济钢320m2烧结机的余热发电系统

介绍了济钢第二烧结厂烧结余热发电系统的基本情况和组成,对该系统的设计特点和存在的不足之处进行了分析.     

降低烧结生产成本的几点作法

指出了冶金企业在市场竞争中要降低成本，烧吉应首先优化原、燃料结构、提高科技含量，节能降耗，生产高品位，高碱度的烧结矿。     

耐磨铸铁筛板的研究和应用

分析了热矿筛筛板使用寿命短的原因，反材料的高温硬度低和高温耐磨性差是主要因素。为了改善筛板材质的性能，对其化学成分进行了科学设计，并探讨了铸造和热处理工艺。研究表明，新筛板的使用寿命达到CrMnN钢筛板的两倍。新筛板价格与CrMnN钢的相近，经济效益显著。     

莱钢低硅烧结矿试验研究与生产实践

根据莱钢烧结厂烧结矿原料条件 ,分析了低硅烧结矿的特点 ,作了实验室低硅烧结试验 ,在此基础上 ,通过采取优化原料结构 ,提高烧结矿碱度 ,推行厚料层烧结技术等措施 ,成功实施了低硅烧结生产。烧结矿品位由 5 5 .94%提高到5 8.2 5 % ;Si O2 含量由 5 .62 %降低到 4.3 5 %。     

韶钢24m2烧结机尾SHWB型电除尘器的改造

分析了韶钢 2× 2 4m2 烧结机机尾 2 0m2 SHWB型电除尘器存在的问题。在现场条件受到限制的情况下 ,采用宽间距技术对其进行改造 ,收到了良好的效果。     

Sintering kinetics and properties of NiFe2O4-based ceramics inert anodes doped with TiN nanoparticles

Sintering kinetics of NiFe₂O₄-based ceramics inert anodes for aluminum electrolysis doped 7 wt% TiN nanoparticles were conducted to investigate densification and grain growth behaviors. The linear shrinkage increased gradually with the increasing sintering temperature between 1000 and 1450°C, whereas the linear shrinkage rate exhibited a broad peak. The maximum linear shrinkage rate was obtained at 1189.4°C, and the highest densification rate was achieved at the relative density of 75.20%. Based on the pressureless sintering kinetics window, the sintering process was divided into the initial stage, the intermediate stage, and the final stage. The grain growth exponent reduced with increased sintering temperature, whereas the grain growth activation energy decreased by increasing sintering temperature and shortening dwelling time. The grain growth was mainly controlled by atomic diffusion. NiFe₂O₄-based ceramics possessed high-temperature semiconductor essential characteristics. The electrical conductivity of NiFe₂O₄-based ceramics first increased and then decreased with increasing sintering temperature, reached their maximum value (960°C) of 33.45 S/cm under 1300°C, mainly attributed to the relatively dense and uniform microstructure. The thermal shock resistance of NiFe₂O₄-based ceramic was improved by a stronger grain boundary bonding strength and lower coefficient of linear thermal expansion.     

利用粉煤灰低温熔制基础玻璃的研究

以粉煤灰为主要原材料,添加适当的工业级硼酸、石灰石、氧化锌、氧化镁、二氧化硅、碳酸钠作为辅助材料,选择铝硅酸盐系统作为配方,制备基础玻璃。通过DTA和TEM研究不同配比的基础玻璃配方表明,最合理基础玻璃在1 200℃熔制是可行的,粉煤灰的利用率达到了30%以上,最适宜的玻璃组成是(%):S iO245~60,A l2O39~15,CaO 12~20,MgO 2~5,Na2O 3~11,ZnO 2~5,S 0~1,B2O30.5~1.5,F 0~2.5。     

宝钢热废气烧结实验室研究烧结矿矿相分析

在实验室条件下研究了不同热废气温度对宝钢原料条件下烧结矿的产质量的影响，并着重利用矿相分析对结果进行了分析的讨论。     

莱钢高炉炉料冶金性能研究及合理炉料结构实践

研究了莱钢 75 0 m3高炉炉料的冶金性能 ,高碱度烧结矿具有良好的冶金性能 ,而酸性球团矿冶金性能比烧结矿差 ,但熔滴性能好。生产实践证明 ,在莱钢铁前现有工艺装备条件下 ,碱度为 1.7～ 1.8的烧结矿 (70 %～ 75 % )配加酸性球团矿 (约 2 5 % )及少量块矿是较为合理的高炉炉料结构。     

Spherical-Impact Damage and Strength Degradation in Silicon Nitrides for Automobile Turbocharger Rotors

Spherical-impact damage to two silicon nitrides is investigated. Gas-pressure-sintered silicon nitride exhibits an elastic response to impact by spherical partially stabilized zirconia particles, resulting in Hertzian cone-crack initiation in the sintered body. Pressureless-sintered silicon nitride, on the other hand, demonstrated an elastic/plastic response, with median/radical-crack initiation. These differences in behavior are due to their microstructural differences as well as to the different hardness values of the silicon nitrides in relation to those of the PSZ spheres. The postimpact bend strength of silicon nitrides is also degraded when crack length exceeds the inherent flaw size.