanning electron microscope equipped with an Energy Dispersive Spectroscopy system.     

Evaluation of alumina reinforced oil fly ash composites prepared by spark plasma sintering

The thermomechanical behavior of micro/nano-alumina (Al₂O₃) ceramics reinforced with 1-5 wt.% of acid-treated oil fly ash (OFA) was investigated. Composites were sintered using spark plasma sintering (SPS) technique at a temperature of 1400°C by applying a constant uniaxial pressure of 50 MPa. It was evaluated that the fracture toughness of micro- and nanosized composites improved in contrast with the monolithic alumina. Highest fracture toughness value of 4.85 MPam^1/2 was measured for the nanosized composite reinforced with 5 wt.% OFA. The thermal conductivity of the composites (nano-/microsized) decreased with the increase in temperature. However, the addition of OFA (1-5 wt.%) in nanosized alumina enhanced the thermal conductivity at an evaluated temperature. Furthermore, a minimum thermal expansion value of 6.17 ppm*K⁻¹ was measured for nanosized Al₂O₃/5 wt.% OFA composite. Microstructural characterization of Al₂O₃-OFA composites was done by x-ray diffraction and Raman spectroscopy. Oil fly ash particles were seen to be well dispersed within the alumina matrix. Moreover, the comparative analysis of the nano-/microsized Al₂O₃/OFA composites shows that the mechanical and thermal properties were improved in nanosized alumina composites.     

透水砖防堵技术研究与展望

透水砖的铺设能有效地降低城市的洪涝风险,是海绵城市建设的重要环节.透水砖在使用过程中,因雨水径流中颗粒物的累积效应,导致透水性能降低,使用寿命缩短.笔者综述了透水砖的孔隙结构、堵塞机理以及透水砖的防堵塞技术.透水砖的表面和内部孔隙因截留雨水径流中的颗粒物而产生堵塞,堵塞位置和程度受透水砖孔隙结构、雨水径流颗粒物性质及流...