Fundamental Study On Adsorption Behavior Of Inclusions In Liquid Steel Effected By Rod Structure

Stopper of rod-type,a new method of inclusions removal,generated new ideas for improving the cleanliness of liquid steel.In order to analyze the adsorption behavior of inclusions effected by rod structure,physical adsorption model among liquid steel,condensed state inclusions and adsorption rod,as well as evaluation model of adsorption capacity were built.Chemical adsorption between inclusions and refractory was stimulated through high temperature experiment.Theoretical studies showed that transition trajectory of inclusions in the turbulent swirl was helical cone.Inclusions were grouped by the fuzzy clustering method.For the dominant areas,the stokes collision was the condensed matter inclusions which range of sizes were between 1 to 1.25μm and 10 to 25μm,1 to 1.85μm and 25 to 30μm,1 to 5μm and 30 to 50μm,1 to 16.5μm and 50 to 1000μm.While the turbulence collision was between 1 to 100μm and 1 to 10μm.The common dominant area of them was 50.8 to100μm and less than 1μm.Condensed state inclusion occurred collision with a probability of(S+Smax-r)/(a+r).And the maximum displacement of inclusions smaller than 50μm in the period of 0.02 s was 36μm,the magnitude of adhesion was 10-4.The thermal experiments showed that when groove direction plumbs to the rotation direction,the reduction of the number of inclusions was 3mm>6mm>2mm>1.5mm,the optimum groove depth was 3mm,the maximum adsorption layer thickness and adhesion rate were 362.87μm and 0.1877μm·s-1 respectively.On the contrary,the variation was6mm>1.5mm>3mm>2mm,the optimum groove depth was 2mm,the maximum adsorption layer thickness and adhesion rate were 404.29μm and 0.2246μm·s-1respectively.The distribution showed that inclusions less than 5μm were in the middle and follows bottom <middle <top.While inclusions from 10μm to 15μm were in the side,in them greater than 10μm were same as the middle,less than 10μm followed top<middle <bottom.In addition,adsorption capacity of adsorption rod was evaluated and regression equation was gained by multiple regression model.