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Effective Utilization in Resources with Simultaneous Synthesis of Iron Carbide and Rutile by Thermochemical Reactions of Ilmenite Ore

钛铁矿热化学反应同时合成碳化铁和金红石的资源有效利用

基本信息

批准号：
12650732
负责人：
HAYASHI Shoji
金额：
$ 2.3万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650732/
关键词：
Ilmenite Ore Rutile Iron carbide Effective Utilization in Resources Titanium industry Steel industry

项目摘要

The titanium industry consists of paint pigments and metallic products. As their main feedstocks, natural rutile (TiO_2) and ilmenite ore (FeTiO_3) are known. In the future it is supposed that the latter has a potential to be useful as the main resource because the former is diminishing.In the present work, we have tried to produce both iron carbides and rutile (TiO_2) from ilmenite ore by utilizing pyrometallurgical reactions between solids and reducing gas, imaging that both products could be subsequently separated by any means. Iron carbide is recently focused as an alternative iron source to steel scrap. If this process is operated successfully, it could supply both valuable titanium and ferrous materials simultaneously into each industry and generate benefits from wastes. As for iron carbide, we have reported several papers in which it was proved that traces of sulfur in reaction gas makes iron carbides more stable without any soot precipitation from many types of iron ores.Natura … More l ilmenite ore (Quilon, Kerala, India. Main mineral : FeTiO_3) was employed for reaction tests.Finally, this research was concluded as the followings.Simultaneous synthesis of iron carbides (mainly cementite Fe_3C_2, θphase) and rutile (TiO_2) from natural ilmenite ore (mainly FeTiO_3) were investigated by thermochemical reactions with H_2-CO or H_2-CH_4 gas mixtures having low sulfur pressures incapable of forming FeS at the temperatures of 1073-1273K.For the ilmenite samples it was confirmed that traces of sulfur in both gas mixtures produce iron carbides stably without free carbon, analogous to our previous results obtained for iron ores.In the first stage, partial conversion from ilmenite to rutile and metallic iron proceeded and then iron carbidization occurred with further reduction of rutile. Both gas mixtures provided iron carbide and lower titanium oxides such as Magneli phases (Ti_nO_<2n-1>, 4≦n≦9, namely TiO_<2-x> ) and/or Ti_3O_5 rather than rutile during the later stages.Ti_3O_5 andTi_4O_7 phases tended to exist with increasing temperatures rather than TiO_2 Only Ti_4O_7 was identified as one of the Magneli phases. Less

钛工业包括油漆、颜料和金属制品。其主要原料为天然金红石（TiO_2）和钛铁矿（FeTiO_3）。在未来，人们认为后者有可能成为有用的主要资源，因为前者正在减少。在目前的工作中，我们试图利用固体和还原性气体之间的火法冶金反应从钛铁矿矿石中生产碳化铁和金红石（TiO_2），并认为这两种产品随后可以用任何方法分离。碳化铁作为废钢的替代铁源近年来备受关注。如果该工艺操作成功，它可以同时为每个行业提供有价值的钛和铁材料，并从废物中产生效益。至于碳化铁，我们已经报道了几篇论文，其中证明了反应气体中痕量的硫使碳化铁更稳定，而不会从许多类型的铁矿石中析出任何烟尘。更多钛铁矿（Quilon, Kerala, India）反应试验采用主要矿物：FeTiO_3。最后，本研究的结论如下：以天然钛铁矿（主要为FeTiO_3）为原料，在1073 ~ 1273k温度下，与低硫压力的H_2-CO或H_2-CH_4混合气体进行热化学反应，制备了碳化铁（主要为渗碳体Fe_3C_2， θ相）和金红石（TiO_2）。对于钛铁矿样品，证实了两种气体混合物中痕量的硫稳定地产生没有游离碳的碳化铁，类似于我们以前对铁矿石的结果。在第一阶段，钛铁矿部分转化为金红石和金属铁，然后随着金红石的进一步还原发生铁渗碳。这两种气体混合物在后期都提供碳化铁和较低的钛氧化物，如Magneli相（Ti_nO_<2n-1>, 4≦n≦9，即TiO_<2-x>）和/或Ti_3O_5，而不是金红石。随着温度的升高，Ti_3O_5和Ti_4O_7相的存在比TiO_2相更明显，只有Ti_4O_7是Magneli相之一。少