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Effect of the Fe2O3 Addition Amount on Dephosphorization of Hot Metal with Low Basicity Slag by High-Temperature Laboratorial Experiments
Metals ( IF 2.9 ) Pub Date : 2021-03-04 , DOI: 10.3390/met11030417
Wenkui Yang , Jian Yang , Yanqiu Shi , Zhijun Yang , Fubin Gao , Runhao Zhang , Han Sun

In this paper, the influence of the Fe2O3 addition amount on the dephosphorization of hot metal at 1623 K with the slag of the low basicity (CaO/SiO2) of about 1.5 was investigated by using high-temperature laboratorial experiments. With increasing the Fe2O3 addition amount from 5 to 30 g, the contents of [C], [Si], [Mn] and [P] in the hot metal at the end of dephosphorization are decreased and the corresponding removal ratios increase. In dephosphorization slags, the phosphorus mainly exists in the form of the nCa2SiO4–Ca3(PO4)2 solid solution in the phosphorus-rich phase and the value of coefficient n decreases from 20 to 1. Furthermore, the oxygen potential and activity at the interface between the slag and hot metal are increased. When the oxygen potential and the oxygen activity at the interface are greater than 0.72 × 10−12 and 7.1 × 10−3, respectively, the dephosphorization ratio begins to increase rapidly. When the Fe2O3 addition amount is increased to 30 g, the ratio of the Fe2O3 addition amount to theoretical calculation consumption is around 175%, and the dephosphorization ratio reaches the highest value of 83.3%.

中文翻译:

高温实验表明,Fe2O3添加量对低碱度渣铁水脱磷的影响

本文通过高温实验室实验研究了Fe 2 O 3的添加量对低碱度(CaO / SiO 2)约为1.5的渣在1623 K下铁水脱磷的影响。随着Fe 2 O 3的添加量从5 g增加到30 g,脱磷结束时铁水中的[C],[Si],[Mn]和[P]含量降低,相应的去除率增加。在脱磷炉渣中,磷主要以nCa 2 SiO 4 -Ca 3(PO 42的形式存在。富磷相中的固溶体,系数n的值从20降低到1。此外,炉渣与铁水之间的界面处的氧势和活性增加。当界面处的氧势和氧活性分别大于0.72×10 -12和7.1×10 -3时,脱磷率开始迅速增加。当Fe 2 O 3的添加量增加至30g时,Fe 2 O 3的添加量与理论计算消耗量的比率为约175%,并且脱磷率达到最高值83.3%。
更新日期:2021-03-04
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