Erosion Mechanism And Furnace Profile Of 1# Converter Furnace Lining In Rare Earth Steel Plate Factory

The irregularity of erosion change in converter profile is one of the key problems affecting the smelting process.It is also one of the important research topics of converter smelting at home and abroad.The main reason is that the change of converter type will lead to slagging difficulty and uneven reaction in the process of smelting,resulting in long time of converter iso-sample.In the process of iso-sample,not only the erosion of converter body is aggravated,but also the temperature drop in converter is too large,the tapping temperature of converter is reduced,and the cost of steelmaking is increased.Such problems also exist in Baotou Steel Rare Earth Plate Plant,which are mainly manifested in the serious corrosion of molten pool in the mid-term of converter campaign and the prone to breakout;serious corrosion at tapping side and phosphorus recovery from slag during tapping process;irregular furnace shape deteriorates the dynamic conditions of metallurgical reaction,resulting in uneven composition and temperature in the furnace.In view of the above problems in RE steel plant,this paper summarizes the practical experience of No.1 converter in RE steel plant in slag splashing protection and furnace maintenance,and makes some new attempts and experiments on how to maintain the new proposition of serious corrosion of the annular seam of the converter molten pool.Based on the characteristics and mechanism of corrosion of converter lining under the conditions of molten iron and scrap steel in rare earth steel plant,and according to the existing slagging mode of converter in Baotou Steel Rare Earth Steel Plant,the reasonable parameters of slag splashing protection for converter are determined,including the amount of slag splashing material,slag splashing time,slag splashing lance position,etc.Control the thickness of converter lining quantitatively so as to achieve the purpose of controlling furnace type;adopt new technology of feeding and protecting furnace,organize the maintenance work of converter body reasonably,can more accurately feed the feeding material to the required position;adopt static model control of metallurgical process and dynamic control technology of sub-lance to improve the hit rate of smelting end point.Through the above process control,the once drawing rate of converter in rare earth steel plant reaches 92%,which can effectively reduce the erosion of supplementary blowing to the furnace body.By optimizing the slag splashing operation,the slag splashing lance position of converter is determined to be controlled at 800-2500 mm,and the slag splashing time is more than 60 seconds,which can ensure the slag splashing effect of the ring seam and avoid the steel leakage accident.The lowest point increased from 448 mm to 709 mm,and the lowest point of converter bottom increased from 603 mm to 653 mm.Gradually,the converter type returned to normal.It has good metallurgical effect.This can shorten the non-smelting process time,improve the operation rate and thermal efficiency of converter,reduce the cost of converter smelting better,and is of great significance to improve the capacity of large converter.