摘要:
利用CaC2-CaF2对含铌钢液在碳管炉中进行了还原脱磷试验,钢液的碳含量wC=0.5%~1.9%,温度为1 550℃。研究了脱磷剂加入方式和加入量、铁水的含碳量、坩埚材质对脱磷率的影响。为了获得好的动力学条件,根据CaC2分解的特点,采用了将脱磷剂装入钢管后,喂入钢液进行还原脱磷反应的方法。试验结果表明:钢液wC=0.5%时,脱磷剂喂入法最终脱磷率为41%;钢液wC=1.9%时,脱磷剂喂入法最终脱磷率为25%,随着钢液含碳量的升高,脱磷率逐渐降低;脱磷剂采用顶加法时脱磷率均在10%以内,脱磷剂采用喂入法时脱磷效果远优于顶加法的脱磷效果;刚玉坩埚易受CaC2侵蚀,不适宜用于CaC2还原脱磷。MgO坩埚是进行还原脱磷反应的理想容器;在脱磷过程中合金元素铌不发生变化。
Abstract:
A study on reducing dephosphorization of Nb-bearing hot metal by adding CaC2 was carried out with carbon contents in the hot metal of 0.5% to 1.9%,and hot metal's temperature of 1 550℃.Effects of the amount of dephosphorizing agent added and its adding way,the carbon content in the hot melt,and the crucible material on dephosphorization rate were investigated.To improve the dynamics condition of hot metal,a new adding way that the dephosphorization agent was added into the hot metal's interior through a steel pipe was adopted according to characteristics of CaC2 decomposition.The experimental results show that as the carbon content in molten steel decreases to 0.5% from 1.9%,the dephosphorization rate increases to 41% from 25%,which indicates the dephosphorization rate decreases with the increase of carbon content in molten steel.The dephosphorization rate decreases when top feeding is used instead of embedded feeding.Since corrosion of Al2O3 refractory is found,MgO crucible instead of corundum crucible is suitable for reducing dephosphorizatin with CaC2-CaF2.The content of Nb in hot metal does not change during dephosphorization.
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