为了研究含纳米 CaCO3的镁钙质中间包涂料在冶炼过程中对钢水中 Mn、C 和总氧含量的影响，按90％（w）电熔镁砂和10％（w）纳米 CaCO3并外加2％（w）的 SiO2微粉制成镁钙中间包涂料，并浇注成坩埚试样，自然养护24 h 后于200℃下烘烤24 h，然后将盛有锰钢的镁钙质坩埚放入感应炉中，抽真空后通入氩气并保持氩气流动，随后将炉温升至1100℃保温50 min，再继续升温至1600℃使钢样熔化，然后每隔一段时间对钢水取样，检测钢样的 Mn、C 和总氧含量，同时对试验后坩埚制样进行电镜和能谱分析。结果表明：在冶炼过程中，钢水中 Mn、C 含量降低，总氧含量增加，这与纳米 CaCO3分解产生的 CO2与钢中 Mn、C 元素的反应有关。
In order to investigate the influence of nano-CaCO3 containing MgO-CaO coatings for tundish on Mn,C and total oxygen contents of Mn steel,MgO-CaO crucible specimens were prepared casting the mixture of 90 mass% fused magnesia and 10 mass% nano-CaCO3 ,extra 2 mass% SiO2 micropowder,nat-ural curing for 24 h and then baking at 200 ℃ for 24 h.The crucible specimens with Mn steel were trans-ferred in an induction furnace.After vacuuming,blowing the flowing argon atmosphere,the furnace was heated to 1 100 ℃ and held for 50 min firstly and then heated to 1 600 ℃ till the steel was melted.The mol-ten steel was sampled at regular intervals,the Mn,C and total oxygen contents were determined,and the crucible after test was investigated by SEM and EDS.The results show that Mn and C contents in molten steel decrease,and the total oxygen content increases,due to the interactions between Mn,C and CO2 gas from the decomposition of nano-CaCO3 .
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