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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。
The use of CaC2-CaF2 niobium steel liquid reduction furnace in a carbon steel dephosphorization test, the liquid steel carbon content wC = 0.5% ~ 1.9%, the temperature of 1550 ℃. The effects of dephosphorizer adding method and amount, carbon content of hot metal and crucible material on dephosphorization rate were studied. In order to obtain good kinetic conditions, according to the characteristics of CaC2 decomposition, the dephosphorization agent is loaded into the steel pipe, and then the molten steel is fed for reduction and dephosphorization. The experimental results show that the ultimate dephosphorization rate of dephosphorization agent feeding method is 41% when wC = 0.5% and the final dephosphorization rate of dephosphatation agent feeding method is 25% when wC = 1.9% The increase of carbon content in molten steel decreased the dephosphorization rate gradually. The dephosphorization rate of dephosphorization agent was less than 10% when using the top addition method. The dephosphorization effect of dephosphorization agent was much better than that of the top addition method Effect; corundum crucible susceptible to CaC2 erosion, unsuitable for CaC2 reduction dephosphorization. The MgO crucible is the ideal container for the reductive dephosphorization reaction. The niobium alloy element does not change during dephosphorization.