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Recent Advances in Iron Ore Sintering in NSSMC

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Recent Advances in Iron Ore Sintering in NSSMC

Characterization of Surface Oxide Layers on Black-Colored Titanium

“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Kenichi Higuchi Masaru Matsumura Osamu Ishiyama Seiji Nomura Process Research Laboratories Nippon Steel ＆ Sumitomo Metal Corporation

Sintering is the most economic and widely used agglomeration process to prepare iron ore fines for blast furnace use.Due to the depleting reserves of traditional high grade iron ore,there have been considerable changes in iron ore resources available throughout the world,especially in steel mills in East Asia.Corresponding to the changes in the availability of iron ore resources,the amount of impurities in iron ore has been slowly increasing.Some of these impurities have been found to have deleterious impacts on sinter quality and sintering performance.In the mean time,an increasing number of large blast furnaces with inner volumes of more than 5000 m3have been built,which require more sinter and are often more demanding in terms of the quality requirements of the ferrous materials.Finally,sinter plants are facing increasing pressures and more stringent regulations regarding their environmental impact.This paper gives an overall review of a variety of technologies developed worldwide to tackle the changing raw material characteristics and mitigate emissions from sintering operations.

关键词： agglomeration granulation blast furnace ironmaking

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Journal of Surface Engineered Materials and Advanced Technology 2018年第4期8卷 71-82页

作者： Michio Kaneko Kiyonori Tokuno Kazuo Yamagishi Takao Wada Tsuyoshi Hasegawa steel Research Laboratories Nippon Steel and Sumitomo Metal Corporation Shintomi Futtsu Japan Head Office Nippon Steel and Sumitomo Metal Corporation Tokyo Japan Toyo Rikagaku Kenkyusho corporation Tsubame Niigata Japan

Black-colored titanium was obtained by anodic oxidation of a commercially pure grade-1 titanium sheet in a 0.06 M NH4NO3 solution, followed by heat treatment at 773 K for 1 h in a vacuum furnace. The resulting oxide layer on the titanium substrate was examined by X-ray photoelectron spectroscopy, X-ray diffraction, glow discharge spectroscopy, and scanning electron microscopy. It was found that the oxide layer on the black-colored titanium sheet was several micrometers thick and mainly consisted of rutile TiO2 exhibiting a sponge like nanoporous structure. It is considered that the black-colored appearance of the titanium sheet is due to the sponge like nanoporous structure of the oxide layer absorbing the incident light. The photocatalytic activity of the black-colored titanium sheet was examined by observing the decomposition of a methylene blue (MB, C16H18N3SCl) solution under ultraviolet irradiation due to the existence of rutile TiO2. The sheet also exhibited photocatalytic activity under visible light irradiation. It is believed that the photocatalytic response upon irradiation with white light is due to carbon doping of the titanium oxide layer on the titanium substrate.

关键词： Titanium Titanium Oxide Titanium Dioxide Rutile Photocatalyst Visible Light Response Nanoporous Structure

Photocatalytic Activity of Titanium Dioxide Powder Fabricated from an Anodized Titanium Sheet under Ultra-Violet and Visible Light Irradiation

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Journal of Surface Engineered Materials and Advanced Technology 2017年第1期7卷 13-23页

作者： Michio Kaneko Kiyonori Tokuno Kazuo Yamagishi Takao Wada Tsuyoshi Hasegawa steel Research Laboratories Nippon Steel and Sumitomo Metal Corporation 20-1 Shintomi Futtsu Japan Head Office Nippon Steel and Sumitomo Metal Corporation Tokyo Japan Toyo Rikagaku Kenkyusho corporation Niigata Japan

A commercially pure titanium sheet with titanium carbide (TiC) precipitated in its surface layer was anodized in NH4NO3 aqueous solution and heat treated in air. The photocatalytic activity of titanium dioxide powder collected from the surface of the anodized titanium sheet was evaluated under ultra-violet and visible light irradiation. It showed relatively high photocatalytic activity in 0.1 mol/l potassium iodide solution, which was almost equal to the activity level of TiO2 powder (P-25) manufactured by Degussa corporation. The better photocatalytic activity under ultra-violet irradiation is considered to be related to the formation of anatase type titanium dioxide. Photocatalytic activity under visible light irradiation was also observed, which was considered to be attributable to impurity doping, (carbon), in the titanium dioxide powder.

关键词： Photocatalysis Titanium Titanium Dioxide Powder Anodic Oxidation Ultra-Violet Visible-Light Response

Photocatalytic Activity of Anodized Titanium Sheets under Ultra-Violet and Visible Light Irradiation

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Journal of Surface Engineered Materials and Advanced Technology 2014年第6期4卷 369-378页

作者： Michio Kaneko Kiyonori Tokuno Kazuo Yamagishi Takao Wada Tsuyoshi Hasegawa steel Research Laboratories Nippon Steel and Sumitomo Metal Corporation Futtsu Japan Head Office Nippon Steel and Sumitomo Metal Corporation Tokyo Japan Toyo Rikagaku Kenkyusho corporation Niigata Japan

A commercially pure titanium sheet precipitated TiC in the surface layer was fabricated by anodic oxidation in NH4NO3 solution and heat treatment in air. The fabricated sheet showed relatively high photocatalytic activity in 0.1 M KI solution, which was close to the activity level of the P-25 particle made by Degussa corporation. It exhibited photocatalytic activity in antifungal and antivirus tests under black light irradiation. The better photocatalytic activity under black light irradiation is considered to be related to the formation of anatase and rutile type titanium dioxides and rough surface. It also showed photocatalytic activity under visible light irradiation, which is considered to be attributable to carbon and nitrogen doping in titanium dioxide.

关键词： Photocatalysis Titanium Dioxide Anodic Oxidation Visible-Light Response Carbon-Doping

Biological removal of selenate in saline wastewater by activated sludge under alternating anoxic/oxic conditions

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Frontiers of Environmental Science & Engineering 2019年第5期13卷 39-49页

作者： Yuanyuan Zhang Masashi Kuroda Shunsuke Arai Fumitaka Kato Daisuke Inoue Michihiko Ike Division of Sustainable Energy and Environmental Engineering Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan nippon steel & sumitomo metal corporation 20-1 Shintomi Futtsu Chiba 293-8511 Japan

Selenium (Se)-containing industrial wastewater is often coupled with notable salinity. However, limited studies have examined biological treatment of Se-containing wastewater under high salinity conditions. In this study, a sequencing batch reactor (SBR) inoculated with activated sludge was applied to treat selenate in synthetic saline wastewater (3% w/v NaCl) supplemented with lactate as the carbon source. Start-up of the SBR was performed with addition of 1–5 mM of selenate under oxygen-limiting conditions, which succeeded in removing more than 99% of the soluble Se. Then, the treatment of 1 mM Se with cycle duration of 3 days was carried out under alternating anoxic/oxic conditions by adding aeration period after oxygen-limiting period. Although the SBR maintained soluble Se removal of above 97%, considerable amount of solid Se remained in the effluent as suspended solids and total Se removal fluctuated between about 40 and 80%. Surprisingly, the mass balance calculation found a considerable decrease of Se accumulated in the SBR when the aeration period was prolonged to 7 h, indicating very efficient Se biovolatilization. Furthermore, microbial community analysis suggested that various Se-reducing bacteria coordinately contributed to the removal of Se in the SBR and main contributors varied depending on the operational conditions. This study will offer implications for practical biological treatment of selenium in saline wastewater.

关键词： Activated sludge Selenate reduction Saline wastewater Sequencing batch reactor Alternating anoxic/oxic conditions Selenium biovolatilization

Fischer–Tropsch synthesis on impregnated cobalt-based catalysts:New insights into the effect of impregnation solutions and pH value

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Journal of Energy Chemistry 2016年第6期25卷 994-1000页

作者： Chuang Xing Peipei Ai Peipei Zhang Xinhua Gao Ruiqin Yang Noriyuki Yamane Jian Sun Prasert Reubroycharoen Noritatsu Tsubaki School of Biological and Chemical Engineering Zhejiang University of Science and Technology Department of Applied Chemistry Graduate School of Engineering University of Toyama Advanced Technology Research 20-1 Laboratories Nippon Steel & Sumitomo Metal Corporation Dalian National Laboratory for Clean Energy (DNL) Dalian Institute of Chemical Physics Chinese Academy of Sciences Department of Chemical Technology Faculty of Science Chulalongkorn University

The Co-based catalysts were prepared with different cobalt acetate solutions. Effects of pH value were studied deeply on Fischer–Tropsch synthesis (FTS) through a semi-batch reactor. Among all impregnation solutions (water, butanol, amyl alcohol, acetic acid, nitric acid and ammonium nitrate), the catalyst prepared by NH4NO3solution showed the highest catalytic activity due to its small particle size and high reduction degree. However, the catalyst with the smallest particle size derived from water as impregnation solution exhibited low activity as well as high methane selectivity since it was difficult to be reduced and inactive in FTS. According to FT-IR spectra results, the low intensity of absorbed CO on the catalyst prepared from water solution resulted in low FTS activity. Whereas, the high activity of catalysts prepared from NH4NO3solution could be explained by the high intensity of absorbed CO on the catalysts. The cobalt species on the catalysts prepared under lower pH conditions exhibited smaller particle size distribution as well as lower CO conversion than those prepared at higher pH value. ? 2016 Science Press

关键词： Batch reactors Catalyst selectivity Catalysts Cobalt Impregnation Particle size Particle size analysis pH pH effects

Mixing of Density-Stratified Fluid in a Cylindrical Tank by a Diagonal Jet

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Journal of Energy and Power Engineering 2018年第9期12卷 436-443页

作者： Tomohiro Degawa Kota Uno Tomomi Uchiyama Institute of Materials and Systems for Sustainability Nagoya UniversityNagoya 464-8603Japan nippon steel&sumitomo metal corporation Tokyo 100-8071Japan

This study experimentally investigates the mixing of two-layer density-stratified fluid in a cylindrical tank by a diagonal jet.The upper and lower fluids are water and an aqueous solution of sodium chloride(NaCl),respectively,and the lower fluid issues from a nozzle on the tank bottom.The angle between the jet centerline and the tank bottom is 60°,and the mass concentration of the NaCl solution is 0.02.The mixing in cases that the Reynolds numbers of the jets are 713,2319,and 3565 is investigated.The velocity fields in the central vertical cross-section are measured with a PIV(particle imaging velocimetry)system by tracing nylon particles with the diameter of 80μm.The concentration fields in the section are visualized using Rhodamine B as the fluorescent dye.They are also measured using PLIF(planer laser induced fluorescence)from visualized images and the progresses of the mixing are evaluated quantitatively.The investigation clarifies the relationship between the mixing phenomena and the Reynolds number of the jet.

关键词： Jet density-stratified fluid mixing PLIF PIV

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高强度管线钢及其焊管的性能研究

焊管 2005年第2期28卷 50-60页

作者： Naoshi Ayukawa Yoshio Terada Takuya Hara Hitoshi Asahi nippon steel corporation Nippon Steel CorporationNippon Steel CorporationNippon Steel Corporation

目前X80级管线钢管已在大口径输送管线中得到应用,使得对进一步提高管线钢强度(X100～X120级)的需求也更迫切了.使用高强度管线钢目的是拟通过提高管道的输送压力来提高其输送效率和降低铺设管线费用.为将这两点期望变为现实,高强度管... 详细信息

目前X80级管线钢管已在大口径输送管线中得到应用,使得对进一步提高管线钢强度(X100～X120级)的需求也更迫切了.使用高强度管线钢目的是拟通过提高管道的输送压力来提高其输送效率和降低铺设管线费用.为将这两点期望变为现实,高强度管线钢管及其焊接热影响区(HAZ)应具备良好的低温韧性和现场焊接(环焊)性能,所以,必须综合应用合理的合金成分设计,超纯净冶炼,控轧、控冷(TMCP)等工艺,改善焊接热影响区工艺等多方面的技术和措施,以得到同时具备高强度、良好的低温韧性和现场焊接性能的管线钢.

关键词：高强度管线钢低温韧性焊接热影响区焊管控冷 TMCP 管线钢管现场焊接输送管线输送效率

Effect of SiO_(2)on loss of catalysis of inherent metallic species in CO_(2)gasification of coke from lignite

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Carbon Resources Conversion 2019年第1期2卷 13-22页

作者： Cheolyong Choi U.P.M.Ashik Shinji Kudo Kazuya Uebo Koyo Norinaga Jun-ichiro Hayashi Interdisciplinary Graduate School of Engineering Sciences Kyushu University6-1Kasuga KoenKasuga 816-8580Japan Institute for Materials Chemistry and Engineering Kyushu University6-1Kasuga KoenKasuga 816-8580Japan Process Research Laboratories Nippon Steel&Sumitomo Metal Corporation20-1ShintomiFuttsu 293-8511Japan Department of Materials Science and Engineering School of EngineeringNagoya UniversityNagoyaAichi 464-8601Japan Transdisciplinary Research and Education Center of Green Technology Kyushu University6-1Kasuga KoenKasuga 816-8580Japan

Inherent metallic species retained by coal char or coke,such as Na and Ca,behave as catalysts in gasification.The char/coke normally contains inherent SiO_(2),which can react with the inherent catalysts to form silicates,resulting in catalyst deactivation over the range of pyrolysis,carbonization and gasification,and thereby reducing the char/coke reactivity.The present authors simulated the inherent catalyst deactivation experimentally by blending a Victorian lignite with SiO_(2),briquetting the SiO_(2)/lignite blend,carbonizing the briquette,and then gasifying the coke with CO_(2).The kinetic analysis of the gasification employed a comprehensive model,which assumed progress in parallel of non-catalytic and catalytic gasification.The model quantitatively described the measured kinetics of the coke gasification with different SiO_(2)contents over a range of coke conversion up to 99.9%.The kinetic analysis revealed that the SiO_(2)deactivated substantial and entire portions of the most active catalyst and its precursor,respectively,before the gasification(i.e.,during the carbonization).The catalyst deactivation also occurred during the gasification,but mainly following a self-deactivation mechanism that involved no silicates formation.

关键词： Coke Lignite Reactivity CO_(2)gasification Inherent metallic species Catalyst Deactivation SiO_(2)