KR工序铁水预脱硅工业试验研究

摘要

The hot steel which contains lower silicon is the goal in the converter process. Because of the limitation of the raw material conditions and blast furnace operation conditions, it is unstable that [Si] in hot metal in converter steelmaking. The KR industrial desiliconization were test using hot metal desulphurization equipment in the steel-making plant of Laigang. The 0.25%-0.35% range of the target [Si] is determined in the experiment. Using new type of silicon removal agent, the efficiency of desiliconization and deoxygenation are more than 70%. And the consumption of desiliconized agent of removing 0.1% [Si] is 9.85 kg/t. The main sections in the process which influences the efficiency of KR removal is the basicity of the desiliconization slag, the temperature of hot metal and the speed of feeding. By analysis, the basicity of the slag is 0.5-0.8, the temperature of the starting metal is over 1 350 ℃, and the rate of feeding is 3.5-4.5 kg/s.%莱钢炼钢厂利用KR脱硫设备进行了铁水预脱硅工业试验，试验确定铁水目标[Si]为0.25%～0.35%。采用新型脱硅剂，脱硅氧效率达70%以上，脱除0.1%[Si]脱硅剂消耗量为9.85 kg/t。影响KR脱硅效率的主要是脱硅渣碱度、铁水温度和加料速度。分析认为，合适的脱硅渣碱度为0.5～0.8，脱硅起始铁水温度为＜1350℃，脱硅剂加料速度为3.5～4.5 kg/s。