小颗粒石灰石与石灰化渣脱磷效果试验研究

Research on the mechanism of dephosphorization by small particle limestone and liming slag

为了探究转炉喷吹小颗粒石灰石炼钢的可行性,基于化渣脱磷基础试验,对比了小颗粒石灰石与石灰在相同条件下的化渣脱磷效果,并从造渣脱磷机理上进行分析。研究表明:小颗粒石灰石在熔池内分解形成高活性石灰,可同时实现在熔池内部及界面的脱磷反应,脱磷效果与石灰相当,终点铁水脱磷率均可以达到85%以上;小颗粒石灰石比石灰的前期脱磷速率快,可以在更短的时间内将大部分磷元素脱除;小颗粒石灰石与石灰均可以实现均匀化渣,石灰石化渣渣层较高,泡沫渣更为明显,渣中元素分布均匀,磷元素主要富集在Ca_(3)(PO_(4))_(2)固溶体相中。

In order to investigate the feasibility of converter blown small particle limestone for steel making,based on the basic experiment of slag dephosphorization,the effect of small particle limestone and lime for slagging and dephosphorization under the same conditions was compared,and in-depth analysis was conducted from the mechanism of slag dephosphorization.The study shows that the small particle limestone decomposes in the molten pool to form highly active lime,which can simultaneously achieve dephosphorization reaction inside and at the interface of the molten pool.The dephosphorization effect is equivalent to that of lime,and the dephosphorization rate of the endpoint molten iron can reach over 85%.Small particle limestone has a faster rate of pre-phosphorus removal than lime,and can remove most of the phosphorus elements in a shorter time.Both small particle limestone and lime can achieve uniform slagging,limestone slagging slag layer is higher,foam slag is more obvious.The distribution of elements in slag is uniform,and phosphorus elements are mainly enriched in Ca_(3)(PO_(4))_(2)solid solution phase.