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Influence of initial iron ore particle size on CO2 gasification behavior and strength of ferro-coke

Journal of Iron and Steel Research International 2020年第8期27卷 875-886页

作者： Run-sheng Xu Shu-liang Deng Heng Zheng Wei Wang Ming-ming Song Wei Xu Fang-fang Wang State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Chair of Metallurgy Montanuniversitat LeobenLeoben A-8700Austria Wuhan Iron and Steel Co. Ltd.Wuhan 430081HubeiChina School of Energy and Power Engineering Beihang UniversityBeijing 100191China Ningbo Institute of Technology Beihang UniversityNingbo 315800ZhejiangChina

Highly reactive ferro-coke has been widely studied due to its contribution to the energy saving and emission reduction in blast furnace ironmaking. To optimize the coking process of ferro-coke and improve its metallurgical properties, it is necessary to clarify the influence of initial iron ore on the strength, micro-morphology and CO2 gasification reaction behavior of formed ferro-coke. The effects of initial iron ore particle size (0.50–1.00, 0.25–0.50 and 0.074–0.125 mm) on the CO2 gasification reaction of ferro-coke were analyzed using thermo-analysis technique. In addition, the effects of initial iron ore particle size on the strength and morphology of ferro-coke were investigated by drum test, digital microscopy and scanning electron micro-scopy. The results show that iron reduced from iron ore has a great promotion effect on the CO2 gasification reaction of ferro-coke. The smaller the particle size of initial iron ore, the more intense the gasification reaction, and the lower the starting temperature for gasification reaction of ferro-coke. The results of kinetic calculation show that the apparent activation energy of ferro-coke decreases with the decreasing particle size of blended iron ore. The particle size of initial iron ore has a great impact on the strength of ferro-coke. The ferro-coke prepared by 0.25–0.50 mm iron ore presents the best strength in this experiment.

关键词： ferro-coke Iron ore Particle size Strength Gasification reaction

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Properties of ferro-coke and Its Effect on Blast Furnace Reactions

Properties of Ferro-coke and Its Effect on Blast Furnace Rea...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Li Peng Bi Xuegong Zhang Huixuan Shi Shizhuang Cheng Xiangming Ma Yirui Wu Qiong The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Hubei Coal Conversion and New Carbon Materials Key Laboratory Wuhan University of Science and Technology

The reactivity of ferro-coke is much higher than the conventional coke and its application to the blast furnace is expected to improve the blast furnace reactions efficiency and to reduce fuel consumption and ***-coke could thus be a new kind of BF burden materials with broad development *** order to under the effect of using ferro-coke on BF reactions,a series of laboratory tests has been conducted in this ***,ferro-cokes were made in a laboratory cokemaking oven of chamber type by adding three kinds of iron ores into the cokemaking coal blend and the ferro-cokes with higher reactivity as well as comparatively high strength after reaction were chosen as experimental samples for the further ***,the carbon solution loss reaction tests,the coupled reactions tests between iron ore reduction and ferro-coke gasification,and the primary slag formation tests under the condition of ferro-coke and iron ores mixed charging and simulating blast furnace conditions were carried *** experimental results showed the gasification reaction beginning temperature of ferro-coke is obviously lower than that of the conventional coke,that ferro-coke mixed charging is more effective than nut coke mixed charging in terms of accelerating iron ore reduction,and that ferro-coke mixed charging can decrease the melt-down temperature as well as the pressure drop of stock column and narrow down the softening-melting range,which are beneficial to the improvement of blast furnace performance.

关键词： ferro-coke high reactivity iron ores reduction primary slag formation

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Synergistic reaction behavior of pyrolysis and reduction of briquette prepared by weakly caking coal and metallurgical dust

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Journal of Iron and Steel Research International 2023年第7期30卷 1367-1380页

作者： Zheng-jian Liu Ming-hui Cao Jian-liang Zhang Run-sheng Xu Yao-zu Wang Ji-yong Yu Yu-chen Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Co-carbonization of weakly caking coal and zinc-containing dust to prepare highly reactive ferro-coke and collaboratively recover zinc powder is one of the feasible ways for steel enterprises to recycle zinc-containing *** pyrolysis mass loss behavior of adding blast furnace dust with different zinc contents to different ferro-coke materials was systematically studied by thermogravimetry and differential thermogravimetry analysis,and the kinetic mechanism of pyrolysis-reduction reaction of hybrid briquette was *** results of thermogravimetric curve analysis show that the addition of zinc oxide to the sample has no significant effect on the mass loss rate of the sample below 580℃,and the pyrolysis mass loss of zinc oxide mainly occurs between 800 and 1000℃.Kinetic analysis results show that the pyrolysis of zinc-containing samples is controlled by chemical reactions below 580℃.The reaction at 580–700℃ is controlled by the nucleation and growth model,and that above 700℃ is mainly controlled by *** results of X-ray diffraction analysis show that the pyrolysis process can effectively remove zinc oxide from ferro-coke.

关键词： Zinc-containing dust Weakly caking coal ferro-coke Pyrolysis Reduction Thermal reaction analysis Kinetic analysis

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