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Effect of quaternary basicity on reduction behavior of iron-bearing dust pellets

Journal of Iron and Steel Research International 2023年第7期30卷 1356-1366页

作者： Tao Yang Jing-shu An Xing-wang Li Shuang Liu Xu Gao Lei Ma Jie Lei Hong-ming Long School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction&Resources Recycling(Anhui University of Technology) Ministry of EducationMa’anshan 243002AnhuiChina

The treatment of iron-bearing dusts and sludges by the rotary hearth furnace process has the advantage of sufficient utilization of valuable metals and a high impurity removal rate,but the lower strength of the metallized product needs to be *** effects of quaternary basicity R4(w(CaO+MgO)/w(SiO_(2)+Al_(2)O_(3)))on the reduction behavior and physical and chemical properties of metallized pellets,including phase composition,compressive strength,microstructure and soft melting area,were investigated with FactSage thermodynamic software and *** strength of metallized pellets depended on the gangue composition,such as CaO,MgO,Al_(2)O_(3) and SiO_(2),due to the altered chemical composition,physical phase composition,microscopic morphology and stability of the slag *** reduction of carbon-bearing pellets was significantly promoted by suitable *** lower basicity(R_(4)1.8)also increased the amount of liquid phase and improved the strength of the pellets,due to the granular iron crystals bonded into ***,the main component of the liquid phase in high-basicity conditions was calcium *** the additional amount of liquid phase was beneficial to the strength of the metallized pellets,calcium disilicate was formed at R_(4)=1.6,resulting in a reduction in the compressive strength of the pellets to 1521.9 N/pellet.

关键词： Metallurgical solid waste Iron-bearing dust Iron-bearing sludge Rotary hearth furnace Quaternary basicity metallized pellet High-temperature performance metallized pellet High-temperature performance

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