济钢3200m~3高炉高铝矿条件下的低硅冶炼

在介绍3 200 m3高炉炉料结构及其配料中的高Al2O3来源、高铝矿对高炉冶炼的要求及降低生铁硅含量意义的基础上,重点介绍降低生铁硅含量在3 200 m3高炉的生产实践。在生产实践中,济钢炼铁厂根据渣中的Al2O3主要来自高铝烧结的现状,对3 200 m3高炉加强原燃料质量管理,优化高炉操作制度,重点加强对风口前理论燃烧温度、渣中Mg O含量及布料制度的管理,实施低硅高热的低硅冶炼模式,实现了生铁w(Si)0.4%的目标。     

济钢高炉强动力冶炼技术的应用

为应对经济料冶炼造成的入炉综合品位低、渣比高、渣中Al2O3含量高等导致的高炉透气透液性差、炉渣黏度大等操作难题,济钢高炉(1 750 m3、3 200 m3)采取强动力冶炼技术,即通过加长风口长度、缩小进风面积等方法提高鼓风动能从而提升炉缸活性,并通过布料制度、热制度及造渣制度的改善,提高终渣性能,从而实现了高炉长期稳定顺行,产量提高,生铁含Si下降,燃料比降低20 kg/t以上。     

济钢1750m~3高炉高Al_2O_3高渣比条件下的低硅冶炼

介绍了济钢针对1750 m3高炉在高Al2O3、高渣比的不利条件下所采取的相应措施及效果。通过加强对炉料的管理,优化高炉操作制度,创新炉况管理方式等优化措施,实现了生铁含[Si]量控制在0.4%以下,取得了显著的成效。     

高炉炼铁工艺中Al2O3的影响及适宜w(MgO)/w(Al2O3)的探讨

 高Al2O3铁矿石使用量的增加导致高炉炉渣Al2O3含量大幅度攀升。针对高Al2O3铁矿的高炉冶炼,定量综述了Al2O3对烧结工艺、烧结矿冶金性能、高炉冶炼产生的负面影响,分析了中国高Al2O3的高炉冶炼现状以及高Al2O3渣高炉冶炼应采取的措施,重点探讨了高炉炉渣适宜的w(MgO)/w( Al2O3)比。     

济钢3200m~3高炉渣系变化对炉况的影响分析

通过回归分析济钢3 200 m3高炉开炉以来炉况正常情况下的操作数据,找出了高炉渣比、渣中Al2O3含量、渣中MgO含量、二元碱度对高炉透气性、脱硫效率以及炉缸热储备水平的影响规律,指出在炉渣Al2O3及S负荷均较高情况下,将渣中MgO控制在10%~10.5%,二元碱度R2控制在1.15~1.2之间,可改善高炉透气性,促进高炉顺行和指标进步。     

高铝渣对济钢3200m~3高炉冶炼的影响

针对高铝渣特有的黏度高、流动性差、脱硫能力差的特点,济钢3200 m3高炉通过调整热制度和布料制度,在烧结时提高MgO含量,控制渣中镁铝比0.6,使渣中MgO含量在8%~11%,高炉的整体操作炉型适应了高铝渣的冶炼要求。在渣铁比升高43 kg/t的条件下,高炉生铁含硅降低,炉渣脱硫能力增强,基本杜绝了三类铁。     

高炉高Al2O3炉渣冶炼综合分析

高A12O3 矿的配加及精料技术的进步等因素促使高炉渣中A12O3 含量过高,从而使炉渣熔点和熔化性温度升高,流动性和脱硫能力下降.高炉冶炼可以通过改善焦炭质量,降低燃料比,提高煤比,提高烟煤配比,优化配矿结构和高炉炉料结构,适当提高渣比以及提高高炉适应高Al2O3 操作的能力等措施来降低Al2O3 对高炉冶炼的影响.     

使用高比例塞矿烧结矿高炉炉料结构探讨

作为降低成本的重要手段之一,济钢烧结大比例配加塞拉利昂矿在短期内难以改变,高比例塞矿烧结矿因高温冶金性能差影响了高炉顺行。通过分析高炉在用烧结矿、球团矿及块矿的高温冶金性能以及合理炉料的要求,在当前原燃料条件下,济钢3 200 m3高炉适宜的炉料结构为75%400烧结矿+25%球团矿和澳矿。该炉料结构既能满足高炉正常冶炼(包括碱度、产量、渣中Al2O3高等)的需求,又能降低炉料成本。     

南通宝钢420 m3高炉高Al2O3炉渣冶炼实践

针对南通宝钢420 m3高炉原料质量劣化,大量高Al2O3矿进入高炉造成炉渣中Al2O3含量高的问题,通过对炉渣的性能进行分析,及时调整高炉操作制度,改善炉渣性能,加强炉前管理等措施,确保了高炉在高Al2O3炉渣冶炼条件下的稳定顺行,提高了操作技能和操作水平.     

济钢高炉高渣比、高(Al_2O_3)条件下的低硅冶炼操作技术

对济钢高炉高渣比、高(Al_2O_3)条件下的低硅冶炼操作技术进行了总结。通过采取优化操作制度、降低休慢风率等一系列措施,解决了高渣比、高(Al_2O_3)带来的技术难题,实现了高炉低硅冶炼。     

3-Hydroxy-3-methylglutaric aciduria: deficiency of 3-hydroxy-3-methylglutaryl coenzyme A lyase

Basic principles are offered to support the suggestion that use of special care space must be made with a mind toward prevention of obsolescence. Certain conventional design features should be examined critically and decisions made as to their applicability to the needs of a particular program.     

Effects of Ce3＋ , Nd3＋ , Gd3＋, Tb3＋ and Lu3＋ ions on Formation of CaCO3

The effects of lanthanides at various concentrations on CaCO3 crystal growth were studied by X-ray diffraction (XRD), infrared spectra (IR), X-ray photoelectric energy spectra (XPS) and inductively coupled plasma mtms spectrometry (ICP-MS). It was found that the calcite, a stable form of CaCO3 in thermodynamics, is the predominant species. The research indicates that lanthanide ions (Ln3 ) can partly substitute the Ca2 in the lattice of CaCO3 crystals, and change the crystal characterization and direct the ordinal growth of CaCO3 crystals.     

Photoluminescence of Dy~(3 ) Ions in Ba_3La(BO_3)_3

Dy3 isanimportantactivator .Ithasbeenexten sivelyappliedinmanyluminescentmaterials .Inre centyears ,someresearchershavestudiedthespec trumcharacteristicsofluminescentmaterialsdopedDy3 [1～ 6 ] andhaveobtainedsomemeaningfulre sults .InordertodevelopnewfluorescentmaterialsanddiscussthephotoluminescentruleofDy3 inthecomplexborate ,thispaperstudiesthephotolumines centcharacteristicsofDy3 inBa3La(BO3) 3host ,anddiscussestheinfluenceofthecharge to radiusratio(z/r)ofrareearthionRE3 andthecon…     

Dy^3＋在（LaO）3BO3和（GdO）3BO3中的光致发光

研究了Ｄｙ＾３＋在（ＬａＯ）３ＢＯ３和（ＧｄＯ）３ＢＯ３中的光致发光;探讨了基质晶体结构、稀土离子ＲＥ＾３＋的电荷半径比（Ｚ／ｒ）和Ｄｙ＾３＋含量对（Ｄｙ＾３＋）发光强度及发光颜色的影响;分析了（ＧｄＯ）３ＢＯ３中Ｂｉ＾３＋对Ｄｙ＾３＋发光的敏化作用及Ｄｙ＾３＋４Ｆ９／２→＾６Ｈ１３／２超灵敏跃迁发射的自身浓度猝灭机理。     

Ca3La(BO3)3中Dy3+的光致发光

研究了Ca3La(BO3)3基质中Dy^3 的发射光谱和激发光谱。结果表明，强的激发峰值为351nm、367nm和386nm；Dy^3 的488nm和578nm发射的最佳浓度均为xDy=0．03；Dy^3 发射的黄光和蓝光强度比(用Y／B表示)随Dy^3 浓度的增加而逐渐增大；Dy^3 的^4F9/2→^6H15/2、^6H13/2跃迁发射的浓度猝灭机理均为电偶极-电偶极相互作用；同时还探讨了Ce^3 对Dy^3 发光的敏化作用。     

Optical Spectroscopy of Er^3＋ and Er^3＋/Yb^3＋ Co-doped Bi2O3-GeO2-B2O3-ZnO Glasses

The （60 - x）Bi2O3 - xGeO2-30B2O3-10ZnO （x = 5, 10, 20, 30 molar percent） glasses doped with Er^3＋ and Er^3＋/Yb^3＋ were fabricated using the melting method. The thermal stability of the glasses was studied with their DTA curves. The results show that the difference between the glass transition temperature and the crystallization onset temperature increases with the increase of GeO2 content, indicating that the thermal stability of the glass has become better. The absorption spectra were recorded and the stimulated emission cross sections were calculated using the McCumber theory. The Ω2, O4, and Ω6 parameters,the transition probability, the radiative lifetime, and the fluorescence branch ratio of Er^3＋ for optical transition were calculated from their absorption spectra in terms of reduced matrix U^（t）（λ = 2, 4, 6） character for optical transitions. The infrared emission of Er^3＋ was measured upon excitation with 970 nm light and the full width at half-maximum （FWHM） was estimated from the emission spectra. The pumping efficiency and the intensity of the emission at the 1.54 μm band of Er^3＋ were enhanced considerably by co-doping Yb^3＋ .