Research and application of top blowing technology for ladle under abnormal production conditions
In response to the problem of low or no bottom blowing during the gas permeability of the steel ladle at Ma Steel's 65 t converter after tapping,which cannot ensure the uniformity of the steel composition and temperature,and the temperature of the steel at the station after tapping is lower than the lower limit of the target range of the process requirements,which cannot meet the temperature requirements for normal casting of the casting machine,the goal of uniform steel composition and temperature is achieved by blowing argon gas to the top of the ladle and blowing oxygen to the top of the ladle.At the same time,SiFe and SiMn alloys are added,and oxygen reacts with the heating elements Si and Mn to release heat,achieving the goal of online rapid temperature increase of low-tem-perature steel.Production practice has shown that using silicon iron alloy(containing 72.5%silicon)and silicon manganese alloy(containing 18.64%silicon and 66.6%manganese)as heating agents,with an oxygen pressure of 1.2 MPa,a flow rate of 1200 Nm3/h,and an oxygen blowing time of 5 minutes,the average heating rate is 3.55℃/min.The average burning loss rates of the heating elements Si and Mn in the steel are 0.014%/min and 0.022%/min,respectively.The top blowing process of the ladle provides an important guarantee for the smooth and efficient smelting of the converter,and has achieved good results in use.
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