炼钢造渣物料高温热焓值的试验测定

为确切了解转炉炼钢过程中各种物料的加入给炼钢熔池温度带来的影响，对影响熔池温度的造渣材料的热焓值进行了测定。结果表明，各种物料在炼钢温度下的吸热程度不同，石灰、轻烧白云石、镁球的吸热温度区间为350~500℃，每吨物料的温降分别为4.8、6.6和5.6℃；石灰石的吸热温度为726℃，每吨物料的温降为7.9℃；烧结矿、废钢、炉渣的吸热温度为1300~1400℃，每吨物料的温降为5.6、1.4和1.1℃。根据测定结果，结合铁水成分和现场实际数据，预测转炉终点钢水温度的模型，为提高转炉终点钢水温度精确控制和优化工艺参数提供依据。

Experimental determination of the high temperature enthalpies value for slag forming materials in steelmaking

In order to study the influence of heat change for slag forming materials on the BOF bath temperature dur-ing steelmaking,the enthalpies value of slag forming materials was tested.The results show that there was different heat absorption degree in steelmaking temperature.The endothermic temperature range of lime,light-burned dolo-mite and magnetic pellet was between 350 and 500 ℃,which brought the temperature drop of bath being respectively 4.8,6.6 and 5.6 ℃ per ton of materials.The endothermic temperature range of limestone is 726 ℃ and the temper-ature drop of bath was 7.9 ℃ per ton of materials.The endothermic temperature range of sintered ore,steel scrap and slag was between 1 300 and 1 400 ℃ and the temperature drop of bath was respectively 5.6,1.4 and 1.1 ℃ per ton of materials.According to the above test results,the hot metal chemical composition and the addition amount of slag forming materials,the prediction model of molten steel temperature at the BOF endpoint was taken,which pro-vides evidence for accurate control of the BOF endpoint temperature and optimization of the process parameters of BOF.