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本文对钢水回磷进行了热力学计算和分析,得知EAF LF炼钢流程中钢水回磷的根本原因是熔池温度升高、炉渣氧化性减小和炉渣碱度降低,并针对宝山钢铁股份有限公司150tEAF炉冶炼钢管钢过程、定量计算了熔池温度、炉渣氧化性及炉渣碱度变化对钢水回磷量的影响。计算结果表明,在LF精炼的热力学条件下,渣中无磷存在;EAF下渣量及铁合金种类对LF精炼钢水回磷量也有影响,EAF每下渣100kg,钢水增磷0.00032%,锰铁合金的增磷作用大于硅铁合金。每加入1kg t锰铁合金使钢水增磷不少于0.0002%。由计算及分析可知,为防止钢水回磷必须密切关注EAF终点升温过程、严格控制EAF下渣量并采用低磷锰铁合金。
In this paper, the thermodynamic calculation and analysis of molten steel phosphorus were carried out. It is learned that the fundamental reason of molten steel phosphorus in EAF LF steelmaking process is that the temperature of the molten pool is increased, the oxidation of slag is reduced and the basicity of slag is reduced. Co., Ltd. 150tEAF furnace smelting steel pipe process, quantitative calculation of the molten pool temperature, slag oxidation and slag basicity changes on the amount of molten steel phosphorus. The calculated results show that there is no phosphorus in the slag under the thermodynamic conditions of LF refining. The amount of slag and the type of iron alloy in EAF also affect the amount of phosphorus in LF refining steel. Ferroalloy phosphorus is greater than ferrosilicon alloy. Each join 1kg t ferromanganese steel so that the phosphorus increase of not less than 0.0002%. It can be seen from the calculation and analysis that in order to prevent the molten steel from rephosphorizing, the EAF end-point heating process must be closely monitored, the slag quantity under EAF strictly controlled, and the low-phosphorus ferromanganese alloy should be adopted.