CaO-SiO_2-Al_2O_3-Fe_2O_3渣系脱磷行为
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摘要
利用Factsage软件计算了Al_2O_3含量对CaO-SiO_2-Al_2O_3-Fe_2O_3四元渣系熔点和黏度的影响,并通过实验研究了在1 400℃时,CaO-SiO_2-Al_2O_3-Fe_2O_3四元渣系对高磷铁水脱磷行为的影响。结果表明:渣中Al_2O_3的质量分数在3%~6%之间时,随着Al_2O_3含量的增加,渣系的熔化温度迅速降低,进一步增加渣中的Al_2O_3含量,渣系的熔化温度逐渐增加;Al_2O_3对CaO-SiO_2-Al_2O_3-Fe_2O_3渣系的黏度影响不大;渣中Al_2O_3的质量分数在3%~6%之间变化时,渣系脱磷能力变化不是很大,脱磷率维持在91%左右,进一步增加渣系中Al_2O_3的量,脱磷率逐渐下降;Al_2O_3对脱磷率产生影响可能是其改变了炉渣中液相所占比例,进而影响磷从铁水中向液相渣的传质过程。
The effect of Al_2O_3 content on CaO-SiO_2-Al_2O_3-Fe_2O_3 slag quaternary system slag melting point and viscosity was calculated by Factsage software,and the effect of CaO-SiO_2-Al_2O_3-Fe_2O_3 slag system on the dephosphorization behavior of high phosphorus hot metal was studied by experiment at 1 400℃.The results show that when the Al_2O_3 content varies from 3%to 6%,the slag melting point decreases rapidly with the increase of Al_2O_3 content,but with further increase of Al_2O_3 content in slag,the slag melting point increases gradually.The Al_2O_3 content has little effect on the viscosity of CaO-SiO_2-Al_2O_3-Fe_2O_3 slag.When the Al_2O_3 content varied from 3%to 6%,the slag dephosphorization ability changes little,and dephosphorization rate remains at about 91%,but dephosphorization ability decreases gradually with the further increase of Al_2O_3 content.The Al_2O_3 content maybe affect the slag dephosphorization ability by changing the liquid phase proportion of slag,thereby affecting the mass transfer of phosphorus from hot metal to liquid slag.
The effect of Al_2O_3 content on CaO-SiO_2-Al_2O_3-Fe_2O_3 slag quaternary system slag melting point and viscosity was calculated by Factsage software,and the effect of CaO-SiO_2-Al_2O_3-Fe_2O_3 slag system on the dephosphorization behavior of high phosphorus hot metal was studied by experiment at 1 400℃.The results show that when the Al_2O_3 content varies from 3%to 6%,the slag melting point decreases rapidly with the increase of Al_2O_3 content,but with further increase of Al_2O_3 content in slag,the slag melting point increases gradually.The Al_2O_3 content has little effect on the viscosity of CaO-SiO_2-Al_2O_3-Fe_2O_3 slag.When the Al_2O_3 content varied from 3%to 6%,the slag dephosphorization ability changes little,and dephosphorization rate remains at about 91%,but dephosphorization ability decreases gradually with the further increase of Al_2O_3 content.The Al_2O_3 content maybe affect the slag dephosphorization ability by changing the liquid phase proportion of slag,thereby affecting the mass transfer of phosphorus from hot metal to liquid slag.
引文
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