| Ladle Furnace(LF) is a ladle refining furnace production technology mainly based on heating, argon-blowing stirring and slag refining. This technology can make high-quality steel. So LF refining technology has developed rapidly in China in recent years. Currently, the study of LF is focused on two aspects:the research on the mathematical model of Argon-blowing at lable bottom; the study of refining slag and the optimization of refining process.According to some problems in a LF in Tonghuasteel, two aspects of the study about the optimization of LF technology were done as following:according to the actual process parameters about the LF furnace, the different argon flow were calculated; through laboratory research, the suitable refining slag, based on industrial waste residue, was prepared and tested.Main conclusions are as following:(1) Flow and mixing time has the trend of hyperbolic change, that is level of the mixing time reducing become lower with the gas rate increasing.(2) The refining slag has low melting point, melts rapidly, and has good ability of desulfurization. At the same time the amount of lime and the LF refining time can be reduced by using the refining slag.(3) By adding Aluminium bearing slag, the effects of started arc and submerged arc has been greatly improved, and the desulfurizing rate during tapping can be markedly improved by fully reducing the content of (FeO).(4) The phenomenon of the molten slag entrapment doesn't occur when argon flow is at 110l/min, which shows that the biggest argon blowing rate is appropriate at 110l/min.(5) The best alkalinity of the refining slag is between 2.0 to 2.5, and the best optical alkalinity is between 0.79 to 0.80, and the value of the best slag index MI is around 0.27 to 0.45.
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