大罐顶渣向钢液增氧因素分析

 依据实验数据计算结果,对钢液增氧的因素及其采取的相应措施进行了分析与探讨。研究结果表明：在氧化性顶渣条件下,钢液中w（［Als］）的变化率≥20％,而在还原性顶渣条件下,钢液中w（［Als］）的变化率≤10％;氧化性顶渣对钢液供氧的贡献率大于钢包与中间包衔接的水口处吸气对钢液供氧的贡献率;减少转炉下渣量及对顶渣进行改质可减轻炉渣向钢液供氧程度;大罐下渣量不会使中间包成为新的增氧源。     

FeO基氨合成催化剂的结构与机械性能研究

通过对氧化态FeO基氨合成催化剂的相组成、晶相结构及铁比值与机械强度的关系的考察研究。结果表明:FeO基催化剂结构紧密,各种粒度的工业催化剂机械磨耗率都较低;机械强度随FeO相的增多而提高,纯FeO相的磨耗率最低;Fe2+∶Fe3+比值在3.47～8.43,机械强度均高于Fe3O4基催化剂,且随Fe2+∶Fe3+比值的上升而增高。为工业生产中保持催化剂的颗粒完整,降低阻力,实现稳产、高产提供了催化剂机械结构性能依据。     

Role of supported metals in the selective reduction of nitrogen monoxide with hydrocarbons over metal/alumina catalysts

The promoting effect of supported metals on alumina catalyst was investigated for the reduction of nitrogen monoxide in oxygen-rich atmospheres. For NO reduction with propene over impregnated CoO/A1₂O₃, the first reaction step was found to be the oxidation of NO to NO₂ probably catalyzed by dispersed cobalt species. The next reaction step, which is the reaction of NO₂ with propene to form N₂, was considered to take place on the alumina surface. Although the activity of impregnated FeO/A1₂O₃ was low because of the presence of large iron oxide particles catalyzing propene oxidation with dioxygen, FeO/A1₂O₃ prepared with sol-gel method showed excellent deNO_x activity.     

Iron oxide-impregnated filter paper (Pi test): II. A review of its application

The iron oxide impregnated filter paper test (P_i test) is a recently developed soil test for phosphorus (P) in which the FeO paper acts as an infinite sink for P mobilized in a soil solution. Several papers have been published evaluating the effectiveness of the test for predicting plant availability of P under different soil conditions. The use of FeO paper to predict algal availability of P in water bodies and runoffs has also been studied.The purpose of this paper is to review studies on the use of the P_i test to evaluate plant availability of P in soils, and predict availability of P to algae in an aquatic environment. Phosphorus extracted by the FeO paper is primarily physically bound extractable (resin P) and correlates significantly with Bray I and Mehlich P in acid soils and Olsen P in calcareous soils. Dry-matter yield and P uptake by maize (Zea mays L), kidney beans (Phaseolus vulgaris L), and upland rice (Oryza sativa L) grown in acidic soils correlated well with P_i-P. Likewise, in calcareous soils, P_i-P was as good as Olsen-P in predicting crop response. Field trials have shown that the P_i test is a good predictor of plant yield in soils with wide ranging properties. Compared to the standard method to measure bioavailable P to algae in waters and agricultural runoffs involving lengthy algal essays culturing selenastrum capricornutum with sediment samples, the P_i method is a faster and easier method to estimate P that may be potentially available for uptake by algae.     

新钢降低烧结矿氧化铁含量的生产实践

简要介绍了新钢烧结厂近几年在保证烧结矿转鼓强度的情况下，通过控制烧结能耗、提高烧结矿碱度、严格生产工艺管理，使烧结矿FeO含量大幅度降低，改善了烧结矿的还原性能。     

KMnO4改性K2FeO4电极的电化学性能研究

利用次氯酸盐氧化法制备了电池级K2FeO4,并将部分产品表面均匀分布了一层KMnO4。分别采用X射线衍射(XRD),扫描电子显微镜(SEM)及恒流放电等电化学测试技术对K2FeO4和K2FeO4/ KMnO4复合物的表面物理形貌,结构以及电化学性能进行了分析。结果表明K2FeO4具有良好的晶形,而K2FeO4/ KMnO4复合材料的表面确实均匀分布了一层KMnO4。恒流放电测试表明K2FeO4/ KMnO4复合电极的放电容量平均比单纯K2FeO4电极的放电容量增大10%以上,放电平台提高50 mV左右。循环伏安结果表明高价锰参与KFeO的放电过程,并对高铁的放电起催化作用。     

烧结矿FeO含量的确定

对国内烧结厂的烧结矿FeO操作进行了统计分析，结果表明．烧结厂的FeO操怍主要受原料中精矿比例、烧结料层厚度、烧结矿碱度和MgO、SiO2含量的制约．对一台已确定工艺的烧结机，片面追求低FeO操作是不现实的，应针对各自的烧结工艺特点，由试验确定适宜的FeO指标。     

经表面修饰的FeO(OH)胶粒制备动态膜及其脱色性能

研究了FeO（OH）动态膜的膜通量衰减与FeO（OH）胶粒的凝并关系。以阴离子表面活性剂对FeO（OH）胶粒表面修饰并将其形成的动态膜与未修饰时比较,结果显示：成膜时间从6～8h减少至1～2h;在同样成膜压力（0.11MPa）下,膜通量增大13．2％,在最大值条件（0．24MPa和0．11MPa）下,膜通量增大24．1％;用该膜处理印染厂二沉池排水,脱色率高达98．5%,膜通量增加40％-150％,运行周期提高2～3倍。     

莱钢90t转炉喷溅原因分析与对策

莱钢特钢厂90t转炉喷溅的主要原因是突发性碳氧反应、熔池温度骤降和FeO过多积累、高硅高磷铁水和留渣操作等。通过优化枪位控制、加料时机控制、熔池温度控制、留渣操作控制等,使钢铁料消耗降低了5.5kg/t、喷溅渣降低了8.1kg/t,使耐材消耗、氧气消耗、石灰消耗分别降低了0.22kg/t、1.2m3/t、1.8kg/t。     

Influence of Iron Ore Characteristics on FeO Formation During Sintering

  The influence of iron ore characteristics on FeO formation during sintering was examined mainly in terms of chemical composition and the melting characteristics of iron ores. Statistical regression and X ray diffraction were used to further explain the specific effect of iron ore characteristics on FeO formation. The results indicate that LOI (loss on ignition) in iron ores have a positive influence on FeO formation by promoting the sintering process of Fe2O3 decomposing and reducing. Silica contents in iron ores play a determining role in final content of FeO in sinter. The melting characteristics of iron ores significantly affect FeO formation during sintering.