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Development of new process for rapid pig iron making in high oxygen potential at low temperature in order to reduce carbon dioxide gas emission

开发低温高氧势快速生铁新工艺以减少二氧化碳气体排放

基本信息

批准号：
15106011
负责人：
NAGTA Kazuhiro
金额：
$ 70.05万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (S)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2007
项目状态：
已结题

项目摘要

The Tatara was the traditional ironmaking process in Japan and came from Korea in the late of 6 centuries. It had the box-type furnace with 1.2m height using clay and produced mainly pig iron from iron sand and charcoal. This process was the unique way in the world for producing pig iron In the middle of Meiji period, the Tatara was improved and the furnace with 3m height was constructed using firebricks. The furnace was called as "Kakuro". However, the Kakuro process was not so suitable for ironmaking from powder iron ore because of its flying. The reduction rates of iron oxides ground with graphite by a ball-mill were measured using a high temperature X-ray deffractometer. Increasing the milling time, the starting temperature of reduction decreased by 30 to 100K and the activation energies of reduction from hematite to magnetite and from magnetite to wustite decreased. That from wustite to iron increased. The surface of Fe1-xO was analyzed using STM analyzer. The surface broken in va … More cuum was random. When it was heated in vacuum for 15 min. at 800℃, the step with <110> direction grew and the surface construction of (1x1), (4x2) and the mash with about 3nm square appeared on the surface of (100). After heating in vacuum for 15 min at 1000℃, all surface was occupied with the mesh. The mesh meant that the clusters of Fe atomic vacancies in wustite appeared on the surface. The initial reduction of wustite on the surface radiated by H+ ions showed that the mesh structure disappeared and the small iron particles with 2-3nm diameter stayed on the surface. The dielectric constant and magnetic permeability of magnetite were measured to have the maximum near 2.45GHz of microwave. The carbon-composite pellet of about 10g was heated to 1370℃ for 5 min using 3kW microwave and produced pig iron. The increasing rate of temperature depended on the weight of pellets and not on the diameter of iron are powder. The concentration of impurities of pig iron was lower by one tenth than that of pig iron produced in blast furnace. The continuous process of pig iron making by microwave using the mixture of iron ore and coke powder was examined. Two problems were pointed out that insulators absorbed microwave and the absorption efficiency of microwave energy into resources was low. The new types of microwave furnace were proposed. One is the furnace that microwave beams are concentrated in the center of furnace and another is the rotary kiln type microwave furnace. Less

Tatara 是日本传统的炼铁工艺，于 6 世纪末从韩国传入。它有1.2m高的箱式炉，使用粘土，主要用铁砂和木炭生产生铁。这种工艺是世界上独一无二的生铁生产方法。明治中期，对塔塔拉进行了改进，用耐火砖建造了3m高的炉子。该炉被称为“Kakuro”。然而，由于散粉法会飞散，所以不太适合铁矿石粉炼铁。使用高温X射线衍射仪测量通过球磨机与石墨一起研磨的氧化铁的还原率。增加球磨时间，还原起始温度降低30～100K，赤铁矿还原磁铁矿、磁铁矿还原维氏体的活化能降低。从维氏体到铁增加。使用STM分析仪对Fe1-xO的表面进行了分析。真空中破裂的表面是随机的。当其在真空中加热15分钟时。 800℃时，<110>方向的台阶生长，(100)表面出现(1x1)、(4x2)和约3nm见方的糊状物的表面结构。在1000℃真空加热15分钟后，所有表面都被网格占据。网格意味着表面出现了维氏体中的Fe原子空位簇。 H+离子辐照表面维氏体的初始还原表明，网状结构消失，直径2-3nm的小铁颗粒留在表面。测得磁铁矿的介电常数和磁导率在微波2.45GHz附近具有最大值。将约10g碳复合球团用3kW微波加热至1370℃5min，制得生铁。温度升高的速率取决于球团的重量而不是铁粉的直径。生铁的杂质浓度比高炉生产的生铁低十分之一。对铁矿石和焦粉混合物微波连续炼铁工艺进行了研究。指出了绝缘体吸收微波和微波能资源吸收效率低两个问题。提出了新型微波炉。一种是微波束集中在炉中心的炉子，另一种是回转窑式微波炉。较少的