烧结电除尘灰球团制备及脱锌探索

为减少烧结资源的二次浪费,探索用烧结电除尘灰制备为高冶金性能和低锌含量的金属化球团矿。将烧结电除尘灰配加轧钢皮、活性炭、膨润土以及有机黏结剂的混合料造成生球并经预热、焙烧后,检测各组球团矿耐压强度及脱锌率。结果表明:随着活性炭配比的增加,球团矿耐压强度先增加后降低,在活性炭质量分数为3%时,达到最高;活性炭含量为1%~4%时,脱锌率基本不变,为47%;在活性炭含量为5%时,脱锌率下降;烧结电除尘灰中配加3%的活性炭能得到较好冶金性能及低锌含量的金属化球团矿。     

竖炉球团配用不同进口精矿的试验研究

介绍了马钢配用7种不同进口精矿进行造球和工业投笼试验的情况.综合经济效益分析结果,得出以下结论:巴A与MBR 2种精矿为较适宜的进口高品位造球原料,其经济效益可观,其次为巴C精矿,随后是弗布卡、弗乔,巴B、沙马可精矿.     

Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation

The carbonation and microstructure characteristics of pellets containing ferrous dusts were investigated during carbonation consolidation at different reaction temperatures and CO2 partial pressures.The results indicated that green pellets had loose and network supporting structure with initial strength,and large cracks and pores existed in the pellets.The carbonation reaction was controlled by interfacial chemical reaction at the initial fast stage,which limited diffusion and thus caused the reaction rate to decrease.With increasing reaction temperature and CO2 partial pressure,the conversion rates of CaO and the number of microcrystalline CaCO3 particles increased,and the volume expansion of CaCO3 led to a decrease in the open porosity,average pore size and specific surface area of the pellets.Micro-pores were occluded,and the number of smaller pores(diameter less than 50nm)increased,thereby resulting in the more compact and uniform structure of carbonated pellets.Simultaneously,the dense structure prevented CO2 diffusion into the product layer,affecting the increase in carbonation conversion rate.     

攀钢高炉大规模使用钒钛球团矿冶炼实践

对攀钢高炉大规模使用钒钛酸性氧化球团矿工业试验与生产实践进行了总结,结果表明,用钒钛球团矿大规模代替钒钛烧结矿试验与生产是成功的.当球团矿配比最高达到32%时,高炉没有出现不适应,利用系数提高,焦比降低.综合考虑攀钢炉料结构,＂高碱度低钛烧结矿＋全钒钛精矿酸性球团矿＂是最佳炉料结构,烧结中加入普通粉矿质量最佳,全钒钛磁铁精矿球团矿质量最好,钒钛磁铁精矿的最佳利用方式是生产球团矿,不适合于生产烧结矿.     

高炉护炉用钒钛球团矿的开发

针对新西兰高钛粗矿粉含钛量较高的特点,制成含钛球团用于高炉护炉。根据球团生产工艺原理,设计了生产球团的工艺流程并确定了技术要求,试验及使用结果表明,研制生产的含钛球团矿具有强度高、含铁品位高,成本低等特点,起到了高炉护炉及降低炉料成本的双重作用。     

碳化硼锆合金可燃毒物中空芯块制备工艺研究

以氢化锆粉与碳化硼粉为原料,用橡胶模成型方法成型,真空烧结炉中脱氢;在800¹100℃下保温1 h,制得碳化硼锆合金可燃毒物中空芯块烧结体;用浸渍法测量芯块的致密度和开孔率,研究烧结温度和碳化硼含量对烧结体致密度的影响;用扫描电镜分析坯体与烧结体的微观结构。结果表明,碳化硼锆合金烧结体的致密度随烧结温度的升高而增加,随碳化硼含量的增加而降低,碳化硼颗粒在锆合金中分布比较均匀,当碳化硼质量分数为0.5%,烧结温度在1000℃以上时,烧结体致密度达到95%以上,开孔率低于1%。     

LWR Fuel Safety Research with Particular Emphasis on RIA/LOCA and Other Conditions

Fuel safety research at Japan Atomic Energy Research Institute (JAERI) is reviewed on the major subjects including studies on fuel behavior under postulated Reactivity Initiated Accident (RIA), postulated Loss of Coolant Accident (LOCA) and normal operating conditions. Nuclear Safety Research Reactor (NSRR) at JAERI has been utilized extensively for the studies of fuel behavior under RIA conditions. For the studies of fuel rod and cladding behavior under LOCA conditions, outpile experiments were conducted. The work on this subject has been concluded. Pellet Cladding Interaction (PCI) has been major subject on fuel integrity study during normal operating conditions. Irradiation experiments at Halden Boiling Water Reactor (HBWR) as well as code development are described.     

钛精矿冷固结团块实验

采用正交实验的方法,研究了钛精矿通过液压机进行冷固结实验的成型性能和强度性质。实验用钛精矿作为原料,改变黏结剂配比、成型压力、水分加入量等工艺条件探索适合液压机造块的工艺参数。运用极差分析和方差分析法处理实验数据,对影响团块性能的各因素进行显著性分析。结果表明,在实验数据范围内,黏结剂的加入量对团块质量的影响最大。     

Strength and high temperature behaviour of carbon composite pellets containing BOF fine dust

Abstract

Steel plants produce significant amounts of dust and sludge during iron and steel production. These wastes contain valuable elements, such as Fe, Cr, Ni, C, K and Na and should be handled properly to prevent them from polluting the environment. In order to utilise the BOF fine dust, the effects of the dust on cold bonded pelletising, solid state reduction and reduction melting behaviours of composite pellets made from iron ore and anthracite with added BOF fine dust were investigated at laboratory scale. The BOF dust was found to improve the cold compressive strength of the wet green carbon composite pellet, and increased with increasing dust content. Almost four times the amount of dust was needed to get the same effect on the strength of the pellet when it was used to replace bentonite. The carbothermic reduction of the composite pellet proceeded effectively at temperatures above 1200°C. The BOF dust had a positive effect on the reduction rate of the pellet, and the rate increased with increased dust content. The reduction of iron oxide was topochemical and conformed to a shrinking core kinetic model. The dust was found to improve the iron and slag melting separation rate of reduced pellets at 1400°C when its content was less than 23·11 wt-%. The liquidus temperature of the slag would decrease with the content of BOF dust increasing from zero to ～30 wt-% and then increase if the content continued to become more in the experiment. Utilising the BOF dust as the binder and flux to adjust the composition of the slag system can potentially reduce the slag ratio and production cost compared with using bentonite and limestone. This work can help to find a new process for the effective utilisation of BOF dust in a more appropriate and environmentally friendly way.