1. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, Liaoning, China; 2. Iron and Steel Research Institute, Angang Group, Anshan 114009, Liaoning, China; 3. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China
Abstract：In order to investigate the influence of key parameters such as pre-sintering time and thickness distribution of upper and lower layers on double-layer pre-sintering process, basic research was carried out in the laboratory. The results show that when the thickness of total material layer and the pre-sintering time are determined, the distribution of upper layer and lower layer thickness determines the change of total sintering time. The total sintering time decreases firstly and then increases with the increase of lower layer thickness. And the total sintering time is the shortest when the thickness of upper layer is 350 mm and the thickness of lower layer is 650 mm. When the thicknesses of upper and lower layers are determined, the total sintering time decreases firstly and then increases, the utilization coefficient of sintering increases firstly and then decreases, drum strength increases, with the increase of pre-sintering time. The appropriate pre-sintering time should be controlled within 10-12 min. When two combustion zones exist in the material layer at the same time and the air pumping capacity is insufficient, the lower sinter contains a large amount of skeletons crystal structure, accompanied by some magnetite particles with horseshoe shape that is not completely reduced to wustite, this indicates that there is insufficient combustion. The above research results provide basic guidance for the improvement of the new process for double-layer pre-sintering.
WANG Y Z,ZANG J L,LIU Z J,et a1.Recent advances and research status in energy conservation of iron ore sintering in China[J].JOM,2017,69(11):2404.
[8]
TAKASHI M. Development of iron-making technologies in Japan[C]//Proceedings of the 5th International Congress on the Science and Technology of Ironmaking. Shanghai:The Chinese Society For Metals,2009:16.
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