惰性阳极基体材料NiFe2O4尖晶石的研制

本文用Ni2O3和Fe2O3为原料制备了铝电解用惰性阳极基体材料NiFe2O4尖晶石,详细介绍了整个制备过程。通过对NiFe2O4尖晶石的含量、真密度以及开口孔隙率等重要指标进行研究比较,最终得出了制备NiFe2O4尖晶石最佳工艺条件,并用最佳工艺条件重新制取试样进行热腐蚀实验。     

Chemical composition and tolerance factor at the morphotropic phase boundary in (Bi0.5Na0.5)TiO3-based piezoelectric ceramics

A quantitative relation between the morphotropic phase boundary (MPB) composition and the tolerance factor (t) in (Bi_0.5Na_0.5)TiO₃ (BNT)-based piezoelectric ceramics was established. The t value of the MPB compositions in BNT-based ceramics is around 0.990–0.993 and is independent of the types of added compounds. In order to experimentally demonstrate it, two piezoelectric ceramic systems (1 ? x)(Bi_0.5Na_0.5)TiO₃–x(Ba_1?aSr_a)TiO₃, a = 0.05 and 0.3 (BNBST5-x and BNBST30-x, x < 12%), were used. X-ray diffraction patterns and the lattice parameter investigations revealed that these two systems formed solid solutions within the studied stoichiometry and showed a rhombohedral–tetragonal phase transformation. Furthermore, both the structure analysis and electric properties measurements indicated that the MPB compositions were BNBST5-6 and BNBST30-8 and their corresponding t value were 0.9900 and 0.9903, respectively. The results confirm the relation between the MPB composition and t value and provide a method for designing new piezoelectric materials.     

流化床反应器的流动模型

在理论分析的基础上,建立了流化床反应器的流动模型,给出了气体流速、床体尺寸、处理能力等参数的计算公式和判断内部流态化流型的依据。在此基础上,给出了1个模型的算例,并与文献给出的计算结果相比较,结果表明二者的符合性较好,根据模型计算得到的参数具有良好的合理性。该模型对使用流化床反应器炼铁有一定的指导意义。     

电镀法制备多孔光催化材料及其性能研究

以多孔泡沫镍为载体,采用电镀法制备多孔光催化材料,并研究其对水中罗丹明B的降解性能.结果表明,多孔光催化材料对水中罗丹明B的光催化降解反应严格符合零级动力学规律.最佳制备工艺条件为：电镀液中硫酸镍浓度180g/L;镀液中P25型纳米TiO2粉体投加量2g/L;电镀温度45℃;搅拌速度4档.Bi2O3和ZnO复合改性使产品的光催化性能提高,复合粉体中的Bi2O3和ZnO起电子-空穴分离的桥梁作用.纳米Bi2O3复合量达7%或ZnO复合量为2%时,产品的光催化性能最优.Ag修饰使经Bi2O3或ZnO复合的光催化材料的光催化性能有所提高.经Bi2O3复合的光催化材料的最佳Ag修饰量为1%,经ZnO复合的光催化材料的最佳Ag修饰量为4%.     

覆盖剂和保温层对钢包钢水温降影响的数值模拟

通过建立数学模拟研究了添加覆盖剂和保温层对钢包静置过程中钢水温降的影响。结果表明:钢包静置过程中,钢水通过其上表面及钢包的包衬向外界传递热量,钢水温度下降。添加保温覆盖剂可使钢水上表面热损失大幅度下降,从而有效减小钢水温降。添加保温层可有效减小钢水通过钢包包衬向外界环境散失的热量,从而有效减小钢水温降。     

以F200和Sorbead WS为保护层真空变压吸附捕集CO2（英文）

In order to solve the water issues when 13X zeolite was applied to capture CO 2 from wet flue gas by vacuum swing adsorption process, multi-layered adsorption system was considered regarding activated alumina F200 and silica gel based Sorbead WS as pre-layer materials. LBET (extended Largmuir-BET) model and extended CMMS (cooperative multimolecular sorption) equation were simulated respectively to describe water loading on F200 and Sorbead WS. The two equations can be well added into our in-house simulator to simulate double-layered CO 2 -VSA (vacuum swing adsorption) process. Results indicated that water can be successfully stopped in pre-layers with a good CO 2 capture performance.     

油页岩浮选降灰富集有机质的实验研究

油页岩是有机质、无机矿物质和水分构成的含灰量较大的可燃有机岩石,是重要石油替代和补充资源。但其生产成本较高,制约着油页岩的应用。本文采用浮选技术,对抚顺油页岩进行了浮选实验研究。实验结果表明,油页岩试样粒度为0.074～0.125 mm,浮选效果较适宜。无论采用油酸捕收剂,还是采用煤油类捕收剂,对油页岩进行浮选,都有一定的效果,但效果不显著,这是由于该油页岩的矿物质以硅铝酸盐黏土矿为主,可浮选性较差。     

Control Model of Bloom Dynamic Soft Reduction

There are significant effects of process parameters on internal qualities of bloom,and these process parameters are as follows:position and reduction amount,reduction distribution,reduction rate,and so on.Developing a control model is the key to apply soft reduction technology successfully.As the research object,360 mm×450 mm bloom caster in PISCO (Panzhihua Iron and Steel Co.) has been studied,and the research method for control model of dynamic soft reduction has been proposed.On the basis of solidification and heat transfer model,the position of soft reduction and reduction distribution of each frame are determined according to the bloom temperature distribution and solid fraction in bloom center calculated.Production practice shows that the ratio of center porosity which is less than or equal to 1.0,increased to 97.27%,ratio of central segregation which is less than or equal to 0.5,increased to 80.91%,and ratio of central carbon segregation index which is more than or equal to 1.10,decreased to 4% with the applying model of dynamic soft reduction.     

大方坯连铸动态轻压下控制模型的开发与应用

动态轻压下控制模型的开发与应用是实现轻压下参数有效、稳定实施的关键环节。结合攀钢2号大方坯连铸机设备特点,研究开发了大方坯动态轻压下控制模型,阐述了轻压下实施过程中各拉矫机压下辊设定值的计算方法。模型投用后铸坯内部质量得到显著改善,铸坯中心疏松≤0.5级综合比例和中心偏析≤0.5级综合比例分别提高35.46%和9.81%。