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Numerical investigation of basic oxygen furnace slag modification with gas bottom-blowing and SiO_(2) modifier

Journal of Iron and Steel Research International 2023年第7期30卷 1451-1460页

作者： Chang Liu Yu-feng Tian Yong-li Xiao Yong-qian Li Yang Li Guang-qiang Li Qiang Wang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina Ruipu Technology Group Co. Ltd.Lishui 323900ZhejiangChina Central Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201900China

To avoid the volume expansion of basic oxygen furnace (BOF) slag for use in building materials, a hot slag modification process was proposed to reduce free cao (f-cao) in the molten slag. A transient 3D numerical model of BOF molten slag modification by SiO_(2) particles was established. The flow and heat transfer of molten slag, movement and dissolution of the modifier, and concentration distribution of f-cao in slag during the modification of BOF were studied. The distribution of f-cao concentration is inhomogeneous all over the molten slag. The mixing effect at the slag surface is weaker than that at the half-height plane of the slag. To consume the f-cao below 2.0 wt.% in the slag, the optimum quantity of the SiO_(2) modifier is 10.0% of the mass of the slag. The fine SiO_(2) particles help attain a lower final mass fraction of f-cao and a higher SiO_(2) utilization ratio.

关键词： Basic oxygen furnace slag modification SiO_(2)modifier free cao Discrete phase model Computational fluid dynamics

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High-temperature modification and air-quenching granulation of steel slag

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Journal of Iron and Steel Research International 2022年第5期29卷 783-792页

作者： Hui Wang Chao Liu Hong-wei Xing Jin-hu Wu Wen-long Lin Shuo Li Guo-hui Ding Yu-zhu Zhang College of Metallurgy and Energy North China University of Science and TechnologyTangshan063200HebeiChina Steelmaking Operation Department Shougang Jingtang United Iron&Steel Co.Ltd.Tangshan063200HebeiChina

To solve the problem of difficult utilization of steel slag,the liquid steel slag was modified and the air-quenching granulation process was carried out to make steel slag into a value-added end product:air-quenching granulated steel *** granulated slag was tested to analyze the variation rule of slag properties under different modification *** on the phase diagram of cao–Si_(2)O–FeO–MgO–Al2O3 slag system,the feasibility of blast furnace(BF)slag as modifier was *** the addition of BF slag was increased from 0%to 35%,following results were *** slag fluidity was improved,and the air-quenching temperature range was ***,the yield of air-quenched steel slag increased,while the granulation rate,the degree of sphericity,the compactness were ***,the air-quenching granulation process could substantially improve the stability and the amorphous content of steel *** maximum removal rate of free cao was above 80%and the amorphous content was up to 95%.Taking the factors of yield and properties of granulated steel slag into full consideration,the optimum proportion of BF slag is around 15%.

关键词： Steel slag Modification Air-quenching granulation free cao Amorphous Property

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