基于人工神经网络的烧结矿FeO预报系统

针对现场烧结矿FeO控制复杂与难度大的实际。采用改进后的4层前向神经网络。进行多因素输入建模，输出采用主因线性相关与次因非线性相关叠加。预报烧结矿FeO。为现场烧结矿FeO控制提供了新的可行方法。该网络结构设计先进合理，精度高，泛化能力强。训练误差平方和为0．0794，用训练样本集测试FeO输出。检验的绝对平均误差为0．109467，命中率97．81％。采用训练后网络预报。其绝对平均误差为0．1068255，命中率100％。     

Sulphide Capacities of CaO‐SiO2‐Al2O3‐MgO Slags

In Japanese steelworks, hot metal is now being produced by a scrap melting process. With this process, removals of sulphur is very much handicapped because of very high sulphur levels (0.04‐ to 0.09‐ pct by weight) and relatively low tapping temperatures (1623 to 1723 K). In order to overcome such handicaps, the authors explored on the respective phase diagrams. These explorations revealed that {CaO‐SiO₂‐Al₂O₃‐MgO} slags with Al₂O₃ contents of 30‐ to 35‐pct by weight would be good candidates as reagents for sulphur removal from high sulphur hot metal at relatively low temperatures. For better understanding of the thermodynamic properties of the candidate slags, in this study, sulphide capacities were determined through gas/slag equilibrium technique. The experimental results suggest that there would be, at least, a “window” to remove sulphur from high sulphur hot metal as relatively low temperatures.     

烧结机扩容对烧结矿FeO含量及转鼓强度的影响

在实验室条件下,探讨了烧结机扩容对烧结矿中FeO含量及烧结矿的转鼓强度的影响．试验表明,扩容有利于降低FeO含量,但扩容比例不当时将存在烧结死区．当烧结杯一维扩容15％时,料柱的平均转鼓强度为74．6％,与未扩容时相比,强度有所下降,但仍能满足生产要求．同时考虑到扩容增产的效果,认为扩容15％是有利的。当扩容百分比大于15％,烧结死区进一步扩大,使烧结矿的质量急剧下降,将难以满足高炉生产的要求．     

热风冲天炉配加海绵铁代替废钢的生产实践

热风冲天炉熔炼低碳铁液,选择海绵铁代替废钢,在技术上可行,在生产实践中也满足了球铁管生产对铁液的质量要求,对球铁管主要质量指标没有不良影响,并取得显著的经济效益。冲天炉操作中要采取适当措施,使炉渣中的FeO含量不超过5％。     

焦炭与废塑料共混对电炉炼钢渣中FeO还原作用的探究

实验研究了冶金焦与高密度聚乙烯(HDPE)塑料共混物1 550℃对电炉炉渣(47%FeO)的还原作用。实验在卧式管式炉中进行,并与使用红外气体分析仪和多重气相色谱分析仪的烟气分析相结合。结果表明,与纯焦炭相比,焦炭/塑料共混物对炉渣的FeO还原速率明显提高,最大还原速率是纯焦炭的两倍以上。随着共混物中HDPE含量的增加,废气中的CO2含量降低了75%。此外,当使用焦炭与塑料共混物作为还原剂,金属的渗碳程度和硫去除率有了显著提高。高温下废塑料析氢反应提高了还原、渗碳和脱硫的速率。     

水中水合肼还原芳香族硝基化合物的研究

以NaOH溶液沉淀FeCl3溶液制备了催化剂FeO(OH)。在水中用FeO(OH)催化水合肼还原9种芳香族硝基化合物得到相应的芳胺,收率96%-99%。并以邻硝基甲苯为反应底物考察了水合肼用量、催化剂用量、反应温度和反应时间对产物收率的影响。较优的反应条件为:n(水合肼)∶n(邻硝基甲苯)=2∶1;催化剂FeO(OH)的用量为0.015 g/mmol邻硝基甲苯,80℃反应50 min,邻甲苯胺的收率达98%。     

富氧化铁炉渣的溅渣护炉机理

上海第一钢铁（集团）公司30t转炉所用铁水条件较差,导致终渣中氧化铁含量很高。由于转炉出钢温度也偏高,实施溅渣护炉以大幅度提高炉龄比较困难。实验室与工业试验研究结果表明：（1）溅渣层中富氧化镁RO相是冶炼过程中抵抗高温、高氧化性炉渣侵蚀的骨架;（2）溅渣过程中富氧化铁改质渣在炉衬表面出现的异份分流现象有利于溅渣层保留较多氧化镁物相。     

Bi_(0.8)La_(0.2)FeO_3/La_(0.7)Sr_(0.3)MnO_3/SrTiO_3纳米晶多铁薄膜的制备

以SrTiO3(STO)为基片,以La0.7Sr0.3MnO3(LSMO)为缓冲层,采用脉冲激光沉积法制备了Bi0.8La0.2FeO3(BLFO)/LSMO/STO多铁薄膜。通过生长条件控制,得到单相的BLFO薄膜,且沿(100)面生长,晶粒尺寸为40nm,厚度为223nm。BLFO/LSMO/STO纳米晶薄膜的最大电极化为25μC/cm2,饱和磁化强度为30kA/m,具有多铁性能。     

烧结矿中FeO含量的影响因素分析

讨论了FeO含量对烧结矿冷强度和烧结矿低温还原粉化率RDI＋3.15的影响。降低烧结矿中的FeO含量有利于提高烧结矿还原性,但是过低的FeO含量会降低RDI＋3.15。研究发现,降低料层厚度和混合料水分、提高配碳量和焦粉粒度均能提高烧结矿中FeO含量;另外,降低R、提高SiO2含量也可以提高FeO含量。     

Reduction of FeO in EAF Steelmaking Slag by Blends of Metallurgical Coke and End‐of‐Life Tyre

The reduction of FeO‐containing slag by blends of metallurgical coke and end‐of‐life tyres (RT) have been investigated through experiments conducted in a laboratory‐scale horizontal tube furnace. Composite pellets of EAF slag (47.1% FeO) with coke, RT, and blends of coke/RT (in four different proportions) were rapidly heated at 1550°C under high purity argon gas and the off gas was continuously analyzed for CO and CO₂using an online infrared (IR) gas analyzer. The extent of reduction after 10 min, level of carburization and desulfurization, and the total amount of CO₂ emissions were determined for each carbonaceous reductant. The results indicate that the extent of reduction, level of carburization and desulfurization of the reduced metal are significantly improved when coke is blended with RT. Blending of coke with RT resulted in a decrease in direct CO₂ emissions from the reduction reactions.