The influence of aluminum particle size and launch altitude on the movement trajectory of aluminum particles
In the secondary refining process,aluminum is one of the main materials for deoxidization and alloying of molten steel,but the density of pure aluminum is less than that of molten steel.Whether it can pass through the contact between slag layer and molten steel and the contact time have a direct impact on the deoxidization effect of aluminum and the content of dissolved aluminum in steel.In this paper,the three-dimensional motion mathematical model of aluminum particles in gas-slag-steel is established by analyzing the force of aluminum particles during the movement process,ignoring the melting,dissolution and chemical reaction of aluminum.The influence of aluminum particle size and launch altitude on the trajectory of aluminum particles is clarified.The results show that when the slag layer thickness is 70 mm and launch altitude is 1-1.5 m,the aluminum particles of 1 mm and 5 mm fluctuate at the slag-metal interface.When launch altitude is 1 m,the aluminum particles with a particle size of 10 mm stay at the slag-metal interface,but they can enter the molten steel when launch altitude is 1.5 m or above.Aluminum particles of 20 mm and above can enter the molten steel.When launch altitude is 1 m,the residence time and depth of 30 mm aluminum particles in molten steel increase by 22.86％and 50.00％respectively compared with 20 mm.When the aluminum particle size is 20 mm,the residence time and depth of aluminum particles in molten steel increase by 5.71％and 10.00％respectively on the basis of 1 m when launch altitude is 1.5 m.Increasing the steel slag interfacial tension,reducing the steel-aluminum interfacial tension or increasing the slag-aluminum interfacial tension is beneficial to the entry of aluminum particles into the molten steel.When the size of the aluminum particles is greater than 20 mm,and the interfacial tension has little effect on the movement of the aluminum block.Increasing the specific gravity will make the steel core aluminum stay in the molten steel for a longer time,which is beneficial to the deoxidization of the molten steel.
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