Study On Interface Reaction Of Active Lime In Steelmaking Slag

With the rapid development of industrial technology and strict requirement for thequality of steel, iron and steel industry has been from extensive operation into fineoperation. Active lime is the important slagging flux in the steelmaking. There is animportant significance to reduce costs and improve quality of steel by studying on theinterfacial reaction of activity lime in steelmaking slag process.In the experiment, the preparation of lime was studied. The activity degree andmicrostructure of the lime were determined and analyzed. Steelmaking reactions werepredicted by using HSC Chemistry software. And in the experiments of steelmaking andslagging, the influence of interfacial reactions in the slagging process of the lime wasanalyzed by adopting different factors. Specific contents and results are as follows:Firstly, the preparation of active lime under different conditions and thedetermination of activity degree were studied. Under the conditions of0.15MPa for thepressure,120min for holding time and1200℃for the heating temperature, active degreewas the best and its value was437ml. There was the close relation between the activitydegree of lime and its microstructure. And there were the influence and restrict amongthe microstructural parameter.Secondly, in the process of steelmaking and slagging the reactions and its productswere predicted. In this process, there was a series of reactions."Three high and one low"was conducive to dephosphorization reactions.Finally, the experiments of steelmaking and slagging were done. Dephosphorizationreactions were studied under the conditions of different slagging flux, different quantityof slag and different lime. The dephosphorization rate of slagging flux containing Fe2O3was obviously on the high side. Both over high and over low amount of slag were nothelpful to the interfacial reactions. The best slag rate of NO.1slagging flux was1:80. Thebest slag rate of NO.2slagging flux was1:50. The dephosphorization effect was the bestunder the conditions of2.5m2/g for pore area,0.45~0.55ml/g for pore volume,750~850nm for average pore size and2.0g/cm3for volume density.