铸铁用石灰基复合脱硫的研究和发展

论述了国内外近年来铸铁熔炼用石灰基复合脱硫剂的研究现状。介绍了有关改善ＣａＯ和铁液反应界面气氛和界面性状，提高石灰脱硫效果的研究和运用，分析了各种添加物质改善ＣａＯ脱硫的作用机理；展示了石灰基复合脱硫剂的良好发展前景。     

LF钢包脱硫试验

选择含氧化铝的石灰基固体粒状脱硫剂在，ＥＡＦ（ＥＢＴ）出钢过程和ＬＦ炉内进行了１０炉次钢液脱硫试验。结果表明，通过调整脱硫剂成分，使终渣获得适当碱度和高的硫分配比，可取得稳定和良好的脱硫效果。     

铸铁用石灰基复合脱硫剂的研究和发展

论述了国内外近年来铸铁熔炼用石灰基复合脱硫剂的研究现状。介绍了有关改善CaO和铁液反应界面气氛和界面性状，提高石灰脱硫效果的研究和运用；分析了各种添加物质改善CaO脱硫的作用机理；展示了石灰基复合脱硫剂的良好发展前景。     

无氟环保型KR脱硫剂的研究与应用

无氟环保脱硫剂对于环境和氟资源保护有重要意义,通过对铁水脱硫机理进行了计算分析,得出采用Al₂O₃微粉替代萤石作为KR铁水脱硫的助熔剂能够促进助熔作用的同时,降低铁水氧活度、提高反应温度。通过熔点及工艺研究获得最优无氟脱硫剂配比为15:85。工业试验结果表明,在脱硫剂中加入一定量的Al₂O₃有利于加快脱硫反应的速度,降低石灰的熔点,增加脱硫剂的脱硫率,提高石灰颗粒的利用率。无氟脱硫剂平均消耗量降低0.3 kg/t以上,平均终点硫质量分数为0.003 1%,脱硫率提高为86.13%,满足铁水脱硫任务的需求,实现了无氟脱硫剂的完全替代。     

微粉脱硫剂的开发

浦钢电炉厂使用的石灰基炉外脱硫剂，经气流粉碎机破碎后能达到微米级粒度要求。所制微粉脱硫剂在小坩埚中的脱硫率达70％，钢水含硫0．01％。经适当包装的微粉脱硫剂14－21天吸水率＜2％，不发生团聚现象。     

铁水复合脱硫剂的研究及应用

硫是铸铁中的常存元素，它阻碍铸铁所有结晶阶段的石墨化。在球墨铸铁中，它增加球化剂的消耗并易使铸件产生夹渣、皮下气孔及球化衰退等缺陷。因此，降低硫含量对生产球铁至为重要。我厂的斯达一斯太尔球铁车间，采用冲天炉一电炉双联熔炼，中间采用摇动包脱硫，使用自制的电石及购买的防潮Cao粉，脱硫效果不理想，且成本高，污染大。为此，我们研究了一种脱硫效果较高、污染低、安全性好的脱硫剂。一、复合脱硫剂铁水脱硫剂种类很多，传统的炉外脱硫剂是苏打、电石和石灰。由于这些物质使用时存在各种不足，从而限制了这些物质的推广应用…     

铁水KR法用石灰基脱硫剂低氟化实验研究

向石灰和萤石不同比例的脱硫剂中添加氧化铝进行铁水脱硫实验,研究了萤石含量和氧化铝含量对石灰基脱硫剂铁水脱硫的影响规律。结果表明,改变脱硫剂中萤石的含量影响脱硫剂的脱硫效果;通过改变萤石含量而改变脱硫效率。在石灰基脱硫剂中加入氧化铝可加快脱硫过程,提高石灰的利用率;当石灰基脱硫剂中添加10.0%的氧化铝时,在降低脱硫剂的情况下脱硫效率稍微增加。     

新型添加剂对电解铝用磷生铁脱硫增碳效果的影响

采用石灰系脱硫剂与石墨增碳剂对电解铝用磷生铁进行脱硫增碳处理,以降低磷生铁中的硫含量,增高磷生铁中的碳含量。结果表明,石墨增碳剂在粒度为10 mm,采用在添炉时与炉料分层添加的方法增碳效果达到最佳:碳含量由1.85%增加到2.98%。石灰系脱硫剂中碳化钙、碳酸钙和氧化钙的比例为2∶2∶3的比例混合使用时,脱硫效果达到最佳状态:硫含量由0.698%降低到0.265%,且铁渣由酸性渣转变为碱性渣,拔渣过程中不再有拉丝现象,渣铁分离良好。     

高炉渣铁的脱硫试验

对w(S)量高、w(Si)和w(Mn)量低的高炉渣铁进行脱硫试验,结果显示:渣铁温度控制在1420～1460℃,加入3%的脱硫剂(成分为85%石灰+10%萤石+5%石墨),脱硫时间为10min时,脱硫效果达到最佳。用该工艺生产普通灰铸铁件,试样的基体组织为珠光体+铁素体,抗拉强度为195MPa,布氏硬度为223HB,满足低牌号灰铸铁的性能要求。     

铸铁熔炼脱硫用石灰基复合脱硫剂的研究

研究以石灰为基的二元、三元、四元铸铁熔炼用复合肿硫剂，并对复合脱硫剂的复合方式进行了探讨。结果表明：采用烧结方式的CaO85-CaF25-CaCo3 5-C5 t CO85-CN2SF6东5－CCO3工5-C5四元石灰基复合脱硫效果最好，脱硫率可达80％以上，且不会发生回硫现象，完全能满足铸铁脱硫的需要。     

油母页岩干馏气干湿结合法脱硫技术的应用

本文介绍了应用干法脱硫与湿法脱硫相结合的方式对油页岩炼油干馏气进行脱硫的工艺原理和流程。该技术使抚顺矿业集团200万t原页岩E部炼油工程干馏气中H2S含量从脱硫前的3 700 mg/Nm3降至20 mg/Nm3,达到了发电机组对干馏气体中H2 S含量的要求,每年可减少SO2排放4 000 t,获得了较好的社会和经济综合效益。     

MFuBSPP光度法测定钯

５，１０，１５－三（４－甲基－３－磺基苯）－２０－〔４－（５－氟尿嘧啶）丁氧基－３－磺基苯）卟啉（ＭＦｕＢＳＰＰ）是一种新的不对称性的卟啉显色剂。利用ＭＦｕＢＳＰＰ对钯的显色条件进行了研究，发现在ｐＨ４．８的醋酸一醋酸钠缓冲介质中，有抗坏血酸存在，Ｐｄ（Ⅱ）与ＭＦｕＢＳＰＰ形成灵敏度很高的１：１配合物，最大吸收波长为４１４ｎｍ，配合物的摩尔吸光系数ε＝１．５×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１，     

一种适用于蒸压反应釜的电弧喷涂专用封闭剂

以2127酚醛树脂为原料,研制了适合建材行业反应釜的电弧喷涂专用封闭剂,测试了介质对涂层的渗透性能,结果表明,该种封闭剂完全能适应反应釜的工作环境.     

镍铁精炼过程中的脱硫机理研究

为了降低镍铁中的硫含量,采用喷吹精炼工艺进行脱硫。通过热力学计算了氧与硫的平衡活度,分析了影响脱硫的因素,探讨了常用脱硫剂的脱硫热力学反应机理,从而提高了脱硫能力。通过对常用脱硫剂CaO、CaC2、Mg、Mg/CaO脱硫的热力学分析可知,常用脱硫剂都可以降低镍铁中的硫活度,将镍铁中的硫含量降低到要求范围之内。但Mg/CaO混合脱硫的效果最好。     

Results of testing various natural gas desulfurization adsorbents

This article presents the results of testing many commercially available and some experimental sulfur adsorbents. The desired result of our testing was to find an effective method to reduce the quantity of sulfur in natural gas to less than 100 ppb volume (0.1 ppm volume). An amount of 100 ppb sulfur is the maximum limit permitted for Siemens Westinghouse solid oxide fuel cells (SOFCs). The tested adsorbents include some that rely only on physical adsorption such as activated carbon, some that rely on chemisorption such as heated zinc oxide, and some that may use both processes. The testing was performed on an engineering scale with beds larger than those used for typical laboratory tests. All tests were done at about 3.45 barg (50 psig). The natural gas used for testing was from the local pipeline in Pittsburgh and averaged 6 ppm volume total sulfur. The primary sulfur species were dimethyl sulfide (DMS), isopropyl mercaptan, tertiary butyl mercaptan, and tetrahydrothiophene. Some tests required several months to achieve a sulfur breakthrough of the bed. It was found that DMS always came through a desulfurizer bed first, independent of adsorption process. Since the breakthrough of DMS always exceeds the 100 ppb SOFC sulfur limit before other sulfurs were detected, an index was created to rate the adsorbents in units of ppm DMS × absorbent bed volume. This index is useful for calculating the expected adsorbent bed lifetime before sulfur breakthrough when the inlet natural gas DMS content is known. The adsorbents that are included in these reports were obtained from suppliers in the United States, the Netherlands, Japan, and England. Three activated carbons from different suppliers were found to have identical performance in removing DMS. One of these activated carbons was operated at four different space velocities and again showed the same performance. When using activated carbon as the basis of comparison for other adsorbents, three high-performance adsorbents were found that removed about 100 to 150 times as much DMS as activated carbon before breakthrough. This paper was presented at the Fuel Cells: Materials, Processing, and Manufacturing Technologies Symposium sponsored by the Energy/Utilities Industrial Sector & Ground Transportation Industrial Sector and the Specialty Materials Critical Technologies Sector at the ASM International Materials Solutions Conference, October 13–15, 2003, in Pittsburgh, PA. The symposium was organized by P. Singh, Pacific Northwest National Laboratory, S.C. Deevi, Philip Morris USA, T. Armstrong, Oak Ridge National Laboratory, and T. Dubois, U.S. Army CECOM.     

KINETIC MODEL FOR POWDER INJECTION DESULFURIZATION

1. Introduction In recent years, powder-injection refining in hot metal pretreatment has made significant progress, and the analysis and modeling of powder-injection processes in hot metal pretreatment are of great interest. At present, the Mg-based flux is increasingly used in hot metal desulfurization, and CaO-based flux is often used in fields of simultaneous dephosphorization and desulfurizaion. As a result, studies of the reaction mechanisms during hot metal desulfurization using CaO-ba…     

1,10—二氮菲在分析化学中的实际应用

介绍了1,10-二氮菲(phen)及其金属络合物的分析化学性质,评述了我国80年代以来,该试剂在分析化学中的实际应用和发展前景。     

Properties of sulfur sorbents containing dispersed nickel in an Al2O3 matrix

For advanced coal gasification systems, regenerable sorbents are being developed to remove sulfur (S) from the hot product gas prior to its use in gas turbines and high-temperature fuel cells. Whereas zinc (Zn) base sorbents are attractive for these applications, they have limitations in high-temperature capability and in durability. Materials containing dispersed nickel (Ni) in an Al₂O₃ matrix have the potential to be better in both respects. Their main limitation is that they do not reduce H₂S concentrations to the low parts per million (ppm) level. Results are reported here on the second phase of a program on dispersed Ni sorbents. Included are the results of crush strength, thermogravimetric analysis, and fixed-bed reactor experiments. An important conclusion drawn from the results is that chemisorption of H₂S plays a major role in reducing its concentration in gas exiting the bed below the levels expected from the Ni-Ni sulfide equilibrium.     

冲天炉内喷粉强化及脱硫

在冲天炉风口中喷入燃料和脱硫剂的混合粉,对冲天炉熔炼过程有显著的强化作用和铁水、烟气脱硫作用.喷入还原带的燃料粉,促进了CO的链式燃烧反应,提高炉气燃烧比,从而提高铁水温度和熔化率或降低焦耗量;悬浮在炉气中的脱硫剂粉与炉气、铁水滴大范围、长时间接触,可充分发挥其对炉气和铁水的脱硫作用.本文分析了强化熔炼和脱硫的机理,阐述了喷粉工艺要点,介绍了喷粉装置的结构类型和实验效果.     

煤气脱硫工艺简述

介绍了国内外煤气脱硫的各种生产工艺,并对不同的生产工艺进行了对比。