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Zhang Y.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Li F.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Wang R.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Tian D.,Baosteel
Steel Research International | Year: 2016

Bayer red mud is characterized by its highly oxidizing nature (high Fe2O3 content) and high alkalinity (high Na2O content). It can work as an ideal flux and dephosphorizer in the steelmaking process. In this study, laboratory experiments on the use of Bayer red mud-based flux in hot metal dephosphorization and simulated steelmaking processes have been carried out. In hot metal dephosphorization, good slag fluidity and a much better separation between the slag and the melt phases are obtained while using Bayer red mud. This result is attributed to the fact that Al2O3 and Na2O present in Bayer red mud act as a flux and serve to decrease the melting point of the CaO-FeO-SiO2-based slag. For a mass ratio of Bayer red mud:CaO between 1:1 and 2:1, high hot metal dephosphorization ratios (more than 80%) and low final [P] (lower than 0.018%) are obtained. The experimental results obtained while using Bayer red mud-based flux in simulated steelmaking processes show that good slag fluidity is observed during the entire process. The dephosphorization ratio can be more than 85%, and the final [P] can be lowered to less than 0.005%. No rephosphorization phenomenon is observed in the whole experiment. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Du G.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Li J.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Wang Z.-B.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Shi C.-B.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China
Steel Research International | Year: 2016

Behavior of collision and agglomeration between solid inclusion particles MgO·Al2O3 and Al2O3 on H13 molten steel surfaces is observed in situ through a confocal scanning laser microscope (CSLM) equipped with a gold image furnace, and the attractive force between these solid inclusions is calculated by using Newton's second law. Results and analysis show that the attractive force between alumina particles in H13 steel without magnesium is stronger than that between MgO·Al2O3 particles in H13 steel containing magnesium, and the action radius of attractive force between alumina particles is larger than that between MgO·Al2O3 particles. MgO·Al2O3 particles have a much weaker tendency to collide, agglomerate, grow, and form clusters than alumina particles in H13 steel. Therefore, the collision, agglomeration and growth of inclusions, as well as the formation of clusters in H13 steel can be effectively impeded by the adding of magnesium. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Xin W.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Song B.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Song M.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China | Song G.,State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijing100083China
Steel Research International | Year: 2015

In order to depress the embrittlement induced by grain boundary segregation of arsenic in steel, the effect of Ce addition on the formation of arsenious inclusions and arsenic concentration at grain boundaries were systematically investigated in iron melts. The results showed that different types of arsenious rare earth inclusions were formed with different Ce content. As Ce content increased from 0.037 to 0.095wt%, the dominant inclusion in the melt was changed from the Ce-S-O inclusion fully coated by Ce-S-As inclusion to the Ce-S-As inclusion completely covered by Ce-As inclusion. Simultaneously, the single Ce-S-As and Ce-As inclusions were also detected when Ce content was more than 0.055wt%. The amount and average size of inclusions increased with increasing Ce content. Transmission electron microscope analysis indicated that the Ce-As inclusion was the CeAs phase, which was formed during solidification process. Furthermore, concentration of arsenic on grain boundaries after adding Ce was decreased to the level of the matrix. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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