D-(+)-葡萄糖缩氨基硫脲与铁(Ⅲ)的显色反应及其应用

研究了新试剂D-( )-葡萄糖缩氨基硫脲(HL)与Fe(Ⅲ)的显色反应,在pH 4.2~5.9的HAc-NaAc缓冲体系中,Fe(Ⅲ)与HL形成一种稳定的摩尔比为1∶2的水溶性络合物,其最大吸收波长位于299.1 nm处,表观摩尔吸光系数为6.20×104。25 mL溶液中,Fe(Ⅲ)量在0.2~16.0μg范围内服从比尔定律,该法应用于铝合金和猪毛中微量铁的测定,获得满意结果。     

铸铁机改造实践

按北营钢铁(集团)公司炼铁系统异地改造的要求,针对北营公司现有两台铸铁机存在问题,对铸铁机生产能力、驱动功率校核、平面布置、铁水罐倾翻装置、拉铁小车、机后铁块冷却方式等进行了改进设计,并实施了搬迁改造。     

The effects of glycol methacrylate as a dehydrating agent on the dimensional changes of liver tissue

The dimensional changes of liver sections during the course of processing with glycol methacrylate (GMA) or with ethanol are described. Tissue processing with ethanol served as a control. During prolonged processing steps (24 h each), linear shrinkage of tissue specimens dehydrated with GMA at room temperature was 13.2%. Subsequent infiltration with GMA resulted in trivial swelling, and polymerization in slight shrinkage (2.3%). In comparison, processing with cold GMA resulted in shrinkage during dehydration (about 10.8%), a slight swelling in pure GMA, followed by shrinkage during polymerization (2.2%). Short routine processing schedules resulted in similar shrinkage/swelling patterns, although precise values differed slightly. In all experiments, ethanolic dehydration resulted in smaller dimensional tissue changes than did GMA dehydration. The dimensional changes of tissue sections during stretching on water, mounting and drying compensated for the major part of the shrinkage manifested during processing.     

电子清管器发射机系统的改进设计

现有的以555芯片产生间断超低频（23Hz左右）电磁脉冲的电子清管器发射机系统会带来频率漂移、各组振荡问的相位关系随机不恒定及静态功耗偏大的问题。为此利用89c2051编程产生间断的超低频脉冲信号,解决了频率漂移及振荡间的相位关系随机的问题。通过采取配置合适的晶振和电源电压措施,并在软件设计部分充分利用单片机休眠模式的低功耗特性,解决了功耗问题。经测试频率稳定在（233-0．01）Hz,振荡间的相位关系恒定。有效工作时间由60h提高至100h。     

电感耦合等离子体原子发射光谱法同时测定生铁中硅锰磷砷锑锡

本文研究了电感耦合等离子体原子发射光谱法(ICP-OES)同时测定生铁中常量元素磷、锰、硅及痕量元素砷、锑、锡。用盐酸-硝酸混合酸溶解试样,选择了各元素的合适分析谱线,在最佳工作条件下,测得磷、锰、硅、砷、锑、锡的检出限分别为0.0042%、0.0003%、0.0009%、0.0024%、0.0033%、0.0021%,相对标准偏差(n=10):常量元素磷、锰、硅及痕量元素砷的RSD小于2%,痕量元素锑和锡的RSD小于10%。本方法用标准物质进行测定,测定结果与认定值吻合。     

近年来济钢炼铁系统的技术进步

面对钢铁行业严峻的市场形势,济钢以铁前系统结构优化、降低生铁成本为核心,围绕经济料生产模式开发出了低品质矿烧结及高炉综合冶炼技术.同时,通过优化烧结燃料结构,降低固体燃耗;优化烧结熔剂结构,减少高炉辅料用量;以及生产酸性烧结矿等措施,大大降低了生铁成本,获得了较好的经济效益.     

电解铝生产中优化磷生铁配方的试验研究

针对240kA铝电解槽阳极组的钢爪和碳块之间浇注压降高低不等，造成生产中设备附加电阻大，浪费电能的状况，通过设计正交试验，优化磷生铁配方，降低了浇注压降，节能效果显著。     

X射线荧光光谱法测定生铁中的次量元素

采用玻璃熔片法制样，用ZSX100e型X射线荧光光谱仪测定生铁中的次量元素Si、Mn、P、V、Ti、Cu、Cr。其分析结果的精密度和准确度不低于化学法。     

Characteristics of Metal Droplets in Slag Tapped from the Blast Furnace

Slag samples, hot‐metal samples and hot‐metal temperatures were obtained during tapping of two blast furnaces. Sampling was carried out at different time points during tapping of three separate heats. The size distribution and composition of metal droplets found in the slag were determined using scanning electron microscopy. Only metal droplets above 0.75 μm could be counted and analysed. All droplets were below 8 μm in diameter and the great majority of these droplets were found to be between 0.75 and 2 μm. The size distribution did not differ significantly for different slag samples. Iron was the main droplet component. Electron probe microanalysis showed that the droplets contained small amounts of carbon. The percentage of the area in a studied cross‐section that was covered with metal droplets varied between 0.01 and 0.07%. Calculations based on Stoke's law showed that the distance droplets travel in the slag is in the micron range. Slag samples taken in the beginning of slag tapping contained more droplets than those taken in the middle of slag tapping, an indication that most droplets can be found in the area near the furnace wall. Some droplets were determined to have magnesium enrichment at the external surface.     

阳极组装工序对预焙阳极质量影响及控制措施探讨

本文从炭阳极组装车间质量控制的要素,分析阳极炭块中灰分、磷生铁产生的原因及控制方法,通过对阳极组装车间的设备改造,有效的清除软残极及组装块表面的磷生铁,减少杂质对电解及成型的影响,提高电解铝铝液的质量。