摘要:
转炉冶炼脱磷期间渣中含有一定量的固态CaO颗粒,为研究磷在CaO颗粒中的传递速度,在1385~1450℃,CaO饱和的CaO-SiO2-FetO-P2O5熔渣中用钼丝吊入CaO颗粒,分别保温10、20、30、60、100s,之后取出空冷,采用SEM-EDS测量非均相脱磷渣中磷在CaO颗粒和渣间的分配并计算扩散系数,研究了温度对磷在CaO固相颗粒中的扩散速度的影响。结果表明,在试验温度下磷能够扩散进入CaO固体颗粒中,但由于CaO颗粒与渣中物质作用,磷的进一步扩散变得困难。1400℃下磷在CaO颗粒中的扩散速率常数DP为9.536×10-10m2/s;1385、1450℃时,DP分别为5.75749×10-10、7.42×10-9m2/s。在1380~1450℃,CaO-SiO2-FetO-P2O5熔渣中磷在CaO颗粒中的扩散活化能为9.638×105J/mol。
Abstract:
There is some amount of solid particle of CaO in dephosphorizing slag of molten steel.In order to investigate the diffusion rate of phosphor in CaO particle,CaO particle suspending with wire of Mo were put into molten slag of CaO-SiO2-FetO-P2O5 at the temperature between 1 385℃ and 1 450℃,and then were taken out to cool down in the air after 10 s,20 s,30 s,60 s and 100 s of thermal insulation respectively.The distribution of phosphor in the experimental heterogeneous dephosphorizing slag between CaO particle and slag was measured by SEM-EDS and the diffusion coefficient was calculated in order to study the effect of temperature on diffusion velocity of phosphor in CaO solid particle.The result shows that at experimental temperature,phosphor can enter into CaO solid particle by diffusing,however,the further diffusing of phosphor is difficult to realize because of the reaction of CaO particle with other material in slag.The DP,diffusion velocity coefficient of phosphor in CaO solid particle,is 9.536×10-10m2/s at 1 400℃ and they are 5.757 49×10-10m2/s and 7.42×10-9m2/s respectively at 1 385℃ and 1 450℃.Between 1 380℃ and 1 450℃,the activation energy of diffusing in CaO particle of phosphor in slag of CaO-SiO2-FetO-P2O5 is 9.638×105 J/mol.
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